Auto merge of #124208 - jieyouxu:rollup-gbgpu4u, r=jieyouxu

Rollup of 10 pull requests

Successful merges:

 - #123379 (Print note with closure signature on type mismatch)
 - #123967 (static_mut_refs: use raw pointers to remove the remaining FIXME)
 - #123976 (Use fake libc in core test)
 - #123986 (lint-docs: Add redirects for renamed lints.)
 - #124053 (coverage: Branch coverage tests for lazy boolean operators)
 - #124071 (Add llvm-bitcode-linker to build manifest)
 - #124103 (Improve std::fs::Metadata Debug representation)
 - #124132 (llvm RustWrapper: explain OpBundlesIndirect argument type)
 - #124191 (Give a name to each distinct manipulation of pretty-printer FixupContext)
 - #124196 (mir-opt tests: rename unit-test -> test-mir-pass)

r? `@ghost`
`@rustbot` modify labels: rollup

15 files changed, 1233 insertions, 0 deletions

diff --git a/tests/coverage/branch/generics.cov-map b/tests/coverage/branch/generics.cov-map
new file mode 100644
index 00000000000..d729b0c260a
--- /dev/null
+++ b/tests/coverage/branch/generics.cov-map
@@ -0,0 +1,54 @@
+Function name: generics::print_size::<()>
+Raw bytes (35): 0x[01, 01, 02, 01, 05, 05, 02, 05, 01, 06, 01, 01, 24, 20, 05, 02, 01, 08, 00, 24, 05, 00, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 2
+- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
+- expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
+Number of file 0 mappings: 5
+- Code(Counter(0)) at (prev + 6, 1) to (start + 1, 36)
+- Branch { true: Counter(1), false: Expression(0, Sub) } at (prev + 1, 8) to (start + 0, 36)
+    true  = c1
+    false = (c0 - c1)
+- Code(Counter(1)) at (prev + 0, 37) to (start + 2, 6)
+- Code(Expression(0, Sub)) at (prev + 2, 12) to (start + 2, 6)
+    = (c0 - c1)
+- Code(Expression(1, Add)) at (prev + 3, 1) to (start + 0, 2)
+    = (c1 + (c0 - c1))
+
+Function name: generics::print_size::<u32>
+Raw bytes (35): 0x[01, 01, 02, 01, 05, 05, 02, 05, 01, 06, 01, 01, 24, 20, 05, 02, 01, 08, 00, 24, 05, 00, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 2
+- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
+- expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
+Number of file 0 mappings: 5
+- Code(Counter(0)) at (prev + 6, 1) to (start + 1, 36)
+- Branch { true: Counter(1), false: Expression(0, Sub) } at (prev + 1, 8) to (start + 0, 36)
+    true  = c1
+    false = (c0 - c1)
+- Code(Counter(1)) at (prev + 0, 37) to (start + 2, 6)
+- Code(Expression(0, Sub)) at (prev + 2, 12) to (start + 2, 6)
+    = (c0 - c1)
+- Code(Expression(1, Add)) at (prev + 3, 1) to (start + 0, 2)
+    = (c1 + (c0 - c1))
+
+Function name: generics::print_size::<u64>
+Raw bytes (35): 0x[01, 01, 02, 01, 05, 05, 02, 05, 01, 06, 01, 01, 24, 20, 05, 02, 01, 08, 00, 24, 05, 00, 25, 02, 06, 02, 02, 0c, 02, 06, 07, 03, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 2
+- expression 0 operands: lhs = Counter(0), rhs = Counter(1)
+- expression 1 operands: lhs = Counter(1), rhs = Expression(0, Sub)
+Number of file 0 mappings: 5
+- Code(Counter(0)) at (prev + 6, 1) to (start + 1, 36)
+- Branch { true: Counter(1), false: Expression(0, Sub) } at (prev + 1, 8) to (start + 0, 36)
+    true  = c1
+    false = (c0 - c1)
+- Code(Counter(1)) at (prev + 0, 37) to (start + 2, 6)
+- Code(Expression(0, Sub)) at (prev + 2, 12) to (start + 2, 6)
+    = (c0 - c1)
+- Code(Expression(1, Add)) at (prev + 3, 1) to (start + 0, 2)
+    = (c1 + (c0 - c1))
+
diff --git a/tests/coverage/branch/generics.coverage b/tests/coverage/branch/generics.coverage
new file mode 100644
index 00000000000..85f73d45f65
--- /dev/null
+++ b/tests/coverage/branch/generics.coverage
@@ -0,0 +1,62 @@
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2021
+   LL|       |//@ compile-flags: -Zcoverage-options=branch
+   LL|       |//@ llvm-cov-flags: --show-branches=count
+   LL|       |
+   LL|      3|fn print_size<T>() {
+   LL|      3|    if std::mem::size_of::<T>() > 4 {
+  ------------------
+  |  Branch (LL:8): [True: 0, False: 1]
+  |  Branch (LL:8): [True: 0, False: 1]
+  |  Branch (LL:8): [True: 1, False: 0]
+  ------------------
+   LL|      1|        println!("size > 4");
+   LL|      2|    } else {
+   LL|      2|        println!("size <= 4");
+   LL|      2|    }
+   LL|      3|}
+  ------------------
+  | generics::print_size::<()>:
+  |   LL|      1|fn print_size<T>() {
+  |   LL|      1|    if std::mem::size_of::<T>() > 4 {
+  |  ------------------
+  |  |  Branch (LL:8): [True: 0, False: 1]
+  |  ------------------
+  |   LL|      0|        println!("size > 4");
+  |   LL|      1|    } else {
+  |   LL|      1|        println!("size <= 4");
+  |   LL|      1|    }
+  |   LL|      1|}
+  ------------------
+  | generics::print_size::<u32>:
+  |   LL|      1|fn print_size<T>() {
+  |   LL|      1|    if std::mem::size_of::<T>() > 4 {
+  |  ------------------
+  |  |  Branch (LL:8): [True: 0, False: 1]
+  |  ------------------
+  |   LL|      0|        println!("size > 4");
+  |   LL|      1|    } else {
+  |   LL|      1|        println!("size <= 4");
+  |   LL|      1|    }
+  |   LL|      1|}
+  ------------------
+  | generics::print_size::<u64>:
+  |   LL|      1|fn print_size<T>() {
+  |   LL|      1|    if std::mem::size_of::<T>() > 4 {
+  |  ------------------
+  |  |  Branch (LL:8): [True: 1, False: 0]
+  |  ------------------
+  |   LL|      1|        println!("size > 4");
+  |   LL|      1|    } else {
+  |   LL|      0|        println!("size <= 4");
+  |   LL|      0|    }
+  |   LL|      1|}
+  ------------------
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    print_size::<()>();
+   LL|       |    print_size::<u32>();
+   LL|       |    print_size::<u64>();
+   LL|       |}
+
diff --git a/tests/coverage/branch/generics.rs b/tests/coverage/branch/generics.rs
new file mode 100644
index 00000000000..d870ace7006
--- /dev/null
+++ b/tests/coverage/branch/generics.rs
@@ -0,0 +1,19 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+//@ compile-flags: -Zcoverage-options=branch
+//@ llvm-cov-flags: --show-branches=count
+
+fn print_size<T>() {
+    if std::mem::size_of::<T>() > 4 {
+        println!("size > 4");
+    } else {
+        println!("size <= 4");
+    }
+}
+
+#[coverage(off)]
+fn main() {
+    print_size::<()>();
+    print_size::<u32>();
+    print_size::<u64>();
+}
diff --git a/tests/coverage/branch/guard.cov-map b/tests/coverage/branch/guard.cov-map
new file mode 100644
index 00000000000..d67c3d349a1
--- /dev/null
+++ b/tests/coverage/branch/guard.cov-map
@@ -0,0 +1,32 @@
+Function name: guard::branch_match_guard
