1; RUN: llc < %s -enable-unsafe-fp-math -mtriple=x86_64-unknown-unknown -mcpu=corei7 | FileCheck %s 2 3; Make sure that vectors get the same benefits as scalars when using unsafe-fp-math. 4 5; Subtracting zero is free. 6define <4 x float> @vec_fsub_zero(<4 x float> %x) { 7; CHECK-LABEL: vec_fsub_zero: 8; CHECK-NOT: subps 9; CHECK-NOT: xorps 10; CHECK: retq 11 %sub = fsub <4 x float> %x, zeroinitializer 12 ret <4 x float> %sub 13} 14 15; Negating doesn't require subtraction. 16define <4 x float> @vec_fneg(<4 x float> %x) { 17; CHECK-LABEL: vec_fneg: 18; CHECK: xorps {{.*}}LCP{{.*}}, %xmm0 19; CHECK-NOT: subps 20; CHECK-NEXT: retq 21 %sub = fsub <4 x float> zeroinitializer, %x 22 ret <4 x float> %sub 23} 24