forked from OSchip/llvm-project
55 lines
1.9 KiB
LLVM
55 lines
1.9 KiB
LLVM
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; RUN: opt -S -instsimplify < %s | FileCheck %s
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target datalayout = "p:32:32"
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define i1 @test1(i1 %V) {
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entry:
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%Z = zext i1 %V to i32
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%T = trunc i32 %Z to i1
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ret i1 %T
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; CHECK-LABEL: define i1 @test1(
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; CHECK: ret i1 %V
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}
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define i8* @test2(i8* %V) {
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entry:
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%BC1 = bitcast i8* %V to i32*
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%BC2 = bitcast i32* %BC1 to i8*
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ret i8* %BC2
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; CHECK-LABEL: define i8* @test2(
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; CHECK: ret i8* %V
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}
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define i8* @test3(i8* %V) {
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entry:
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%BC = bitcast i8* %V to i8*
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ret i8* %BC
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; CHECK-LABEL: define i8* @test3(
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; CHECK: ret i8* %V
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}
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define i32 @test4() {
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; CHECK-LABEL: @test4(
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%alloca = alloca i32, align 4 ; alloca + 0
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%gep = getelementptr inbounds i32, i32* %alloca, i32 1 ; alloca + 4
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%bc = bitcast i32* %gep to [4 x i8]* ; alloca + 4
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%pti = ptrtoint i32* %alloca to i32 ; alloca
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%sub = sub i32 0, %pti ; -alloca
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%add = getelementptr [4 x i8], [4 x i8]* %bc, i32 0, i32 %sub ; alloca + 4 - alloca == 4
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%add_to_int = ptrtoint i8* %add to i32 ; 4
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ret i32 %add_to_int ; 4
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; CHECK-NEXT: ret i32 4
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}
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define i32 @test5() {
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; CHECK-LABEL: @test5(
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%alloca = alloca i32, align 4 ; alloca + 0
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%gep = getelementptr inbounds i32, i32* %alloca, i32 1 ; alloca + 4
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%bc = bitcast i32* %gep to [4 x i8]* ; alloca + 4
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%pti = ptrtoint i32* %alloca to i32 ; alloca
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%sub = xor i32 %pti, -1 ; ~alloca
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%add = getelementptr [4 x i8], [4 x i8]* %bc, i32 0, i32 %sub ; alloca + 4 - alloca - 1 == 3
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%add_to_int = ptrtoint i8* %add to i32 ; 4
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ret i32 %add_to_int ; 4
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; CHECK-NEXT: ret i32 3
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}
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