+Raw bytes (85): 0x[01, 01, 06, 19, 0d, 05, 09, 0f, 15, 13, 11, 17, 0d, 05, 09, 0d, 01, 0c, 01, 01, 10, 1d, 03, 0b, 00, 0c, 15, 01, 14, 02, 0a, 0d, 03, 0e, 00, 0f, 19, 00, 14, 00, 19, 20, 0d, 02, 00, 14, 00, 1e, 0d, 00, 1d, 02, 0a, 11, 03, 0e, 00, 0f, 1d, 00, 14, 00, 19, 20, 11, 09, 00, 14, 00, 1e, 11, 00, 1d, 02, 0a, 17, 03, 0e, 02, 0a, 0b, 04, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 6
+- expression 0 operands: lhs = Counter(6), rhs = Counter(3)
+- expression 1 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 2 operands: lhs = Expression(3, Add), rhs = Counter(5)
+- expression 3 operands: lhs = Expression(4, Add), rhs = Counter(4)
+- expression 4 operands: lhs = Expression(5, Add), rhs = Counter(3)
+- expression 5 operands: lhs = Counter(1), rhs = Counter(2)
+Number of file 0 mappings: 13
+- Code(Counter(0)) at (prev + 12, 1) to (start + 1, 16)
+- Code(Counter(7)) at (prev + 3, 11) to (start + 0, 12)
+- Code(Counter(5)) at (prev + 1, 20) to (start + 2, 10)
+- Code(Counter(3)) at (prev + 3, 14) to (start + 0, 15)
+- Code(Counter(6)) at (prev + 0, 20) to (start + 0, 25)
+- Branch { true: Counter(3), false: Expression(0, Sub) } at (prev + 0, 20) to (start + 0, 30)
+    true  = c3
+    false = (c6 - c3)
+- Code(Counter(3)) at (prev + 0, 29) to (start + 2, 10)
+- Code(Counter(4)) at (prev + 3, 14) to (start + 0, 15)
+- Code(Counter(7)) at (prev + 0, 20) to (start + 0, 25)
+- Branch { true: Counter(4), false: Counter(2) } at (prev + 0, 20) to (start + 0, 30)
+    true  = c4
+    false = c2
+- Code(Counter(4)) at (prev + 0, 29) to (start + 2, 10)
+- Code(Expression(5, Add)) at (prev + 3, 14) to (start + 2, 10)
+    = (c1 + c2)
+- Code(Expression(2, Add)) at (prev + 4, 1) to (start + 0, 2)
+    = ((((c1 + c2) + c3) + c4) + c5)
+
diff --git a/tests/coverage/branch/guard.coverage b/tests/coverage/branch/guard.coverage
new file mode 100644
index 00000000000..f89b965b5d0
--- /dev/null
+++ b/tests/coverage/branch/guard.coverage
@@ -0,0 +1,45 @@
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2021
+   LL|       |//@ compile-flags: -Zcoverage-options=branch
+   LL|       |//@ llvm-cov-flags: --show-branches=count
+   LL|       |
+   LL|       |macro_rules! no_merge {
+   LL|       |    () => {
+   LL|       |        for _ in 0..1 {}
+   LL|       |    };
+   LL|       |}
+   LL|       |
+   LL|      4|fn branch_match_guard(x: Option<u32>) {
+   LL|      4|    no_merge!();
+   LL|       |
+   LL|      1|    match x {
+   LL|      1|        Some(0) => {
+   LL|      1|            println!("zero");
+   LL|      1|        }
+   LL|      3|        Some(x) if x % 2 == 0 => {
+                           ^2
+  ------------------
+  |  Branch (LL:20): [True: 2, False: 1]
+  ------------------
+   LL|      2|            println!("is nonzero and even");
+   LL|      2|        }
+   LL|      1|        Some(x) if x % 3 == 0 => {
+  ------------------
+  |  Branch (LL:20): [True: 1, False: 0]
+  ------------------
+   LL|      1|            println!("is nonzero and odd, but divisible by 3");
+   LL|      1|        }
+   LL|      0|        _ => {
+   LL|      0|            println!("something else");
+   LL|      0|        }
+   LL|       |    }
+   LL|      4|}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    branch_match_guard(Some(0));
+   LL|       |    branch_match_guard(Some(2));
+   LL|       |    branch_match_guard(Some(6));
+   LL|       |    branch_match_guard(Some(3));
+   LL|       |}
+
diff --git a/tests/coverage/branch/guard.rs b/tests/coverage/branch/guard.rs
new file mode 100644
index 00000000000..fa049e6206d
--- /dev/null
+++ b/tests/coverage/branch/guard.rs
@@ -0,0 +1,37 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+//@ compile-flags: -Zcoverage-options=branch
+//@ llvm-cov-flags: --show-branches=count
+
+macro_rules! no_merge {
+    () => {
+        for _ in 0..1 {}
+    };
+}
+
+fn branch_match_guard(x: Option<u32>) {
+    no_merge!();
+
+    match x {
+        Some(0) => {
+            println!("zero");
+        }
+        Some(x) if x % 2 == 0 => {
+            println!("is nonzero and even");
+        }
+        Some(x) if x % 3 == 0 => {
+            println!("is nonzero and odd, but divisible by 3");
+        }
+        _ => {
+            println!("something else");
+        }
+    }
+}
+
+#[coverage(off)]
+fn main() {
+    branch_match_guard(Some(0));
+    branch_match_guard(Some(2));
+    branch_match_guard(Some(6));
+    branch_match_guard(Some(3));
+}
diff --git a/tests/coverage/branch/if.cov-map b/tests/coverage/branch/if.cov-map
new file mode 100644
index 00000000000..50f6216e069
--- /dev/null
+++ b/tests/coverage/branch/if.cov-map
@@ -0,0 +1,188 @@
+Function name: if::branch_and
+Raw bytes (56): 0x[01, 01, 04, 05, 09, 0d, 02, 11, 0f, 0d, 02, 08, 01, 2b, 01, 01, 10, 05, 03, 08, 00, 09, 20, 09, 02, 00, 08, 00, 09, 09, 00, 0d, 00, 0e, 20, 11, 0d, 00, 0d, 00, 0e, 11, 00, 0f, 02, 06, 0f, 02, 0c, 02, 06, 0b, 03, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 4
+- expression 0 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 1 operands: lhs = Counter(3), rhs = Expression(0, Sub)
+- expression 2 operands: lhs = Counter(4), rhs = Expression(3, Add)
+- expression 3 operands: lhs = Counter(3), rhs = Expression(0, Sub)
+Number of file 0 mappings: 8
+- Code(Counter(0)) at (prev + 43, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 8) to (start + 0, 9)
+- Branch { true: Counter(2), false: Expression(0, Sub) } at (prev + 0, 8) to (start + 0, 9)
+    true  = c2
+    false = (c1 - c2)
+- Code(Counter(2)) at (prev + 0, 13) to (start + 0, 14)
+- Branch { true: Counter(4), false: Counter(3) } at (prev + 0, 13) to (start + 0, 14)
+    true  = c4
+    false = c3
+- Code(Counter(4)) at (prev + 0, 15) to (start + 2, 6)
+- Code(Expression(3, Add)) at (prev + 2, 12) to (start + 2, 6)
+    = (c3 + (c1 - c2))
+- Code(Expression(2, Add)) at (prev + 3, 1) to (start + 0, 2)
+    = (c4 + (c3 + (c1 - c2)))
+
+Function name: if::branch_not
+Raw bytes (224): 0x[01, 01, 29, 05, 09, 09, 02, a3, 01, 0d, 09, 02, a3, 01, 0d, 09, 02, 0d, 9e, 01, a3, 01, 0d, 09, 02, 9b, 01, 11, 0d, 9e, 01, a3, 01, 0d, 09, 02, 9b, 01, 11, 0d, 9e, 01, a3, 01, 0d, 09, 02, 11, 96, 01, 9b, 01, 11, 0d, 9e, 01, a3, 01, 0d, 09, 02, 93, 01, 15, 11, 96, 01, 9b, 01, 11, 0d, 9e, 01, a3, 01, 0d, 09, 02, 93, 01, 15, 11, 96, 01, 9b, 01, 11, 0d, 9e, 01, a3, 01, 0d, 09, 02, 15, 8e, 01, 93, 01, 15, 11, 96, 01, 9b, 01, 11, 0d, 9e, 01, a3, 01, 0d, 09, 02, 12, 01, 0c, 01, 01, 10, 05, 03, 08, 00, 09, 20, 09, 02, 00, 08, 00, 09, 09, 01, 09, 00, 11, 02, 01, 06, 00, 07, a3, 01, 01, 08, 00, 0a, 20, 9e, 01, 0d, 00, 08, 00, 0a, 9e, 01, 00, 0b, 02, 06, 0d, 02, 06, 00, 07, 9b, 01, 01, 08, 00, 0b, 20, 11, 96, 01, 00, 08, 00, 0b, 11, 00, 0c, 02, 06, 96, 01, 02, 06, 00, 07, 93, 01, 01, 08, 00, 0c, 20, 8e, 01, 15, 00, 08, 00, 0c, 8e, 01, 00, 0d, 02, 06, 15, 02, 06, 00, 07, 8b, 01, 01, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 41
