diff options
| -rw-r--r-- | compiler/rustc_hir_analysis/src/check/intrinsic.rs | 1 | ||||
| -rw-r--r-- | compiler/rustc_mir_transform/src/lower_intrinsics.rs | 23 | ||||
| -rw-r--r-- | compiler/rustc_span/src/symbol.rs | 1 | ||||
| -rw-r--r-- | library/core/src/intrinsics.rs | 30 | ||||
| -rw-r--r-- | library/core/src/ptr/mod.rs | 17 | ||||
| -rw-r--r-- | tests/codegen/mem-replace-big-type.rs | 14 | ||||
| -rw-r--r-- | tests/codegen/mem-replace-direct-memcpy.rs | 33 | ||||
| -rw-r--r-- | tests/codegen/mem-replace-simple-type.rs | 34 | ||||
| -rw-r--r-- | tests/mir-opt/lower_intrinsics.option_payload.LowerIntrinsics.diff | 4 | ||||
| -rw-r--r-- | tests/mir-opt/lower_intrinsics.ptr_offset.LowerIntrinsics.diff | 2 | ||||
| -rw-r--r-- | tests/mir-opt/lower_intrinsics.rs | 5 | ||||
| -rw-r--r-- | tests/mir-opt/lower_intrinsics.write_via_move_string.LowerIntrinsics.diff | 36 | ||||
| -rw-r--r-- | tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir | 32 |
13 files changed, 154 insertions, 78 deletions
diff --git a/compiler/rustc_hir_analysis/src/check/intrinsic.rs b/compiler/rustc_hir_analysis/src/check/intrinsic.rs index d505d8b8e0b..6a10b50aa16 100644 --- a/compiler/rustc_hir_analysis/src/check/intrinsic.rs +++ b/compiler/rustc_hir_analysis/src/check/intrinsic.rs @@ -381,6 +381,7 @@ pub fn check_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) { sym::unlikely => (0, vec![tcx.types.bool], tcx.types.bool), sym::read_via_copy => (1, vec![tcx.mk_imm_ptr(param(0))], param(0)), + sym::write_via_move => (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], tcx.mk_unit()), sym::discriminant_value => { let assoc_items = tcx.associated_item_def_ids( diff --git a/compiler/rustc_mir_transform/src/lower_intrinsics.rs b/compiler/rustc_mir_transform/src/lower_intrinsics.rs index 62b727674c5..69ba4840146 100644 --- a/compiler/rustc_mir_transform/src/lower_intrinsics.rs +++ b/compiler/rustc_mir_transform/src/lower_intrinsics.rs @@ -179,6 +179,29 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics { } } } + sym::write_via_move => { + let target = target.unwrap(); + let Ok([ptr, val]) = <[_; 2]>::try_from(std::mem::take(args)) else { + span_bug!( + terminator.source_info.span, + "Wrong number of arguments for write_via_move intrinsic", + ); + }; + let derefed_place = + if let Some(place) = ptr.place() && let Some(local) = place.as_local() { + tcx.mk_place_deref(local.into()) + } else { + span_bug!(terminator.source_info.span, "Only passing a local is supported"); + }; + block.statements.push(Statement { + source_info: terminator.source_info, + kind: StatementKind::Assign(Box::new(( + derefed_place, + Rvalue::Use(val), + ))), + }); + terminator.kind = TerminatorKind::Goto { target }; + } sym::discriminant_value => { if let (Some(target), Some(arg)) = (*target, args[0].place()) { let arg = tcx.mk_place_deref(arg); diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs index c2619956219..e7c8a08f2a1 100644 --- a/compiler/rustc_span/src/symbol.rs +++ b/compiler/rustc_span/src/symbol.rs @@ -1635,6 +1635,7 @@ symbols! { write_bytes, write_macro, write_str, + write_via_move, writeln_macro, x87_reg, xer, diff --git a/library/core/src/intrinsics.rs b/library/core/src/intrinsics.rs index 79bd0bbb0c1..077c0fdc380 100644 --- a/library/core/src/intrinsics.rs +++ b/library/core/src/intrinsics.rs @@ -2257,12 +2257,23 @@ extern "rust-intrinsic" { /// This is an implementation detail of [`crate::ptr::read`] and should /// not be used anywhere else. See its comments for