llvm.org GIT mirror llvm / release_90 test / CodeGen / X86 / neg_fp.ll
release_90

Tree @release_90 (Download .tar.gz)

neg_fp.ll @release_90raw · history · blame

; RUN: llc < %s -mtriple=i686-- -mattr=+sse4.1 -o %t
; RUN: grep xorps %t | count 1

; Test that when we don't -enable-unsafe-fp-math, we don't do the optimization
; -0 - (A - B) to (B - A) because A==B, -0 != 0

define float @negfp(float %a, float %b) {
entry:
	%sub = fsub float %a, %b		; <float> [#uses=1]
	%neg = fsub float -0.000000e+00, %sub		; <float> [#uses=1]
	ret float %neg
}