+- expression 0 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 1 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 2 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 3 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 4 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 5 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 6 operands: lhs = Counter(3), rhs = Expression(39, Sub)
+- expression 7 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 8 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 9 operands: lhs = Expression(38, Add), rhs = Counter(4)
+- expression 10 operands: lhs = Counter(3), rhs = Expression(39, Sub)
+- expression 11 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 12 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 13 operands: lhs = Expression(38, Add), rhs = Counter(4)
+- expression 14 operands: lhs = Counter(3), rhs = Expression(39, Sub)
+- expression 15 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 16 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 17 operands: lhs = Counter(4), rhs = Expression(37, Sub)
+- expression 18 operands: lhs = Expression(38, Add), rhs = Counter(4)
+- expression 19 operands: lhs = Counter(3), rhs = Expression(39, Sub)
+- expression 20 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 21 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 22 operands: lhs = Expression(36, Add), rhs = Counter(5)
+- expression 23 operands: lhs = Counter(4), rhs = Expression(37, Sub)
+- expression 24 operands: lhs = Expression(38, Add), rhs = Counter(4)
+- expression 25 operands: lhs = Counter(3), rhs = Expression(39, Sub)
+- expression 26 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 27 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 28 operands: lhs = Expression(36, Add), rhs = Counter(5)
+- expression 29 operands: lhs = Counter(4), rhs = Expression(37, Sub)
+- expression 30 operands: lhs = Expression(38, Add), rhs = Counter(4)
+- expression 31 operands: lhs = Counter(3), rhs = Expression(39, Sub)
+- expression 32 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 33 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 34 operands: lhs = Counter(5), rhs = Expression(35, Sub)
+- expression 35 operands: lhs = Expression(36, Add), rhs = Counter(5)
+- expression 36 operands: lhs = Counter(4), rhs = Expression(37, Sub)
+- expression 37 operands: lhs = Expression(38, Add), rhs = Counter(4)
+- expression 38 operands: lhs = Counter(3), rhs = Expression(39, Sub)
+- expression 39 operands: lhs = Expression(40, Add), rhs = Counter(3)
+- expression 40 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+Number of file 0 mappings: 18
+- Code(Counter(0)) at (prev + 12, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 8) to (start + 0, 9)
+- Branch { true: Counter(2), false: Expression(0, Sub) } at (prev + 0, 8) to (start + 0, 9)
+    true  = c2
+    false = (c1 - c2)
+- Code(Counter(2)) at (prev + 1, 9) to (start + 0, 17)
+- Code(Expression(0, Sub)) at (prev + 1, 6) to (start + 0, 7)
+    = (c1 - c2)
+- Code(Expression(40, Add)) at (prev + 1, 8) to (start + 0, 10)
+    = (c2 + (c1 - c2))
+- Branch { true: Expression(39, Sub), false: Counter(3) } at (prev + 0, 8) to (start + 0, 10)
+    true  = ((c2 + (c1 - c2)) - c3)
+    false = c3
+- Code(Expression(39, Sub)) at (prev + 0, 11) to (start + 2, 6)
+    = ((c2 + (c1 - c2)) - c3)
+- Code(Counter(3)) at (prev + 2, 6) to (start + 0, 7)
+- Code(Expression(38, Add)) at (prev + 1, 8) to (start + 0, 11)
+    = (c3 + ((c2 + (c1 - c2)) - c3))
+- Branch { true: Counter(4), false: Expression(37, Sub) } at (prev + 0, 8) to (start + 0, 11)
+    true  = c4
+    false = ((c3 + ((c2 + (c1 - c2)) - c3)) - c4)
+- Code(Counter(4)) at (prev + 0, 12) to (start + 2, 6)
+- Code(Expression(37, Sub)) at (prev + 2, 6) to (start + 0, 7)
+    = ((c3 + ((c2 + (c1 - c2)) - c3)) - c4)
+- Code(Expression(36, Add)) at (prev + 1, 8) to (start + 0, 12)
+    = (c4 + ((c3 + ((c2 + (c1 - c2)) - c3)) - c4))
+- Branch { true: Expression(35, Sub), false: Counter(5) } at (prev + 0, 8) to (start + 0, 12)
+    true  = ((c4 + ((c3 + ((c2 + (c1 - c2)) - c3)) - c4)) - c5)
+    false = c5
+- Code(Expression(35, Sub)) at (prev + 0, 13) to (start + 2, 6)
+    = ((c4 + ((c3 + ((c2 + (c1 - c2)) - c3)) - c4)) - c5)
+- Code(Counter(5)) at (prev + 2, 6) to (start + 0, 7)
+- Code(Expression(34, Add)) at (prev + 1, 1) to (start + 0, 2)
+    = (c5 + ((c4 + ((c3 + ((c2 + (c1 - c2)) - c3)) - c4)) - c5))
+
+Function name: if::branch_not_as
+Raw bytes (124): 0x[01, 01, 16, 05, 09, 09, 02, 57, 0d, 09, 02, 57, 0d, 09, 02, 0d, 52, 57, 0d, 09, 02, 4f, 11, 0d, 52, 57, 0d, 09, 02, 4f, 11, 0d, 52, 57, 0d, 09, 02, 11, 4a, 4f, 11, 0d, 52, 57, 0d, 09, 02, 0e, 01, 1d, 01, 01, 10, 05, 03, 08, 00, 14, 20, 02, 09, 00, 08, 00, 14, 02, 00, 15, 02, 06, 09, 02, 06, 00, 07, 57, 01, 08, 00, 15, 20, 0d, 52, 00, 08, 00, 15, 0d, 00, 16, 02, 06, 52, 02, 06, 00, 07, 4f, 01, 08, 00, 16, 20, 4a, 11, 00, 08, 00, 16, 4a, 00, 17, 02, 06, 11, 02, 06, 00, 07, 47, 01, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 22
+- expression 0 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 1 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 2 operands: lhs = Expression(21, Add), rhs = Counter(3)
+- expression 3 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 4 operands: lhs = Expression(21, Add), rhs = Counter(3)
+- expression 5 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 6 operands: lhs = Counter(3), rhs = Expression(20, Sub)
+- expression 7 operands: lhs = Expression(21, Add), rhs = Counter(3)
+- expression 8 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 9 operands: lhs = Expression(19, Add), rhs = Counter(4)
+- expression 10 operands: lhs = Counter(3), rhs = Expression(20, Sub)
+- expression 11 operands: lhs = Expression(21, Add), rhs = Counter(3)
+- expression 12 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 13 operands: lhs = Expression(19, Add), rhs = Counter(4)
+- expression 14 operands: lhs = Counter(3), rhs = Expression(20, Sub)
+- expression 15 operands: lhs = Expression(21, Add), rhs = Counter(3)
+- expression 16 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+- expression 17 operands: lhs = Counter(4), rhs = Expression(18, Sub)
+- expression 18 operands: lhs = Expression(19, Add), rhs = Counter(4)
+- expression 19 operands: lhs = Counter(3), rhs = Expression(20, Sub)
+- expression 20 operands: lhs = Expression(21, Add), rhs = Counter(3)
+- expression 21 operands: lhs = Counter(2), rhs = Expression(0, Sub)
+Number of file 0 mappings: 14
