rustc_trans: avoid a separate entry BB if START_BLOCK has no backedges.

1 files changed, 37 insertions, 10 deletions

diff --git a/src/test/codegen/naked-functions.rs b/src/test/codegen/naked-functions.rs
index 9de74f72005..9883ca6b35d 100644
--- a/src/test/codegen/naked-functions.rs
+++ b/src/test/codegen/naked-functions.rs
@@ -20,7 +20,8 @@
 #[no_mangle]
 #[naked]
 fn naked_empty() {
-    // CHECK: ret void
+    // CHECK-NEXT: {{.+}}:
+    // CHECK-NEXT: ret void
 }
 
 // CHECK: Function Attrs: naked uwtable
@@ -28,9 +29,10 @@ fn naked_empty() {
 #[naked]
 // CHECK-NEXT: define internal void @naked_with_args(i{{[0-9]+}})
 fn naked_with_args(a: isize) {
-    // CHECK: %a = alloca i{{[0-9]+}}
-    // CHECK: ret void
+    // CHECK-NEXT: {{.+}}:
+    // CHECK-NEXT: %a = alloca i{{[0-9]+}}
     &a; // keep variable in an alloca
+    // CHECK: ret void
 }
 
 // CHECK: Function Attrs: naked uwtable
@@ -38,7 +40,8 @@ fn naked_with_args(a: isize) {
 #[no_mangle]
 #[naked]
 fn naked_with_return() -> isize {
-    // CHECK: ret i{{[0-9]+}} 0
+    // CHECK-NEXT: {{.+}}:
+    // CHECK-NEXT: ret i{{[0-9]+}} 0
     0
 }
 
@@ -47,9 +50,10 @@ fn naked_with_return() -> isize {
 #[no_mangle]
 #[naked]
 fn naked_with_args_and_return(a: isize) -> isize {
-    // CHECK: %a = alloca i{{[0-9]+}}
-    // CHECK: ret i{{[0-9]+}} %{{[0-9]+}}
+    // CHECK-NEXT: {{.+}}:
+    // CHECK-NEXT: %a = alloca i{{[0-9]+}}
     &a; // keep variable in an alloca
+    // CHECK: ret i{{[0-9]+}} %{{[0-9]+}}
     a
 }
 
@@ -58,14 +62,37 @@ fn naked_with_args_and_return(a: isize) -> isize {
 #[no_mangle]
 #[naked]
 fn naked_recursive() {
-    // CHECK: call void @naked_empty()
+    // CHECK-NEXT: {{.+}}:
+    // CHECK-NEXT: call void @naked_empty()
+
+    // FIXME(#39685) Avoid one block per call.
+    // CHECK-NEXT: br label %bb1
+    // CHECK: bb1:
+
     naked_empty();
-    // CHECK: %{{[0-9]+}} = call i{{[0-9]+}} @naked_with_return()
+
+    // CHECK-NEXT: %{{[0-9]+}} = call i{{[0-9]+}} @naked_with_return()
+
+    // FIXME(#39685) Avoid one block per call.
+    // CHECK-NEXT: br label %bb2
+    // CHECK: bb2:
+
+    // CHECK-NEXT: %{{[0-9]+}} = call i{{[0-9]+}} @naked_with_args_and_return(i{{[0-9]+}} %{{[0-9]+}})
+
+    // FIXME(#39685) Avoid one block per call.
+    // CHECK-NEXT: br label %bb3
+    // CHECK: bb3:
+
+    // CHECK-NEXT: call void @naked_with_args(i{{[0-9]+}} %{{[0-9]+}})
+
+    // FIXME(#39685) Avoid one block per call.
+    // CHECK-NEXT: br label %bb4
+    // CHECK: bb4:
+
     naked_with_args(
-        // CHECK: %{{[0-9]+}} = call i{{[0-9]+}} @naked_with_args_and_return(i{{[0-9]+}} %{{[0-9]+}})
         naked_with_args_and_return(
-            // CHECK: call void @naked_with_args(i{{[0-9]+}} %{{[0-9]+}})
             naked_with_return()
         )
     );
+    // CHECK-NEXT: ret void
 }