why this exists. /// - /// This intrinsic can *only* be called where the argument is a local without - /// projections (`read_via_copy(p)`, not `read_via_copy(*p)`) so that it + /// This intrinsic can *only* be called where the pointer is a local without + /// projections (`read_via_copy(ptr)`, not `read_via_copy(*ptr)`) so that it /// trivially obeys runtime-MIR rules about derefs in operands. #[rustc_const_unstable(feature = "const_ptr_read", issue = "80377")] #[rustc_nounwind] - pub fn read_via_copy<T>(p: *const T) -> T; + pub fn read_via_copy<T>(ptr: *const T) -> T; + + /// This is an implementation detail of [`crate::ptr::write`] and should + /// not be used anywhere else. See its comments for why this exists. + /// + /// This intrinsic can *only* be called where the pointer is a local without + /// projections (`write_via_move(ptr, x)`, not `write_via_move(*ptr, x)`) so + /// that it trivially obeys runtime-MIR rules about derefs in operands. + #[cfg(not(bootstrap))] + #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")] + #[rustc_nounwind] + pub fn write_via_move<T>(ptr: *mut T, value: T); /// Returns the value of the discriminant for the variant in 'v'; /// if `T` has no discriminant, returns `0`. @@ -2828,3 +2839,16 @@ pub const unsafe fn transmute_unchecked<Src, Dst>(src: Src) -> Dst { // SAFETY: It's a transmute -- the caller promised it's fine. unsafe { transmute_copy(&ManuallyDrop::new(src)) } } + +/// Polyfill for bootstrap +#[cfg(bootstrap)] +pub const unsafe fn write_via_move<T>(ptr: *mut T, value: T) { + use crate::mem::*; + // SAFETY: the caller must guarantee that `dst` is valid for writes. + // `dst` cannot overlap `src` because the caller has mutable access + // to `dst` while `src` is owned by this function. + unsafe { + copy_nonoverlapping::<T>(&value, ptr, 1); + forget(value); + } +} diff --git a/library/core/src/ptr/mod.rs b/library/core/src/ptr/mod.rs index 13e546497f2..5f55f762ad5 100644 --- a/library/core/src/ptr/mod.rs +++ b/library/core/src/ptr/mod.rs @@ -1349,13 +1349,13 @@ pub const unsafe fn read_unaligned<T>(src: *const T) -> T { #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")] #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces pub const unsafe fn write<T>(dst: *mut T, src: T) { - // We are calling the intrinsics directly to avoid function calls in the generated code - // as `intrinsics::copy_nonoverlapping` is a wrapper function. - extern "rust-intrinsic" { - #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")] - #[rustc_nounwind] - fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize); - } + // Semantically, it would be fine for this to be implemented as a + // `copy_nonoverlapping` and appropriate drop suppression of `src`. + + // However, implementing via that currently produces more MIR than is ideal. + // Using an intrinsic keeps it down to just the simple `*dst = move src` in + // MIR (11 statements shorter, at the time of writing), and also allows + // `src` to stay an SSA value in codegen_ssa, rather than a memory one. // SAFETY: the caller must guarantee that `dst` is valid for writes. // `dst` cannot overlap `src` because the caller has mutable access @@ -1365,8 +1365,7 @@ pub const unsafe fn write<T>(dst: *mut T, src: T) { "ptr::write requires that the pointer argument is aligned and non-null", [T](dst: *mut T) => is_aligned_and_not_null(dst) ); - copy_nonoverlapping(&src as *const T, dst, 1); - intrinsics::forget(src); + intrinsics::write_via_move(dst, src) } } diff --git