+- Code(Counter(0)) at (prev + 29, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 8) to (start + 0, 20)
+- Branch { true: Expression(0, Sub), false: Counter(2) } at (prev + 0, 8) to (start + 0, 20)
+    true  = (c1 - c2)
+    false = c2
+- Code(Expression(0, Sub)) at (prev + 0, 21) to (start + 2, 6)
+    = (c1 - c2)
+- Code(Counter(2)) at (prev + 2, 6) to (start + 0, 7)
+- Code(Expression(21, Add)) at (prev + 1, 8) to (start + 0, 21)
+    = (c2 + (c1 - c2))
+- Branch { true: Counter(3), false: Expression(20, Sub) } at (prev + 0, 8) to (start + 0, 21)
+    true  = c3
+    false = ((c2 + (c1 - c2)) - c3)
+- Code(Counter(3)) at (prev + 0, 22) to (start + 2, 6)
+- Code(Expression(20, Sub)) at (prev + 2, 6) to (start + 0, 7)
+    = ((c2 + (c1 - c2)) - c3)
+- Code(Expression(19, Add)) at (prev + 1, 8) to (start + 0, 22)
+    = (c3 + ((c2 + (c1 - c2)) - c3))
+- Branch { true: Expression(18, Sub), false: Counter(4) } at (prev + 0, 8) to (start + 0, 22)
+    true  = ((c3 + ((c2 + (c1 - c2)) - c3)) - c4)
+    false = c4
+- Code(Expression(18, Sub)) at (prev + 0, 23) to (start + 2, 6)
+    = ((c3 + ((c2 + (c1 - c2)) - c3)) - c4)
+- Code(Counter(4)) at (prev + 2, 6) to (start + 0, 7)
+- Code(Expression(17, Add)) at (prev + 1, 1) to (start + 0, 2)
+    = (c4 + ((c3 + ((c2 + (c1 - c2)) - c3)) - c4))
+
+Function name: if::branch_or
+Raw bytes (56): 0x[01, 01, 04, 05, 09, 09, 0d, 0f, 11, 09, 0d, 08, 01, 35, 01, 01, 10, 05, 03, 08, 00, 09, 20, 09, 02, 00, 08, 00, 09, 02, 00, 0d, 00, 0e, 20, 0d, 11, 00, 0d, 00, 0e, 0f, 00, 0f, 02, 06, 11, 02, 0c, 02, 06, 0b, 03, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 4
+- expression 0 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 1 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 2 operands: lhs = Expression(3, Add), rhs = Counter(4)
+- expression 3 operands: lhs = Counter(2), rhs = Counter(3)
+Number of file 0 mappings: 8
+- Code(Counter(0)) at (prev + 53, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 8) to (start + 0, 9)
+- Branch { true: Counter(2), false: Expression(0, Sub) } at (prev + 0, 8) to (start + 0, 9)
+    true  = c2
+    false = (c1 - c2)
+- Code(Expression(0, Sub)) at (prev + 0, 13) to (start + 0, 14)
+    = (c1 - c2)
+- Branch { true: Counter(3), false: Counter(4) } at (prev + 0, 13) to (start + 0, 14)
+    true  = c3
+    false = c4
+- Code(Expression(3, Add)) at (prev + 0, 15) to (start + 2, 6)
+    = (c2 + c3)
+- Code(Counter(4)) at (prev + 2, 12) to (start + 2, 6)
+- Code(Expression(2, Add)) at (prev + 3, 1) to (start + 0, 2)
+    = ((c2 + c3) + c4)
+
diff --git a/tests/coverage/branch/if.coverage b/tests/coverage/branch/if.coverage
new file mode 100644
index 00000000000..2a9a408b16a
--- /dev/null
+++ b/tests/coverage/branch/if.coverage
@@ -0,0 +1,115 @@
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2021
+   LL|       |//@ compile-flags: -Zcoverage-options=branch
+   LL|       |//@ llvm-cov-flags: --show-branches=count
+   LL|       |
+   LL|       |macro_rules! no_merge {
+   LL|       |    () => {
+   LL|       |        for _ in 0..1 {}
+   LL|       |    };
+   LL|       |}
+   LL|       |
+   LL|      3|fn branch_not(a: bool) {
+   LL|      3|    no_merge!();
+   LL|       |
+   LL|      3|    if a {
+  ------------------
+  |  Branch (LL:8): [True: 2, False: 1]
+  ------------------
+   LL|      2|        say("a")
+   LL|      1|    }
+   LL|      3|    if !a {
+  ------------------
+  |  Branch (LL:8): [True: 1, False: 2]
+  ------------------
+   LL|      1|        say("not a");
+   LL|      2|    }
+   LL|      3|    if !!a {
+  ------------------
+  |  Branch (LL:8): [True: 2, False: 1]
+  ------------------
+   LL|      2|        say("not not a");
+   LL|      2|    }
+                   ^1
+   LL|      3|    if !!!a {
+  ------------------
+  |  Branch (LL:8): [True: 1, False: 2]
+  ------------------
+   LL|      1|        say("not not not a");
+   LL|      2|    }
+   LL|      3|}
+   LL|       |
+   LL|      3|fn branch_not_as(a: bool) {
+   LL|      3|    no_merge!();
+   LL|       |
+   LL|      3|    if !(a as bool) {
+  ------------------
+  |  Branch (LL:8): [True: 1, False: 2]
+  ------------------
+   LL|      1|        say("not (a as bool)");
+   LL|      2|    }
+   LL|      3|    if !!(a as bool) {
+  ------------------
+  |  Branch (LL:8): [True: 2, False: 1]
+  ------------------
+   LL|      2|        say("not not (a as bool)");
+   LL|      2|    }
+                   ^1
+   LL|      3|    if !!!(a as bool) {
+  ------------------
+  |  Branch (LL:8): [True: 1, False: 2]
+  ------------------
+   LL|      1|        say("not not (a as bool)");
+   LL|      2|    }
+   LL|      3|}
+   LL|       |
+   LL|     15|fn branch_and(a: bool, b: bool) {
+   LL|     15|    no_merge!();
+   LL|       |
+   LL|     15|    if a && b {
+                          ^12
+  ------------------
+  |  Branch (LL:8): [True: 12, False: 3]
+  |  Branch (LL:13): [True: 8, False: 4]
+  ------------------
+   LL|      8|        say("both");
+   LL|      8|    } else {
+   LL|      7|        say("not both");
+   LL|      7|    }
+   LL|     15|}
+   LL|       |
+   LL|     15|fn branch_or(a: bool, b: bool) {
+   LL|     15|    no_merge!();
+   LL|       |
+   LL|     15|    if a || b {
+                          ^3
+  ------------------
+  |  Branch (LL:8): [True: 12, False: 3]
+  |  Branch (LL:13): [True: 2, False: 1]
+  ------------------
+   LL|     14|        say("either");
+   LL|     14|    } else {
+   LL|      1|        say("neither");
+   LL|      1|    }
+   LL|     15|}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn say(message: &str) {
+   LL|       |    core::hint::black_box(message);
+   LL|       |}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    for a in [false, true, true] {
+   LL|       |        branch_not(a);
+   LL|       |        branch_not_as(a);
+   LL|       |    }
+   LL|       |
+   LL|       |    for a in [false, true, true, true, true] {
+   LL|       |        for b in [false, true, true] {
+   LL|       |            branch_and(a, b);
+   LL|       |            branch_or(a, b);
+   LL|       |        }
+   LL|       |    }
+   LL|       |}
+
diff --git a/tests/coverage/branch/if.rs b/tests/coverage/branch/if.rs
new file mode 100644
index 00000000000..151eede75bb
--- /dev/null
+++ b/tests/coverage/branch/if.rs
@@ -0,0 +1,81 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+//@ compile-flags: -Zcoverage-options=branch
+//@ llvm-cov-flags: --show-branches=count
+
+macro_rules! no_merge {
+    () => {
+        for _ in 0..1 {}
+    };
+}
+
+fn branch_not(a: bool) {
+    no_merge!();
+
+    if a {
+        say("a")
+    }
+    if !a {
+        say("not a");
+    }
