1; RUN: opt -reassociate -S < %s | FileCheck %s
2; PR21205
3
4@a = common global i32 0, align 4
5@b = common global i32 0, align 4
6
7; Don't canonicalize %conv - undef into %conv + (-undef).
8; CHECK-LABEL: @test1
9; CHECK: %sub = fsub fast float %conv, undef
10; CHECK: %sub1 = fadd fast float %sub, -1.000000e+00
11
12define i32 @test1() {
13entry:
14  %0 = load i32, i32* @a, align 4
15  %conv = sitofp i32 %0 to float
16  %sub = fsub fast float %conv, undef
17  %sub1 = fadd fast float %sub, -1.000000e+00
18  %conv2 = fptosi float %sub1 to i32
19  store i32 %conv2, i32* @b, align 4
20  ret i32 undef
21}
22