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d785861d7b
An exception could prevent a store from occurring but MemCpyOpt's callslot optimization would fire anyway, causing the store to occur. This fixes PR27849. llvm-svn: 270892
35 lines
1.1 KiB
LLVM
35 lines
1.1 KiB
LLVM
; RUN: opt -S -memcpyopt < %s | FileCheck %s
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declare void @may_throw(i32* nocapture %x)
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; CHECK-LABEL: define void @test1(
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define void @test1(i32* nocapture noalias dereferenceable(4) %x) {
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entry:
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%t = alloca i32, align 4
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call void @may_throw(i32* nonnull %t)
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%load = load i32, i32* %t, align 4
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store i32 %load, i32* %x, align 4
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; CHECK: %[[t:.*]] = alloca i32, align 4
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; CHECK-NEXT: call void @may_throw(i32* {{.*}} %[[t]])
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; CHECK-NEXT: %[[load:.*]] = load i32, i32* %[[t]], align 4
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; CHECK-NEXT: store i32 %[[load]], i32* %x, align 4
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ret void
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}
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declare void @always_throws()
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; CHECK-LABEL: define void @test2(
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define void @test2(i32* nocapture noalias dereferenceable(4) %x) {
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entry:
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%t = alloca i32, align 4
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call void @may_throw(i32* nonnull %t) nounwind
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%load = load i32, i32* %t, align 4
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call void @always_throws()
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store i32 %load, i32* %x, align 4
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; CHECK: %[[t:.*]] = alloca i32, align 4
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; CHECK-NEXT: call void @may_throw(i32* {{.*}} %[[t]])
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; CHECK-NEXT: %[[load:.*]] = load i32, i32* %[[t]], align 4
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; CHECK-NEXT: call void @always_throws()
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; CHECK-NEXT: store i32 %[[load]], i32* %x, align 4
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ret void
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}
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