1 ; This test makes sure that these instructions are properly eliminated. 2 ; 3 4 ; RUN: opt < %s -instcombine -S | FileCheck %s 5 ; CHECK-NOT: xor 6 7 define i32 @test1(i32 %A) { 8 %B = xor i32 %A, -1 9 %C = xor i32 %B, -1 10 ret i32 %C 11 } 12 13 define i1 @test2(i32 %A, i32 %B) { 14 ; Can change into setge 15 %cond = icmp sle i32 %A, %B 16 %Ret = xor i1 %cond, true 17 ret i1 %Ret 18 } 19 20 ; Test that De Morgan's law can be instcombined. 21 define i32 @test3(i32 %A, i32 %B) { 22 %a = xor i32 %A, -1 23 %b = xor i32 %B, -1 24 %c = and i32 %a, %b 25 %d = xor i32 %c, -1 26 ret i32 %d 27 } 28 29 ; Test that De Morgan's law can work with constants. 30 define i32 @test4(i32 %A, i32 %B) { 31 %a = xor i32 %A, -1 32 %c = and i32 %a, 5 33 %d = xor i32 %c, -1 34 ret i32 %d 35 } 36 37 ; Test the mirror of De Morgan's law. 38 define i32 @test5(i32 %A, i32 %B) { 39 %a = xor i32 %A, -1 40 %b = xor i32 %B, -1 41 %c = or i32 %a, %b 42 %d = xor i32 %c, -1 43 ret i32 %d 44 } 45 46 ; PR2298 47 define zeroext i8 @test6(i32 %a, i32 %b) { 48 entry: 49 %tmp1not = xor i32 %a, -1 50 %tmp2not = xor i32 %b, -1 51 %tmp3 = icmp slt i32 %tmp1not, %tmp2not 52 %retval67 = zext i1 %tmp3 to i8 53 ret i8 %retval67 54 } 55 56 define <2 x i1> @test7(<2 x i32> %A, <2 x i32> %B) { 57 %cond = icmp sle <2 x i32> %A, %B 58 %Ret = xor <2 x i1> %cond, <i1 true, i1 true> 59 ret <2 x i1> %Ret 60 } 61 62
