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https://github.com/c64scene-ar/llvm-6502.git
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21f83a2f95
generates store to undef and some generates store to null as the idiom for undefined behavior. Since simplifycfg zaps both, don't remove the undefined behavior in instcombine. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89971 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
1.7 KiB
LLVM
86 lines
1.7 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define void @test1(i32* %P) {
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store i32 undef, i32* %P
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store i32 123, i32* undef
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store i32 124, i32* null
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ret void
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; CHECK: @test1(
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; CHECK-NEXT: store i32 123, i32* undef
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; CHECK-NEXT: store i32 undef, i32* null
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; CHECK-NEXT: ret void
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}
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define void @test2(i32* %P) {
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%X = load i32* %P ; <i32> [#uses=1]
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%Y = add i32 %X, 0 ; <i32> [#uses=1]
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store i32 %Y, i32* %P
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ret void
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; CHECK: @test2
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; CHECK-NEXT: ret void
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}
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;; Simple sinking tests
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; "if then else"
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define i32 @test3(i1 %C) {
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%A = alloca i32
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br i1 %C, label %Cond, label %Cond2
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Cond:
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store i32 -987654321, i32* %A
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br label %Cont
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Cond2:
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store i32 47, i32* %A
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br label %Cont
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Cont:
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%V = load i32* %A
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ret i32 %V
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; CHECK: @test3
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; CHECK-NOT: alloca
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; CHECK: Cont:
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; CHECK-NEXT: %storemerge = phi i32 [ 47, %Cond2 ], [ -987654321, %Cond ]
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; CHECK-NEXT: ret i32 %storemerge
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}
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; "if then"
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define i32 @test4(i1 %C) {
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%A = alloca i32
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store i32 47, i32* %A
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br i1 %C, label %Cond, label %Cont
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Cond:
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store i32 -987654321, i32* %A
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br label %Cont
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Cont:
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%V = load i32* %A
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ret i32 %V
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; CHECK: @test4
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; CHECK-NOT: alloca
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; CHECK: Cont:
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; CHECK-NEXT: %storemerge = phi i32 [ -987654321, %Cond ], [ 47, %0 ]
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; CHECK-NEXT: ret i32 %storemerge
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}
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; "if then"
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define void @test5(i1 %C, i32* %P) {
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store i32 47, i32* %P, align 1
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br i1 %C, label %Cond, label %Cont
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Cond:
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store i32 -987654321, i32* %P, align 1
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br label %Cont
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Cont:
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ret void
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; CHECK: @test5
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; CHECK: Cont:
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; CHECK-NEXT: %storemerge = phi i32
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; CHECK-NEXT: store i32 %storemerge, i32* %P, align 1
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; CHECK-NEXT: ret void
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}
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