a/tests/codegen/mem-replace-big-type.rs b/tests/codegen/mem-replace-big-type.rs index f6898e2f758..81e56b5490d 100644 --- a/tests/codegen/mem-replace-big-type.rs +++ b/tests/codegen/mem-replace-big-type.rs @@ -11,7 +11,9 @@ #[repr(C, align(8))] pub struct Big([u64; 7]); pub fn replace_big(dst: &mut Big, src: Big) -> Big { - // Before the `read_via_copy` intrinsic, this emitted six `memcpy`s. + // Back in 1.68, this emitted six `memcpy`s. + // `read_via_copy` in 1.69 got that down to three. + // `write_via_move` has it down to just the two essential ones. std::mem::replace(dst, src) } @@ -20,17 +22,13 @@ pub fn replace_big(dst: &mut Big, src: Big) -> Big { // CHECK-NOT: call void @llvm.memcpy -// For a large type, we expect exactly three `memcpy`s +// For a large type, we expect exactly two `memcpy`s // CHECK-LABEL: define internal void @{{.+}}mem{{.+}}replace{{.+}}sret(%Big) // CHECK-NOT: alloca - // CHECK: alloca %Big - // CHECK-NOT: alloca - // CHECK-NOT: call void @llvm.memcpy - // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %{{.*}}, {{i8\*|ptr}} align 8 %{{.*}}, i{{.*}} 56, i1 false) // CHECK-NOT: call void @llvm.memcpy - // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %{{.*}}, {{i8\*|ptr}} align 8 %{{.*}}, i{{.*}} 56, i1 false) + // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %0, {{i8\*|ptr}} align 8 %dest, i{{.*}} 56, i1 false) // CHECK-NOT: call void @llvm.memcpy - // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %{{.*}}, {{i8\*|ptr}} align 8 %{{.*}}, i{{.*}} 56, i1 false) + // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 8 %dest, {{i8\*|ptr}} align 8 %src, i{{.*}} 56, i1 false) // CHECK-NOT: call void @llvm.memcpy // CHECK-NOT: call void @llvm.memcpy diff --git a/tests/codegen/mem-replace-direct-memcpy.rs b/tests/codegen/mem-replace-direct-memcpy.rs deleted file mode 100644 index 83babab4f84..00000000000 --- a/tests/codegen/mem-replace-direct-memcpy.rs +++ /dev/null @@ -1,33 +0,0 @@ -// This test ensures that `mem::replace::<T>` only ever calls `@llvm.memcpy` -// with `size_of::<T>()` as the size, and never goes through any wrapper that -// may e.g. multiply `size_of::<T>()` with a variable "count" (which is only -// known to be `1` after inlining). - -// compile-flags: -C no-prepopulate-passes -Zinline-mir=no -// ignore-debug: the debug assertions get in the way - -#![crate_type = "lib"] - -pub fn replace_byte(dst: &mut u8, src: u8) -> u8 { - std::mem::replace(dst, src) -} - -// NOTE(eddyb) the `CHECK-NOT`s ensure that the only calls of `@llvm.memcpy` in -// the entire output, are the direct calls we want, from `ptr::replace`. - -// CHECK-NOT: call void @llvm.memcpy - -// For a small type, we expect one each of `load`/`store`/`memcpy` instead -// CHECK-LABEL: define internal noundef i8 @{{.+}}mem{{.+}}replace - // CHECK-NOT: alloca - // CHECK: alloca i8 - // CHECK-NOT: alloca - // CHECK-NOT: call void @llvm.memcpy - // CHECK: load i8 - // CHECK-NOT: call void @llvm.memcpy - // CHECK: store i8 - // CHECK-NOT: call void @llvm.memcpy - // CHECK: call void @llvm.memcpy.{{.+}}({{i8\*|ptr}} align 1 %{{.*}}, {{i8\*|ptr}} align 1 %{{.*}}, i{{.*}} 1, i1 false) - // CHECK-NOT: call void @llvm.memcpy - -// CHECK-NOT: call void @llvm.memcpy diff --git a/tests/codegen/mem-replace-simple-type.rs b/tests/codegen/mem-replace-simple-type.rs new file mode 100644 index 00000000000..4253ef13666 --- /dev/null +++ b/tests/codegen/mem-replace-simple-type.rs @@ -0,0 +1,34 @@ +// compile-flags: -O -C no-prepopulate-passes +// min-llvm-version: 15.0 (for opaque pointers) +// only-x86_64 (to not worry about usize differing) +// ignore-debug (the debug assertions get in the way) + +#![crate_type = "lib"] + +#[no_mangle] +// CHECK-LABEL: @replace_usize( +pub fn replace_usize(r: &mut usize, v: usize) -> usize { + // CHECK-NOT: alloca + // CHECK: %[[R:.