| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| ; |
| ; This test makes sure that InstCombine does not replace the sequence of |
| ; xor/sub instruction followed by cmp instruction into a single cmp instruction |
| ; if there is more than one use of xor/sub. |
| |
| define zeroext i1 @test1(i32 %lhs, i32 %rhs) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: %xor = xor i32 %lhs, 5 |
| ; CHECK-NEXT: %cmp1 = icmp eq i32 %xor, 10 |
| |
| %xor = xor i32 %lhs, 5 |
| %cmp1 = icmp eq i32 %xor, 10 |
| %cmp2 = icmp eq i32 %xor, %rhs |
| %sel = or i1 %cmp1, %cmp2 |
| ret i1 %sel |
| } |
| |
| define zeroext i1 @test2(i32 %lhs, i32 %rhs) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: %xor = xor i32 %lhs, %rhs |
| ; CHECK-NEXT: %cmp1 = icmp eq i32 %xor, 0 |
| |
| %xor = xor i32 %lhs, %rhs |
| %cmp1 = icmp eq i32 %xor, 0 |
| %cmp2 = icmp eq i32 %xor, 32 |
| %sel = xor i1 %cmp1, %cmp2 |
| ret i1 %sel |
| } |
| |
| define zeroext i1 @test3(i32 %lhs, i32 %rhs) { |
| ; CHECK-LABEL: @test3( |
| ; CHECK-NEXT: %sub = sub nsw i32 %lhs, %rhs |
| ; CHECK-NEXT: %cmp1 = icmp eq i32 %sub, 0 |
| |
| %sub = sub nsw i32 %lhs, %rhs |
| %cmp1 = icmp eq i32 %sub, 0 |
| %cmp2 = icmp eq i32 %sub, 31 |
| %sel = or i1 %cmp1, %cmp2 |
| ret i1 %sel |
| } |