| ; RUN: opt -reassociate -S < %s | FileCheck %s | |
| ; PR21205 | |
| @a = common global i32 0, align 4 | |
| @b = common global i32 0, align 4 | |
| ; Don't canonicalize %conv - undef into %conv + (-undef). | |
| ; CHECK-LABEL: @test1 | |
| ; CHECK: %sub = fsub fast float %conv, undef | |
| ; CHECK: %sub1 = fadd fast float %sub, -1.000000e+00 | |
| define i32 @test1() { | |
| entry: | |
| %0 = load i32, i32* @a, align 4 | |
| %conv = sitofp i32 %0 to float | |
| %sub = fsub fast float %conv, undef | |
| %sub1 = fadd fast float %sub, -1.000000e+00 | |
| %conv2 = fptosi float %sub1 to i32 | |
| store i32 %conv2, i32* @b, align 4 | |
| ret i32 undef | |
| } |