+    if !!a {
+        say("not not a");
+    }
+    if !!!a {
+        say("not not not a");
+    }
+}
+
+fn branch_not_as(a: bool) {
+    no_merge!();
+
+    if !(a as bool) {
+        say("not (a as bool)");
+    }
+    if !!(a as bool) {
+        say("not not (a as bool)");
+    }
+    if !!!(a as bool) {
+        say("not not (a as bool)");
+    }
+}
+
+fn branch_and(a: bool, b: bool) {
+    no_merge!();
+
+    if a && b {
+        say("both");
+    } else {
+        say("not both");
+    }
+}
+
+fn branch_or(a: bool, b: bool) {
+    no_merge!();
+
+    if a || b {
+        say("either");
+    } else {
+        say("neither");
+    }
+}
+
+#[coverage(off)]
+fn say(message: &str) {
+    core::hint::black_box(message);
+}
+
+#[coverage(off)]
+fn main() {
+    for a in [false, true, true] {
+        branch_not(a);
+        branch_not_as(a);
+    }
+
+    for a in [false, true, true, true, true] {
+        for b in [false, true, true] {
+            branch_and(a, b);
+            branch_or(a, b);
+        }
+    }
+}
diff --git a/tests/coverage/branch/lazy-boolean.cov-map b/tests/coverage/branch/lazy-boolean.cov-map
new file mode 100644
index 00000000000..e2d731022d7
--- /dev/null
+++ b/tests/coverage/branch/lazy-boolean.cov-map
@@ -0,0 +1,177 @@
+Function name: lazy_boolean::branch_and
+Raw bytes (42): 0x[01, 01, 03, 09, 0a, 05, 09, 05, 09, 06, 01, 13, 01, 01, 10, 03, 04, 09, 00, 0a, 05, 00, 0d, 00, 0e, 20, 09, 0a, 00, 0d, 00, 0e, 09, 00, 12, 00, 13, 03, 01, 05, 01, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 3
+- expression 0 operands: lhs = Counter(2), rhs = Expression(2, Sub)
+- expression 1 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 2 operands: lhs = Counter(1), rhs = Counter(2)
+Number of file 0 mappings: 6
+- Code(Counter(0)) at (prev + 19, 1) to (start + 1, 16)
+- Code(Expression(0, Add)) at (prev + 4, 9) to (start + 0, 10)
+    = (c2 + (c1 - c2))
+- Code(Counter(1)) at (prev + 0, 13) to (start + 0, 14)
+- Branch { true: Counter(2), false: Expression(2, Sub) } at (prev + 0, 13) to (start + 0, 14)
+    true  = c2
+    false = (c1 - c2)
+- Code(Counter(2)) at (prev + 0, 18) to (start + 0, 19)
+- Code(Expression(0, Add)) at (prev + 1, 5) to (start + 1, 2)
+    = (c2 + (c1 - c2))
+
+Function name: lazy_boolean::branch_or
+Raw bytes (44): 0x[01, 01, 04, 09, 0e, 05, 09, 05, 09, 05, 09, 06, 01, 1b, 01, 01, 10, 03, 04, 09, 00, 0a, 05, 00, 0d, 00, 0e, 20, 09, 0e, 00, 0d, 00, 0e, 0e, 00, 12, 00, 13, 03, 01, 05, 01, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 4
+- expression 0 operands: lhs = Counter(2), rhs = Expression(3, Sub)
+- expression 1 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 2 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 3 operands: lhs = Counter(1), rhs = Counter(2)
+Number of file 0 mappings: 6
+- Code(Counter(0)) at (prev + 27, 1) to (start + 1, 16)
+- Code(Expression(0, Add)) at (prev + 4, 9) to (start + 0, 10)
+    = (c2 + (c1 - c2))
+- Code(Counter(1)) at (prev + 0, 13) to (start + 0, 14)
+- Branch { true: Counter(2), false: Expression(3, Sub) } at (prev + 0, 13) to (start + 0, 14)
+    true  = c2
+    false = (c1 - c2)
+- Code(Expression(3, Sub)) at (prev + 0, 18) to (start + 0, 19)
+    = (c1 - c2)
+- Code(Expression(0, Add)) at (prev + 1, 5) to (start + 1, 2)
+    = (c2 + (c1 - c2))
+
+Function name: lazy_boolean::chain
+Raw bytes (149): 0x[01, 01, 13, 11, 07, 0b, 16, 15, 1a, 09, 0d, 05, 09, 05, 09, 09, 0d, 47, 25, 4b, 21, 19, 1d, 03, 19, 03, 19, 3e, 1d, 03, 19, 3e, 1d, 03, 19, 47, 25, 4b, 21, 19, 1d, 13, 01, 24, 01, 01, 10, 03, 04, 09, 00, 0a, 05, 00, 0d, 00, 12, 20, 09, 16, 00, 0d, 00, 12, 09, 00, 16, 00, 1b, 20, 0d, 1a, 00, 16, 00, 1b, 0d, 00, 1f, 00, 24, 20, 11, 15, 00, 1f, 00, 24, 11, 00, 28, 00, 2d, 03, 01, 05, 00, 11, 43, 03, 09, 00, 0a, 03, 00, 0d, 00, 12, 20, 19, 3e, 00, 0d, 00, 12, 3e, 00, 16, 00, 1b, 20, 1d, 3a, 00, 16, 00, 1b, 3a, 00, 1f, 00, 24, 20, 21, 25, 00, 1f, 00, 24, 25, 00, 28, 00, 2d, 43, 01, 05, 01, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 19
+- expression 0 operands: lhs = Counter(4), rhs = Expression(1, Add)
+- expression 1 operands: lhs = Expression(2, Add), rhs = Expression(5, Sub)
+- expression 2 operands: lhs = Counter(5), rhs = Expression(6, Sub)
+- expression 3 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 4 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 5 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 6 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 7 operands: lhs = Expression(17, Add), rhs = Counter(9)
+- expression 8 operands: lhs = Expression(18, Add), rhs = Counter(8)
+- expression 9 operands: lhs = Counter(6), rhs = Counter(7)
+- expression 10 operands: lhs = Expression(0, Add), rhs = Counter(6)
+- expression 11 operands: lhs = Expression(0, Add), rhs = Counter(6)
+- expression 12 operands: lhs = Expression(15, Sub), rhs = Counter(7)
+- expression 13 operands: lhs = Expression(0, Add), rhs = Counter(6)
+- expression 14 operands: lhs = Expression(15, Sub), rhs = Counter(7)
+- expression 15 operands: lhs = Expression(0, Add), rhs = Counter(6)
+- expression 16 operands: lhs = Expression(17, Add), rhs = Counter(9)
+- expression 17 operands: lhs = Expression(18, Add), rhs = Counter(8)
+- expression 18 operands: lhs = Counter(6), rhs = Counter(7)
+Number of file 0 mappings: 19
+- Code(Counter(0)) at (prev + 36, 1) to (start + 1, 16)
+- Code(Expression(0, Add)) at (prev + 4, 9) to (start + 0, 10)
+    = (c4 + ((c5 + (c2 - c3)) + (c1 - c2)))
+- Code(Counter(1)) at (prev + 0, 13) to (start + 0, 18)
+- Branch { true: Counter(2), false: Expression(5, Sub) } at (prev + 0, 13) to (start + 0, 18)
+    true  = c2
+    false = (c1 - c2)
+- Code(Counter(2)) at (prev + 0, 22) to (start + 0, 27)
+- Branch { true: Counter(3), false: Expression(6, Sub) } at (prev + 0, 22) to (start + 0, 27)
+    true  = c3
+    false = (c2 - c3)
+- Code(Counter(3)) at (prev + 0, 31) to (start + 0, 36)
+- Branch { true: Counter(4), false: Counter(5) } at (prev + 0, 31) to (start + 0, 36)
+    true  = c4
+    false = c5
+- Code(Counter(4)) at (prev + 0, 40) to (start + 0, 45)
+- Code(Expression(0, Add)) at (prev + 1, 5) to (start + 0, 17)
+    = (c4 + ((c5 + (c2 - c3)) + (c1 - c2)))
+- Code(Expression(16, Add)) at (prev + 3, 9) to (start + 0, 10)
+    = (((c6 + c7) + c8) + c9)
+- Code(Expression(0, Add)) at (prev + 0, 13) to (start + 0, 18)
+    = (c4 + ((c5 + (c2 - c3)) + (c1 - c2)))
+- Branch { true: Counter(6), false: Expression(15, Sub) } at (prev + 0, 13) to (start + 0, 18)
+    true  = c6
+    false = ((c4 + ((c5 + (c2 - c3)) + (c1 - c2))) - c6)
+- Code(Expression(15, Sub)) at (prev + 0, 22) to (start + 0, 27)
+    = ((c4 + ((c5 + (c2 - c3)) + (c1 - c2))) - c6)
