derek.holloway
7502bf64a4
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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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