1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=fma -enable-unsafe-fp-math | FileCheck %s 3 4; If fast-math-flags are propagated correctly, the mul1 expression 5; should be recognized as a factor in the last fsub, so we should 6; see a mul and add, not a mul and fma: 7; a * b - (-a * b) ---> (a * b) + (a * b) 8 9define float @fmf_should_not_break_cse(float %a, float %b) { 10; CHECK-LABEL: fmf_should_not_break_cse: 11; CHECK: # %bb.0: 12; CHECK-NEXT: vmulss %xmm1, %xmm0, %xmm0 13; CHECK-NEXT: vaddss %xmm0, %xmm0, %xmm0 14; CHECK-NEXT: retq 15 %mul1 = fmul fast float %a, %b 16 %nega = fsub fast float 0.0, %a 17 %mul2 = fmul fast float %nega, %b 18 %abx2 = fsub fast float %mul1, %mul2 19 ret float %abx2 20} 21 22define <4 x float> @fmf_should_not_break_cse_vector(<4 x float> %a, <4 x float> %b) { 23; CHECK-LABEL: fmf_should_not_break_cse_vector: 24; CHECK: # %bb.0: 25; CHECK-NEXT: vmulps %xmm1, %xmm0, %xmm0 26; CHECK-NEXT: vaddps %xmm0, %xmm0, %xmm0 27; CHECK-NEXT: retq 28 %mul1 = fmul fast <4 x float> %a, %b 29 %nega = fsub fast <4 x float> <float 0.0, float 0.0, float 0.0, float 0.0>, %a 30 %mul2 = fmul fast <4 x float> %nega, %b 31 %abx2 = fsub fast <4 x float> %mul1, %mul2 32 ret <4 x float> %abx2 33} 34