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https://github.com/c64scene-ar/llvm-6502.git
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7d2cbd2d43
~x < ~y --> y < x -x == -y --> x == y git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50882 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.7 KiB
LLVM
55 lines
1.7 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep xor
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define i32 @test1(i32 %A) {
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%B = xor i32 %A, -1 ; <i32> [#uses=1]
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%C = xor i32 %B, -1 ; <i32> [#uses=1]
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ret i32 %C
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}
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define i1 @test2(i32 %A, i32 %B) {
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; Can change into setge
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%cond = icmp sle i32 %A, %B ; <i1> [#uses=1]
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%Ret = xor i1 %cond, true ; <i1> [#uses=1]
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ret i1 %Ret
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}
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; Test that demorgans law can be instcombined
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define i32 @test3(i32 %A, i32 %B) {
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%a = xor i32 %A, -1 ; <i32> [#uses=1]
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%b = xor i32 %B, -1 ; <i32> [#uses=1]
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%c = and i32 %a, %b ; <i32> [#uses=1]
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%d = xor i32 %c, -1 ; <i32> [#uses=1]
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ret i32 %d
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}
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; Test that demorgens law can work with constants
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define i32 @test4(i32 %A, i32 %B) {
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%a = xor i32 %A, -1 ; <i32> [#uses=1]
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%c = and i32 %a, 5 ; <i32> [#uses=1]
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%d = xor i32 %c, -1 ; <i32> [#uses=1]
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ret i32 %d
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}
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; test the mirror of demorgans law...
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define i32 @test5(i32 %A, i32 %B) {
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%a = xor i32 %A, -1 ; <i32> [#uses=1]
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%b = xor i32 %B, -1 ; <i32> [#uses=1]
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%c = or i32 %a, %b ; <i32> [#uses=1]
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%d = xor i32 %c, -1 ; <i32> [#uses=1]
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ret i32 %d
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}
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; PR2298
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define i8 @test6(i32 %a, i32 %b) zeroext nounwind {
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entry:
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%tmp1not = xor i32 %a, -1 ; <i32> [#uses=1]
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%tmp2not = xor i32 %b, -1 ; <i32> [#uses=1]
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%tmp3 = icmp slt i32 %tmp1not, %tmp2not ; <i1> [#uses=1]
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%retval67 = zext i1 %tmp3 to i8 ; <i8> [#uses=1]
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ret i8 %retval67
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}
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