forked from OSchip/llvm-project
71 lines
1.8 KiB
LLVM
71 lines
1.8 KiB
LLVM
; RUN: opt -mem2reg -S -o - < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n8:16:32:64"
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declare void @llvm.lifetime.start(i64 %size, i8* nocapture %ptr)
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declare void @llvm.lifetime.end(i64 %size, i8* nocapture %ptr)
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define void @test1() {
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; Ensure we can look through a bitcast to i8* and the addition of lifetime
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; markers.
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;
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; CHECK-LABEL: @test1(
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; CHECK-NOT: alloca
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; CHECK: ret void
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%A = alloca i32
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%B = bitcast i32* %A to i8*
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call void @llvm.lifetime.start(i64 2, i8* %B)
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store i32 1, i32* %A
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call void @llvm.lifetime.end(i64 2, i8* %B)
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ret void
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}
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define void @test2() {
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; Ensure we can look through a GEP to i8* and the addition of lifetime
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; markers.
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;
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; CHECK-LABEL: @test2(
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; CHECK-NOT: alloca
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; CHECK: ret void
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%A = alloca {i8, i16}
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%B = getelementptr {i8, i16}* %A, i32 0, i32 0
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call void @llvm.lifetime.start(i64 2, i8* %B)
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store {i8, i16} zeroinitializer, {i8, i16}* %A
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call void @llvm.lifetime.end(i64 2, i8* %B)
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ret void
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}
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define i32 @test3(i32 %x) {
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; CHECK-LABEL: @test3(
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;
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; Check that we recursively walk the uses of the alloca and thus can see
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; through round trip bitcasts, dead bitcasts, GEPs, multiple GEPs, and lifetime
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; markers.
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entry:
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%a = alloca i32
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; CHECK-NOT: alloca
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%b = bitcast i32* %a to i8*
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%b2 = getelementptr inbounds i8* %b, i32 0
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%b3 = getelementptr inbounds i8* %b2, i32 0
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call void @llvm.lifetime.start(i64 -1, i8* %b3)
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; CHECK-NOT: call void @llvm.lifetime.start
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store i32 %x, i32* %a
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; CHECK-NOT: store
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%dead = bitcast i32* %a to i4096*
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%dead1 = bitcast i4096* %dead to i42*
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%dead2 = getelementptr inbounds i32* %a, i32 %x
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; CHECK-NOT: bitcast
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; CHECK-NOT: getelementptr
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%ret = load i32* %a
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; CHECK-NOT: load
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ret i32 %ret
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; CHECK: ret i32 %x
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}
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