db03d9d33a
In the re-commit, just dropping the propagation of `writeonly` as that is the only attribute that can play poorly with call slot optimization (see issue: #95152 for more details). Closes #95888
58 lines
1.8 KiB
LLVM
58 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes='default<O3>' < %s | FileCheck %s
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; Make sure that interaction of "writable" with various passes does not
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; result in the elimination of the store prior to @j().
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; FIXME: This is a miscompile.
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declare void @use(i64)
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define void @j(ptr %p) optnone noinline {
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; CHECK-LABEL: define void @j(
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; CHECK-SAME: ptr [[P:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: [[I:%.*]] = load i64, ptr [[P]], align 4
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; CHECK-NEXT: call void @use(i64 [[I]])
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; CHECK-NEXT: ret void
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;
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%i = load i64, ptr %p
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call void @use(i64 %i)
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ret void
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}
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define void @h(ptr %p) {
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; CHECK-LABEL: define void @h(
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; CHECK-SAME: ptr [[P:%.*]]) local_unnamed_addr {
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; CHECK-NEXT: store i64 3, ptr [[P]], align 4
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; CHECK-NEXT: tail call void @j(ptr nonnull [[P]])
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; CHECK-NEXT: ret void
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;
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store i64 3, ptr %p
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call void @j(ptr %p)
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ret void
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}
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define void @g(ptr dead_on_unwind noalias writable dereferenceable(8) align 8 %p) minsize {
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; CHECK-LABEL: define void @g(
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; CHECK-SAME: ptr dead_on_unwind noalias nocapture writable writeonly align 8 dereferenceable(8) [[P:%.*]]) local_unnamed_addr #[[ATTR1:[0-9]+]] {
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; CHECK-NEXT: tail call void @h(ptr nonnull [[P]])
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; CHECK-NEXT: ret void
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;
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%a = alloca i64
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call void @h(ptr %a)
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call void @llvm.memcpy(ptr align 8 %p, ptr align 8 %a, i64 8, i1 false)
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ret void
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}
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define void @f(ptr dead_on_unwind noalias %p) {
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; CHECK-LABEL: define void @f(
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; CHECK-SAME: ptr dead_on_unwind noalias [[P:%.*]]) local_unnamed_addr {
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; CHECK-NEXT: store i64 3, ptr [[P]], align 4
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; CHECK-NEXT: tail call void @j(ptr nonnull [[P]])
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; CHECK-NEXT: store i64 43, ptr [[P]], align 4
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; CHECK-NEXT: ret void
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;
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call void @g(ptr %p)
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store i64 43, ptr %p
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ret void
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}
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