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      1 ; RUN: llc < %s -march=x86 -mattr=+sse41 -o %t
      2 ; RUN: grep xorps %t | count 1
      3 
      4 ; Test that when we don't -enable-unsafe-fp-math, we don't do the optimization
      5 ; -0 - (A - B) to (B - A) because A==B, -0 != 0
      6 
      7 define float @negfp(float %a, float %b) {
      8 entry:
      9 	%sub = fsub float %a, %b		; <float> [#uses=1]
     10 	%neg = fsub float -0.000000e+00, %sub		; <float> [#uses=1]
     11 	ret float %neg
     12 }
     13