+]] = load i64, ptr %r + // CHECK: store i64 %v, ptr %r + // CHECK: ret i64 %[[R]] + std::mem::replace(r, v) +} + +#[no_mangle] +// CHECK-LABEL: @replace_ref_str( +pub fn replace_ref_str<'a>(r: &mut &'a str, v: &'a str) -> &'a str { + // CHECK-NOT: alloca + // CHECK: %[[A:.+]] = load ptr + // CHECK: %[[B:.+]] = load i64 + // CHECK-NOT: store + // CHECK-NOT: load + // CHECK: store ptr + // CHECK: store i64 + // CHECK-NOT: load + // CHECK-NOT: store + // CHECK: %[[P1:.+]] = insertvalue { ptr, i64 } poison, ptr %[[A]], 0 + // CHECK: %[[P2:.+]] = insertvalue { ptr, i64 } %[[P1]], i64 %[[B]], 1 + // CHECK: ret { ptr, i64 } %[[P2]] + std::mem::replace(r, v) +} diff --git a/tests/mir-opt/lower_intrinsics.option_payload.LowerIntrinsics.diff b/tests/mir-opt/lower_intrinsics.option_payload.LowerIntrinsics.diff index 93863fca344..b022e2ba42b 100644 --- a/tests/mir-opt/lower_intrinsics.option_payload.LowerIntrinsics.diff +++ b/tests/mir-opt/lower_intrinsics.option_payload.LowerIntrinsics.diff @@ -24,7 +24,7 @@ _4 = &raw const (*_1); // scope 1 at $DIR/lower_intrinsics.rs:+2:55: +2:56 - _3 = option_payload_ptr::<usize>(move _4) -> [return: bb1, unwind unreachable]; // scope 1 at $DIR/lower_intrinsics.rs:+2:18: +2:57 - // mir::Constant -- // + span: $DIR/lower_intrinsics.rs:132:18: 132:54 +- // + span: $DIR/lower_intrinsics.rs:137:18: 137:54 - // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const Option<usize>) -> *const usize {option_payload_ptr::<usize>}, val: Value(<ZST>) } + _3 = &raw const (((*_4) as Some).0: usize); // scope 1 at $DIR/lower_intrinsics.rs:+2:18: +2:57 + goto -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:+2:18: +2:57 @@ -37,7 +37,7 @@ _6 = &raw const (*_2); // scope 2 at $DIR/lower_intrinsics.rs:+3:55: +3:56 - _5 = option_payload_ptr::<String>(move _6) -> [return: bb2, unwind unreachable]; // scope 2 at $DIR/lower_intrinsics.rs:+3:18: +3:57 - // mir::Constant -- // + span: $DIR/lower_intrinsics.rs:133:18: 133:54 +- // + span: $DIR/lower_intrinsics.rs:138:18: 138:54 - // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const Option<String>) -> *const String {option_payload_ptr::<String>}, val: Value(<ZST>) } + _5 = &raw const (((*_6) as Some).0: std::string::String); // scope 2 at $DIR/lower_intrinsics.rs:+3:18: +3:57 + goto -> bb2; // scope 2 at $DIR/lower_intrinsics.rs:+3:18: +3:57 diff --git a/tests/mir-opt/lower_intrinsics.ptr_offset.LowerIntrinsics.diff b/tests/mir-opt/lower_intrinsics.ptr_offset.LowerIntrinsics.diff index 37f1995a53a..60a1dd0ba7d 100644 --- a/tests/mir-opt/lower_intrinsics.ptr_offset.LowerIntrinsics.diff +++ b/tests/mir-opt/lower_intrinsics.ptr_offset.LowerIntrinsics.diff @@ -15,7 +15,7 @@ _4 = _2; // scope 0 at $DIR/lower_intrinsics.rs:+1:33: +1:34 - _0 = offset::<*const i32, isize>(move _3, move _4) -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:35 - // mir::Constant -- // + span: $DIR/lower_intrinsics.rs:139:5: 139:29 +- // + span: $DIR/lower_intrinsics.rs:144:5: 144:29 - // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const i32, isize) -> *const i32 {offset::<*const i32, isize>}, val: Value(<ZST>) } + _0 = Offset(move _3, move _4); // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:35 + goto -> bb1; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:35 diff --git a/tests/mir-opt/lower_intrinsics.rs b/tests/mir-opt/lower_intrinsics.rs index 2b1e67be2a9..0ca88a42e3f 100644 --- a/tests/mir-opt/lower_intrinsics.rs +++ b/tests/mir-opt/lower_intrinsics.rs @@ -124,6 +124,11 @@ pub fn read_via_copy_uninhabited(r: &Never) -> Never { unsafe { core::intrinsics::read_via_copy(r) } } +// EMIT_MIR lower_intrinsics.write_via_move_string.LowerIntrinsics.diff +pub fn write_via_move_string(r: &mut String, v: String) { + unsafe { core::intrinsics::write_via_move(r, v) } +} + pub enum Never {} // EMIT_MIR lower_intrinsics.option_payload.LowerIntrinsics.diff diff --git a/tests/mir-opt/lower_intrinsics.write_via_move_string.LowerIntrinsics.diff b/tests/mir-opt/lower_intrinsics.write_via_move_string.LowerIntrinsics.diff new file mode 100644 index 00000000000..38d99f661dc --- /dev/null +++ b/tests/mir-opt/lower_intrinsics.write_via_move_string.LowerIntrinsics.diff @@ -0,0 +1,36 @@ +- // MIR for `write_via_move_string` before LowerIntrinsics ++ // MIR for `write_via_move_string` after LowerIntrinsics + + fn write_via_move_string(_1: &mut String, _2: String) -> () { + debug r => _1; // in scope 0 at $DIR/lower_intrinsics.rs:+0:30: +0:31 + debug v => _2; // in scope 0 at $DIR/lower_intrinsics.rs:+0:46: +0:47 + let mut _0: (); // return place in scope 0 at $DIR/lower_intrinsics.rs:+0:57: +0:57 + let mut _3: *mut std::string::String; // in scope 0 at $DIR/lower_intrinsics.rs:+1:47: +1:48 + let mut _4: std::string::String; // in scope 0 at $DIR/lower_intrinsics.rs:+1:50: +1:51 + scope 1 { + } + + bb0: { + StorageLive(_3); // scope 1 at $DIR/lower_intrinsics.rs:+1:47: +1:48 + _3 = &raw mut (*_1); // scope 1 at $DIR/lower_intrinsics.rs:+1:47: +1:48 + StorageLive(_4); // scope 1 at $DIR/lower_intrinsics.rs:+1:50: +1:51 + _4 = move _2; // scope 1 at $DIR/lower_intrinsics.rs:+1:50: +1:51 +- _0 = write_via_move::<String>(move _3, move _4) -> [return: bb1, unwind unreachable]; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:52 +- // mir::Constant +- // + span: $DIR/lower_intrinsics.rs:129:14: 129:46 +- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*mut String, String) {write_via_move::<String>}, val: Value(<ZST>) } ++ (*_3) = move _4; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:52 ++ goto -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:52 + } + + bb1: { + StorageDead(_4); // scope 1 at $DIR/lower_intrinsics.rs:+1:51: +1:52 + StorageDead(_3); // scope 1 at $DIR/lower_intrinsics.rs:+1:51: +1:52 + goto -> bb2; // scope 0 at $DIR/lower_intrinsics.rs:+2:1: +2:2 + } + + bb2: { + return; // scope 0 at $DIR/lower_intrinsics.rs:+2:2: +2:2 + } + } + diff --git a/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir index 19e79e0a2f0..50e0538c133 100644 --- a/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir +++ b/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir @@ -9,29 +9,26 @@ fn mem_replace(_1: &mut u32, _2: u32) -> u32 { debug src => _2; // in scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL let mut _3: *const u32; // in scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL let mut _4: *mut u32; // in scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL - let mut _5: u32; // in scope 1 at $SRC_DIR/core/src/mem/mod.rs:LL:COL scope 2 { scope 3 { debug result => _0; // in scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL scope 7 (inlined std::ptr::write::<u32>) { // at $SRC_DIR/core/src/mem/mod.rs:LL:COL