| ; This test makes sure that these instructions are properly eliminated. |
| ; |
| |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| ; CHECK-NOT: xor |
| |
| define i32 @test1(i32 %A) { |
| %B = xor i32 %A, -1 |
| %C = xor i32 %B, -1 |
| ret i32 %C |
| } |
| |
| define i1 @test2(i32 %A, i32 %B) { |
| ; Can change into setge |
| %cond = icmp sle i32 %A, %B |
| %Ret = xor i1 %cond, true |
| ret i1 %Ret |
| } |
| |
| ; Test that De Morgan's law can be instcombined. |
| define i32 @test3(i32 %A, i32 %B) { |
| %a = xor i32 %A, -1 |
| %b = xor i32 %B, -1 |
| %c = and i32 %a, %b |
| %d = xor i32 %c, -1 |
| ret i32 %d |
| } |
| |
| ; Test that De Morgan's law can work with constants. |
| define i32 @test4(i32 %A, i32 %B) { |
| %a = xor i32 %A, -1 |
| %c = and i32 %a, 5 |
| %d = xor i32 %c, -1 |
| ret i32 %d |
| } |
| |
| ; Test the mirror of De Morgan's law. |
| define i32 @test5(i32 %A, i32 %B) { |
| %a = xor i32 %A, -1 |
| %b = xor i32 %B, -1 |
| %c = or i32 %a, %b |
| %d = xor i32 %c, -1 |
| ret i32 %d |
| } |
| |
| ; PR2298 |
| define zeroext i8 @test6(i32 %a, i32 %b) { |
| entry: |
| %tmp1not = xor i32 %a, -1 |
| %tmp2not = xor i32 %b, -1 |
| %tmp3 = icmp slt i32 %tmp1not, %tmp2not |
| %retval67 = zext i1 %tmp3 to i8 |
| ret i8 %retval67 |
| } |
| |
| define <2 x i1> @test7(<2 x i32> %A, <2 x i32> %B) { |
| %cond = icmp sle <2 x i32> %A, %B |
| %Ret = xor <2 x i1> %cond, <i1 true, i1 true> |
| ret <2 x i1> %Ret |
| } |
| |