c23b4fbdbb
Now that #149310 has restricted lifetime intrinsics to only work on allocas, we can also drop the explicit size argument. Instead, the size is implied by the alloca. This removes the ability to only mark a prefix of an alloca alive/dead. We never used that capability, so we should remove the need to handle that possibility everywhere (though many key places, including stack coloring, did not actually respect this).
55 lines
1.9 KiB
LLVM
55 lines
1.9 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=newgvn < %s | FileCheck %s
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; MemorySSA says that load1 depends on the lifetime start.
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; That's OK since MemorySSA is may-alias; however, NewGVN should
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; check whether the lifetime start *actually* defines the loaded pointer
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; before simplifying to uninitialized memory.
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define void @foo(ptr %arg) {
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; CHECK-LABEL: define void @foo(
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; CHECK-SAME: ptr [[ARG:%.*]]) {
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; CHECK-NEXT: [[BB:.*:]]
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; CHECK-NEXT: [[ALLOCA:%.*]] = alloca i8, align 16
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr [[ALLOCA]])
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; CHECK-NEXT: [[LOAD:%.*]] = load ptr, ptr [[ARG]], align 8
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; CHECK-NEXT: [[LOAD1:%.*]] = load ptr, ptr [[LOAD]], align 8
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; CHECK-NEXT: [[CALL:%.*]] = call ptr [[LOAD1]](ptr [[ALLOCA]])
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; CHECK-NEXT: ret void
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;
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bb:
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%alloca = alloca i8, align 16
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call void @llvm.lifetime.start.p0(ptr %alloca)
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%load = load ptr, ptr %arg, align 8
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%load1 = load ptr, ptr %load, align 8
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%call = call ptr %load1(ptr %alloca)
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ret void
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}
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declare void @llvm.lifetime.start.p0(ptr captures(none)) #0
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declare ptr @malloc(i64)
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; This case is handled correctly.
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; Since malloc returns a pointer, NewGVN checks whether
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; it is the same pointer, an equivalent one, or a must-alias.
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define void @wombat(ptr %arg) {
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; CHECK-LABEL: define void @wombat(
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; CHECK-SAME: ptr [[ARG:%.*]]) {
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; CHECK-NEXT: [[BB:.*:]]
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; CHECK-NEXT: [[CALL:%.*]] = call ptr @malloc(i64 1)
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; CHECK-NEXT: [[LOAD:%.*]] = load ptr, ptr [[ARG]], align 8
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; CHECK-NEXT: [[LOAD1:%.*]] = load ptr, ptr [[LOAD]], align 8
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; CHECK-NEXT: [[CALL2:%.*]] = call ptr [[LOAD1]](ptr [[CALL]])
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; CHECK-NEXT: ret void
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;
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bb:
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%call = call ptr @malloc(i64 1)
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%load = load ptr, ptr %arg, align 8
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%load1 = load ptr, ptr %load, align 8
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%call2 = call ptr %load1(ptr %call)
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ret void
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}
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attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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