+- Branch { true: Counter(7), false: Expression(14, Sub) } at (prev + 0, 22) to (start + 0, 27)
+    true  = c7
+    false = (((c4 + ((c5 + (c2 - c3)) + (c1 - c2))) - c6) - c7)
+- Code(Expression(14, Sub)) at (prev + 0, 31) to (start + 0, 36)
+    = (((c4 + ((c5 + (c2 - c3)) + (c1 - c2))) - c6) - c7)
+- Branch { true: Counter(8), false: Counter(9) } at (prev + 0, 31) to (start + 0, 36)
+    true  = c8
+    false = c9
+- Code(Counter(9)) at (prev + 0, 40) to (start + 0, 45)
+- Code(Expression(16, Add)) at (prev + 1, 5) to (start + 1, 2)
+    = (((c6 + c7) + c8) + c9)
+
+Function name: lazy_boolean::nested_mixed
+Raw bytes (159): 0x[01, 01, 18, 07, 22, 11, 36, 3b, 11, 09, 0d, 26, 0d, 05, 09, 05, 09, 05, 09, 26, 0d, 05, 09, 09, 0d, 3b, 11, 09, 0d, 3b, 11, 09, 0d, 19, 5f, 1d, 21, 03, 15, 15, 19, 52, 56, 15, 19, 03, 15, 19, 5f, 1d, 21, 13, 01, 31, 01, 01, 10, 03, 04, 09, 00, 0a, 05, 00, 0e, 00, 13, 20, 09, 26, 00, 0e, 00, 13, 26, 00, 17, 00, 1d, 20, 0d, 22, 00, 17, 00, 1d, 3b, 00, 23, 00, 28, 20, 11, 36, 00, 23, 00, 28, 36, 00, 2c, 00, 33, 03, 01, 05, 00, 11, 5b, 03, 09, 00, 0a, 03, 00, 0e, 00, 13, 20, 15, 56, 00, 0e, 00, 13, 15, 00, 17, 00, 1c, 20, 19, 52, 00, 17, 00, 1c, 4f, 00, 22, 00, 28, 20, 1d, 21, 00, 22, 00, 28, 1d, 00, 2c, 00, 33, 5b, 01, 05, 01, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 24
+- expression 0 operands: lhs = Expression(1, Add), rhs = Expression(8, Sub)
+- expression 1 operands: lhs = Counter(4), rhs = Expression(13, Sub)
+- expression 2 operands: lhs = Expression(14, Add), rhs = Counter(4)
+- expression 3 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 4 operands: lhs = Expression(9, Sub), rhs = Counter(3)
+- expression 5 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 6 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 7 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 8 operands: lhs = Expression(9, Sub), rhs = Counter(3)
+- expression 9 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 10 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 11 operands: lhs = Expression(14, Add), rhs = Counter(4)
+- expression 12 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 13 operands: lhs = Expression(14, Add), rhs = Counter(4)
+- expression 14 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 15 operands: lhs = Counter(6), rhs = Expression(23, Add)
+- expression 16 operands: lhs = Counter(7), rhs = Counter(8)
+- expression 17 operands: lhs = Expression(0, Add), rhs = Counter(5)
+- expression 18 operands: lhs = Counter(5), rhs = Counter(6)
+- expression 19 operands: lhs = Expression(20, Sub), rhs = Expression(21, Sub)
+- expression 20 operands: lhs = Counter(5), rhs = Counter(6)
+- expression 21 operands: lhs = Expression(0, Add), rhs = Counter(5)
+- expression 22 operands: lhs = Counter(6), rhs = Expression(23, Add)
+- expression 23 operands: lhs = Counter(7), rhs = Counter(8)
+Number of file 0 mappings: 19
+- Code(Counter(0)) at (prev + 49, 1) to (start + 1, 16)
+- Code(Expression(0, Add)) at (prev + 4, 9) to (start + 0, 10)
+    = ((c4 + ((c2 + c3) - c4)) + ((c1 - c2) - c3))
+- Code(Counter(1)) at (prev + 0, 14) to (start + 0, 19)
+- Branch { true: Counter(2), false: Expression(9, Sub) } at (prev + 0, 14) to (start + 0, 19)
+    true  = c2
+    false = (c1 - c2)
+- Code(Expression(9, Sub)) at (prev + 0, 23) to (start + 0, 29)
+    = (c1 - c2)
+- Branch { true: Counter(3), false: Expression(8, Sub) } at (prev + 0, 23) to (start + 0, 29)
+    true  = c3
+    false = ((c1 - c2) - c3)
+- Code(Expression(14, Add)) at (prev + 0, 35) to (start + 0, 40)
+    = (c2 + c3)
+- Branch { true: Counter(4), false: Expression(13, Sub) } at (prev + 0, 35) to (start + 0, 40)
+    true  = c4
+    false = ((c2 + c3) - c4)
+- Code(Expression(13, Sub)) at (prev + 0, 44) to (start + 0, 51)
+    = ((c2 + c3) - c4)
+- Code(Expression(0, Add)) at (prev + 1, 5) to (start + 0, 17)
+    = ((c4 + ((c2 + c3) - c4)) + ((c1 - c2) - c3))
+- Code(Expression(22, Add)) at (prev + 3, 9) to (start + 0, 10)
+    = (c6 + (c7 + c8))
+- Code(Expression(0, Add)) at (prev + 0, 14) to (start + 0, 19)
+    = ((c4 + ((c2 + c3) - c4)) + ((c1 - c2) - c3))
+- Branch { true: Counter(5), false: Expression(21, Sub) } at (prev + 0, 14) to (start + 0, 19)
+    true  = c5
+    false = (((c4 + ((c2 + c3) - c4)) + ((c1 - c2) - c3)) - c5)
+- Code(Counter(5)) at (prev + 0, 23) to (start + 0, 28)
+- Branch { true: Counter(6), false: Expression(20, Sub) } at (prev + 0, 23) to (start + 0, 28)
+    true  = c6
+    false = (c5 - c6)
+- Code(Expression(19, Add)) at (prev + 0, 34) to (start + 0, 40)
+    = ((c5 - c6) + (((c4 + ((c2 + c3) - c4)) + ((c1 - c2) - c3)) - c5))
+- Branch { true: Counter(7), false: Counter(8) } at (prev + 0, 34) to (start + 0, 40)
+    true  = c7
+    false = c8
+- Code(Counter(7)) at (prev + 0, 44) to (start + 0, 51)
+- Code(Expression(22, Add)) at (prev + 1, 5) to (start + 1, 2)
+    = (c6 + (c7 + c8))
+
diff --git a/tests/coverage/branch/lazy-boolean.coverage b/tests/coverage/branch/lazy-boolean.coverage
new file mode 100644
index 00000000000..f6aba1da46e
--- /dev/null
+++ b/tests/coverage/branch/lazy-boolean.coverage
@@ -0,0 +1,113 @@
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2021
+   LL|       |//@ compile-flags: -Zcoverage-options=branch
+   LL|       |//@ llvm-cov-flags: --show-branches=count
+   LL|       |
+   LL|       |// Tests for branch coverage of the lazy boolean operators `&&` and `||`,
+   LL|       |// as ordinary expressions that aren't part of an `if` condition or similar.
+   LL|       |
+   LL|       |use core::hint::black_box;
+   LL|       |
+   LL|       |// Helper macro to prevent start-of-function spans from being merged into
+   LL|       |// spans on the lines we care about.
+   LL|       |macro_rules! no_merge {
+   LL|       |    () => {
+   LL|       |        for _ in 0..1 {}
+   LL|       |    };
+   LL|       |}
+   LL|       |
+   LL|     15|fn branch_and(a: bool, b: bool) {
+   LL|     15|    no_merge!();
+   LL|       |
+   LL|       |    //      |13  |18 (no branch)
+   LL|     15|    let c = a && b;
+                               ^12
+  ------------------
+  |  Branch (LL:13): [True: 12, False: 3]
+  ------------------
+   LL|     15|    black_box(c);
+   LL|     15|}
+   LL|       |
+   LL|     15|fn branch_or(a: bool, b: bool) {
+   LL|     15|    no_merge!();
+   LL|       |
+   LL|       |    //      |13  |18 (no branch)
+   LL|     15|    let c = a || b;
+                               ^3
+  ------------------
+  |  Branch (LL:13): [True: 12, False: 3]
+  ------------------
+   LL|     15|    black_box(c);
+   LL|     15|}
+   LL|       |
+   LL|       |// Test for chaining one operator several times.
