forked from OSchip/llvm-project
62 lines
1.4 KiB
LLVM
62 lines
1.4 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; CHECK-NOT: xor
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define i32 @test1(i32 %A) {
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%B = xor i32 %A, -1
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%C = xor i32 %B, -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
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%Ret = xor i1 %cond, true
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ret i1 %Ret
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}
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; Test that De Morgan's law can be instcombined.
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define i32 @test3(i32 %A, i32 %B) {
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%a = xor i32 %A, -1
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%b = xor i32 %B, -1
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%c = and i32 %a, %b
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%d = xor i32 %c, -1
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ret i32 %d
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}
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; Test that De Morgan's 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
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%c = and i32 %a, 5
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%d = xor i32 %c, -1
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ret i32 %d
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}
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; Test the mirror of De Morgan's law.
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define i32 @test5(i32 %A, i32 %B) {
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%a = xor i32 %A, -1
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%b = xor i32 %B, -1
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%c = or i32 %a, %b
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%d = xor i32 %c, -1
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ret i32 %d
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}
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; PR2298
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define zeroext i8 @test6(i32 %a, i32 %b) {
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entry:
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%tmp1not = xor i32 %a, -1
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%tmp2not = xor i32 %b, -1
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%tmp3 = icmp slt i32 %tmp1not, %tmp2not
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%retval67 = zext i1 %tmp3 to i8
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ret i8 %retval67
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}
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define <2 x i1> @test7(<2 x i32> %A, <2 x i32> %B) {
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%cond = icmp sle <2 x i32> %A, %B
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%Ret = xor <2 x i1> %cond, <i1 true, i1 true>
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ret <2 x i1> %Ret
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}
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