debug dst => _4; // in scope 7 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - debug src => _5; // in scope 7 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - let mut _7: *const u32; // in scope 7 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - let _8: &u32; // in scope 7 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - let mut _9: *mut u32; // in scope 7 at $SRC_DIR/core/src/intrinsics.rs:LL:COL + debug src => _2; // in scope 7 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL + let mut _6: *mut u32; // in scope 7 at $SRC_DIR/core/src/intrinsics.rs:LL:COL scope 8 { scope 9 (inlined std::ptr::write::runtime::<u32>) { // at $SRC_DIR/core/src/intrinsics.rs:LL:COL - debug dst => _9; // in scope 9 at $SRC_DIR/core/src/intrinsics.rs:LL:COL + debug dst => _6; // in scope 9 at $SRC_DIR/core/src/intrinsics.rs:LL:COL } } } } scope 4 (inlined std::ptr::read::<u32>) { // at $SRC_DIR/core/src/mem/mod.rs:LL:COL debug src => _3; // in scope 4 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - let mut _6: *const u32; // in scope 4 at $SRC_DIR/core/src/intrinsics.rs:LL:COL + let mut _5: *const u32; // in scope 4 at $SRC_DIR/core/src/intrinsics.rs:LL:COL scope 5 { scope 6 (inlined std::ptr::read::runtime::<u32>) { // at $SRC_DIR/core/src/intrinsics.rs:LL:COL - debug src => _6; // in scope 6 at $SRC_DIR/core/src/intrinsics.rs:LL:COL + debug src => _5; // in scope 6 at $SRC_DIR/core/src/intrinsics.rs:LL:COL } } } @@ -41,24 +38,15 @@ fn mem_replace(_1: &mut u32, _2: u32) -> u32 { bb0: { StorageLive(_3); // scope 2 at $SRC_DIR/core/src/mem/mod.rs:LL:COL _3 = &raw const (*_1); // scope 2 at $SRC_DIR/core/src/mem/mod.rs:LL:COL - StorageLive(_6); // scope 2 at $SRC_DIR/core/src/mem/mod.rs:LL:COL + StorageLive(_5); // scope 2 at $SRC_DIR/core/src/mem/mod.rs:LL:COL _0 = (*_3); // scope 5 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - StorageDead(_6); // scope 2 at $SRC_DIR/core/src/mem/mod.rs:LL:COL + StorageDead(_5); // scope 2 at $SRC_DIR/core/src/mem/mod.rs:LL:COL StorageDead(_3); // scope 2 at $SRC_DIR/core/src/mem/mod.rs:LL:COL StorageLive(_4); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL _4 = &raw mut (*_1); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL - StorageLive(_5); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL - _5 = _2; // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL - StorageLive(_9); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL - StorageLive(_7); // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - StorageLive(_8); // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - _8 = &_5; // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - _7 = &raw const (*_8); // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - copy_nonoverlapping(dst = _4, src = move _7, count = const 1_usize); // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - StorageDead(_7); // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - StorageDead(_8); // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL - StorageDead(_9); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL - StorageDead(_5); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL + StorageLive(_6); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL + (*_4) = _2; // scope 8 at $SRC_DIR/core/src/ptr/mod.rs:LL:COL + StorageDead(_6); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL StorageDead(_4); // scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL return; // scope 0 at $DIR/mem_replace.rs:+2:2: +2:2 } |