+   LL|     16|fn chain(x: u32) {
+   LL|     16|    no_merge!();
+   LL|       |
+   LL|       |    //      |13      |22      |31      |40 (no branch)
+   LL|     16|    let c = x > 1 && x > 2 && x > 4 && x > 8;
+                                   ^14      ^13      ^11
+  ------------------
+  |  Branch (LL:13): [True: 14, False: 2]
+  |  Branch (LL:22): [True: 13, False: 1]
+  |  Branch (LL:31): [True: 11, False: 2]
+  ------------------
+   LL|     16|    black_box(c);
+   LL|       |
+   LL|       |    //      |13      |22      |31      |40 (no branch)
+   LL|     16|    let d = x < 1 || x < 2 || x < 4 || x < 8;
+                                   ^15      ^14      ^12
+  ------------------
+  |  Branch (LL:13): [True: 1, False: 15]
+  |  Branch (LL:22): [True: 1, False: 14]
+  |  Branch (LL:31): [True: 2, False: 12]
+  ------------------
+   LL|     16|    black_box(d);
+   LL|     16|}
+   LL|       |
+   LL|       |// Test for nested combinations of different operators.
+   LL|     16|fn nested_mixed(x: u32) {
+   LL|     16|    no_merge!();
+   LL|       |
+   LL|       |    //       |14      |23         |35      |44 (no branch)
+   LL|     16|    let c = (x < 4 || x >= 9) && (x < 2 || x >= 10);
+                                    ^12         ^11      ^9
+  ------------------
+  |  Branch (LL:14): [True: 4, False: 12]
+  |  Branch (LL:23): [True: 7, False: 5]
+  |  Branch (LL:35): [True: 2, False: 9]
+  ------------------
+   LL|     16|    black_box(c);
+   LL|       |
+   LL|       |    //       |14      |23        |34       |44 (no branch)
+   LL|     16|    let d = (x < 4 && x < 1) || (x >= 8 && x >= 10);
+                                    ^4         ^15       ^8
+  ------------------
+  |  Branch (LL:14): [True: 4, False: 12]
+  |  Branch (LL:23): [True: 1, False: 3]
+  |  Branch (LL:34): [True: 8, False: 7]
+  ------------------
+   LL|     16|    black_box(d);
+   LL|     16|}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    // Use each set of arguments (2^n) times, so that each combination has a
+   LL|       |    // unique sum, and we can use those sums to verify expected control flow.
+   LL|       |    // 1x (false, false)
+   LL|       |    // 2x (false, true)
+   LL|       |    // 4x (true, false)
+   LL|       |    // 8x (true, true)
+   LL|       |    for a in [false, true, true, true, true] {
+   LL|       |        for b in [false, true, true] {
+   LL|       |            branch_and(a, b);
+   LL|       |            branch_or(a, b);
+   LL|       |        }
+   LL|       |    }
+   LL|       |
+   LL|       |    for x in 0..16 {
+   LL|       |        chain(x);
+   LL|       |        nested_mixed(x);
+   LL|       |    }
+   LL|       |}
+
diff --git a/tests/coverage/branch/lazy-boolean.rs b/tests/coverage/branch/lazy-boolean.rs
new file mode 100644
index 00000000000..3c73fc1a87d
--- /dev/null
+++ b/tests/coverage/branch/lazy-boolean.rs
@@ -0,0 +1,80 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+//@ compile-flags: -Zcoverage-options=branch
+//@ llvm-cov-flags: --show-branches=count
+
+// Tests for branch coverage of the lazy boolean operators `&&` and `||`,
+// as ordinary expressions that aren't part of an `if` condition or similar.
+
+use core::hint::black_box;
+
+// Helper macro to prevent start-of-function spans from being merged into
+// spans on the lines we care about.
+macro_rules! no_merge {
+    () => {
+        for _ in 0..1 {}
+    };
+}
+
+fn branch_and(a: bool, b: bool) {
+    no_merge!();
+
+    //      |13  |18 (no branch)
+    let c = a && b;
+    black_box(c);
+}
+
+fn branch_or(a: bool, b: bool) {
+    no_merge!();
+
+    //      |13  |18 (no branch)
+    let c = a || b;
+    black_box(c);
+}
+
+// Test for chaining one operator several times.
+fn chain(x: u32) {
+    no_merge!();
+
+    //      |13      |22      |31      |40 (no branch)
+    let c = x > 1 && x > 2 && x > 4 && x > 8;
+    black_box(c);
+
+    //      |13      |22      |31      |40 (no branch)
+    let d = x < 1 || x < 2 || x < 4 || x < 8;
+    black_box(d);
+}
+
+// Test for nested combinations of different operators.
+fn nested_mixed(x: u32) {
+    no_merge!();
+
+    //       |14      |23         |35      |44 (no branch)
+    let c = (x < 4 || x >= 9) && (x < 2 || x >= 10);
+    black_box(c);
+
+    //       |14      |23        |34       |44 (no branch)
+    let d = (x < 4 && x < 1) || (x >= 8 && x >= 10);
+    black_box(d);
+}
+
+#[coverage(off)]
+fn main() {
+    // Use each set of arguments (2^n) times, so that each combination has a
+    // unique sum, and we can use those sums to verify expected control flow.
+    // 1x (false, false)
+    // 2x (false, true)
+    // 4x (true, false)
+    // 8x (true, true)
+    for a in [false, true, true, true, true] {
+        for b in [false, true, true] {
+            branch_and(a, b);
+            branch_or(a, b);
+        }
+    }
+
+    for x in 0..16 {
+        chain(x);
+        nested_mixed(x);
+    }
+}
diff --git a/tests/coverage/branch/while.cov-map b/tests/coverage/branch/while.cov-map
new file mode 100644
index 00000000000..5a3ef096bed
--- /dev/null
+++ b/tests/coverage/branch/while.cov-map
@@ -0,0 +1,98 @@
+Function name: while::while_cond
+Raw bytes (42): 0x[01, 01, 03, 05, 09, 03, 09, 03, 09, 06, 01, 0c, 01, 01, 10, 05, 03, 09, 00, 12, 03, 01, 0b, 00, 10, 20, 09, 0a, 00, 0b, 00, 10, 09, 00, 11, 02, 06, 0a, 03, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 3
+- expression 0 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 1 operands: lhs = Expression(0, Add), rhs = Counter(2)
+- expression 2 operands: lhs = Expression(0, Add), rhs = Counter(2)
+Number of file 0 mappings: 6
+- Code(Counter(0)) at (prev + 12, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 9) to (start + 0, 18)
+- Code(Expression(0, Add)) at (prev + 1, 11) to (start + 0, 16)
+    = (c1 + c2)
+- Branch { true: Counter(2), false: Expression(2, Sub) } at (prev + 0, 11) to (start + 0, 16)
+    true  = c2
+    false = ((c1 + c2) - c2)
+- Code(Counter(2)) at (prev + 0, 17) to (start + 2, 6)
+- Code(Expression(2, Sub)) at (prev + 3, 1) to (start + 0, 2)
+    = ((c1 + c2) - c2)
+
+Function name: while::while_cond_not
+Raw bytes (42): 0x[01, 01, 03, 05, 09, 03, 09, 03, 09, 06, 01, 15, 01, 01, 10, 05, 03, 09, 00, 12, 03, 01, 0b, 00, 14, 20, 09, 0a, 00, 0b, 00, 14, 09, 00, 15, 02, 06, 0a, 03, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 3
+- expression 0 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 1 operands: lhs = Expression(0, Add), rhs = Counter(2)
+- expression 2 operands: lhs = Expression(0, Add), rhs = Counter(2)
+Number of file 0 mappings: 6
+- Code(Counter(0)) at (prev + 21, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 9) to (start + 0, 18)
+- Code(Expression(0, Add)) at (prev + 1, 11) to (start + 0, 20)
+    = (c1 + c2)
+- Branch { true: Counter(2), false: Expression(2, Sub) } at (prev + 0, 11) to (start + 0, 20)
+    true  = c2
+    false = ((c1 + c2) - c2)
+- Code(Counter(2)) at (prev + 0, 21) to (start + 2, 6)
+- Code(Expression(2, Sub)) at (prev + 3, 1) to (start + 0, 2)
+    = ((c1 + c2) - c2)
+
+Function name: while::while_op_and
+Raw bytes (56): 0x[01, 01, 04, 05, 09, 03, 0d, 03, 0d, 11, 0d, 08, 01, 1e, 01, 01, 10, 05, 03, 09, 01, 12, 03, 02, 0b, 00, 10, 20, 0a, 0d, 00, 0b, 00, 10, 0a, 00, 14, 00, 19, 20, 09, 11, 00, 14, 00, 19, 09, 00, 1a, 03, 06, 0f, 04, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 4
+- expression 0 operands: lhs = Counter(1), rhs = Counter(2)
+- expression 1 operands: lhs = Expression(0, Add), rhs = Counter(3)
+- expression 2 operands: lhs = Expression(0, Add), rhs = Counter(3)
+- expression 3 operands: lhs = Counter(4), rhs = Counter(3)
+Number of file 0 mappings: 8
+- Code(Counter(0)) at (prev + 30, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 9) to (start + 1, 18)
+- Code(Expression(0, Add)) at (prev + 2, 11) to (start + 0, 16)
+    = (c1 + c2)
+- Branch { true: Expression(2, Sub), false: Counter(3) } at (prev + 0, 11) to (start + 0, 16)
+    true  = ((c1 + c2) - c3)
+    false = c3
+- Code(Expression(2, Sub)) at (prev + 0, 20) to (start + 0, 25)
+    = ((c1 + c2) - c3)
+- Branch { true: Counter(2), false: Counter(4) } at (prev + 0, 20) to (start + 0, 25)
+    true  = c2
+    false = c4
+- Code(Counter(2)) at (prev + 0, 26) to (start + 3, 6)
+- Code(Expression(3, Add)) at (prev + 4, 1) to (start + 0, 2)
+    = (c4 + c3)
+
+Function name: while::while_op_or
+Raw bytes (66): 0x[01, 01, 09, 05, 1b, 09, 0d, 03, 09, 03, 09, 22, 0d, 03, 09, 09, 0d, 22, 0d, 03, 09, 08, 01, 29, 01, 01, 10, 05, 03, 09, 01, 12, 03, 02, 0b, 00, 10, 20, 09, 22, 00, 0b, 00, 10, 22, 00, 14, 00, 19, 20, 0d, 1e, 00, 14, 00, 19, 1b, 00, 1a, 03, 06, 1e, 04, 01, 00, 02]
+Number of files: 1
+- file 0 => global file 1
+Number of expressions: 9
+- expression 0 operands: lhs = Counter(1), rhs = Expression(6, Add)
+- expression 1 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 2 operands: lhs = Expression(0, Add), rhs = Counter(2)
+- expression 3 operands: lhs = Expression(0, Add), rhs = Counter(2)
+- expression 4 operands: lhs = Expression(8, Sub), rhs = Counter(3)
+- expression 5 operands: lhs = Expression(0, Add), rhs = Counter(2)
+- expression 6 operands: lhs = Counter(2), rhs = Counter(3)
+- expression 7 operands: lhs = Expression(8, Sub), rhs = Counter(3)
+- expression 8 operands: lhs = Expression(0, Add), rhs = Counter(2)
+Number of file 0 mappings: 8
+- Code(Counter(0)) at (prev + 41, 1) to (start + 1, 16)
+- Code(Counter(1)) at (prev + 3, 9) to (start + 1, 18)
+- Code(Expression(0, Add)) at (prev + 2, 11) to (start + 0, 16)
+    = (c1 + (c2 + c3))
+- Branch { true: Counter(2), false: Expression(8, Sub) } at (prev + 0, 11) to (start + 0, 16)
+    true  = c2
+    false = ((c1 + (c2 + c3)) - c2)
+- Code(Expression(8, Sub)) at (prev + 0, 20) to (start + 0, 25)
+    = ((c1 + (c2 + c3)) - c2)
+- Branch { true: Counter(3), false: Expression(7, Sub) } at (prev + 0, 20) to (start + 0, 25)
+    true  = c3
+    false = (((c1 + (c2 + c3)) - c2) - c3)
+- Code(Expression(6, Add)) at (prev + 0, 26) to (start + 3, 6)
+    = (c2 + c3)
+- Code(Expression(7, Sub)) at (prev + 4, 1) to (start + 0, 2)
+    = (((c1 + (c2 + c3)) - c2) - c3)
+
diff --git a/tests/coverage/branch/while.coverage b/tests/coverage/branch/while.coverage
new file mode 100644
index 00000000000..8d9a6c3bc68
--- /dev/null
+++ b/tests/coverage/branch/while.coverage
@@ -0,0 +1,74 @@
+   LL|       |#![feature(coverage_attribute)]
+   LL|       |//@ edition: 2021
+   LL|       |//@ compile-flags: -Zcoverage-options=branch
+   LL|       |//@ llvm-cov-flags: --show-branches=count
+   LL|       |
+   LL|       |macro_rules! no_merge {
+   LL|       |    () => {
+   LL|       |        for _ in 0..1 {}
+   LL|       |    };
+   LL|       |}
+   LL|       |
+   LL|      1|fn while_cond() {
+   LL|      1|    no_merge!();
+   LL|       |
+   LL|      1|    let mut a = 8;
+   LL|      9|    while a > 0 {
+  ------------------
+  |  Branch (LL:11): [True: 8, False: 1]
+  ------------------
+   LL|      8|        a -= 1;
+   LL|      8|    }
+   LL|      1|}
+   LL|       |
+   LL|      1|fn while_cond_not() {
+   LL|      1|    no_merge!();
+   LL|       |
+   LL|      1|    let mut a = 8;
+   LL|      9|    while !(a == 0) {
+  ------------------
+  |  Branch (LL:11): [True: 8, False: 1]
+  ------------------
+   LL|      8|        a -= 1;
+   LL|      8|    }
+   LL|      1|}
+   LL|       |
+   LL|      1|fn while_op_and() {
+   LL|      1|    no_merge!();
+   LL|       |
+   LL|      1|    let mut a = 8;
+   LL|      1|    let mut b = 4;
+   LL|      5|    while a > 0 && b > 0 {
+  ------------------
+  |  Branch (LL:11): [True: 5, False: 0]
+  |  Branch (LL:20): [True: 4, False: 1]
+  ------------------
+   LL|      4|        a -= 1;
+   LL|      4|        b -= 1;
+   LL|      4|    }
+   LL|      1|}
+   LL|       |
+   LL|      1|fn while_op_or() {
+   LL|      1|    no_merge!();
+   LL|       |
+   LL|      1|    let mut a = 4;
+   LL|      1|    let mut b = 8;
+   LL|      9|    while a > 0 || b > 0 {
+                                 ^5
+  ------------------
+  |  Branch (LL:11): [True: 4, False: 5]
+  |  Branch (LL:20): [True: 4, False: 1]
+  ------------------
+   LL|      8|        a -= 1;
+   LL|      8|        b -= 1;
+   LL|      8|    }
+   LL|      1|}
+   LL|       |
+   LL|       |#[coverage(off)]
+   LL|       |fn main() {
+   LL|       |    while_cond();
+   LL|       |    while_cond_not();
+   LL|       |    while_op_and();
+   LL|       |    while_op_or();
+   LL|       |}
+
diff --git a/tests/coverage/branch/while.rs b/tests/coverage/branch/while.rs
new file mode 100644
index 00000000000..507815fbecb
--- /dev/null
+++ b/tests/coverage/branch/while.rs
@@ -0,0 +1,58 @@
+#![feature(coverage_attribute)]
+//@ edition: 2021
+//@ compile-flags: -Zcoverage-options=branch
+//@ llvm-cov-flags: --show-branches=count
+
+macro_rules! no_merge {
+    () => {
+        for _ in 0..1 {}
+    };
+}
+
+fn while_cond() {
+    no_merge!();
+
+    let mut a = 8;
+    while a > 0 {
+        a -= 1;
+    }
+}
+
+fn while_cond_not() {
+    no_merge!();
+
+    let mut a = 8;
+    while !(a == 0) {
+        a -= 1;
+    }
+}
+
+fn while_op_and() {
+    no_merge!();
+
+    let mut a = 8;
+    let mut b = 4;
+    while a > 0 && b > 0 {
+        a -= 1;
+        b -= 1;
+    }
+}
+
+fn while_op_or() {
+    no_merge!();
+
+    let mut a = 4;
+    let mut b = 8;
+    while a > 0 || b > 0 {
+        a -= 1;
+        b -= 1;
+    }
+}
+
+#[coverage(off)]
+fn main() {
+    while_cond();
+    while_cond_not();
+    while_op_and();
+    while_op_or();
+}