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llvm-6502/test/CodeGen/X86/neg_fp.ll
Mon P Wang a7b6cff99f If unsafe FP optimization is not set, don't allow -(A-B) => B-A because
when A==B, -0.0 != +0.0.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63474 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-31 06:07:45 +00:00

12 lines
391 B
LLVM

; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse41 -o %t -f
; 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 = sub float %a, %b ; <float> [#uses=1]
%neg = sub float -0.000000e+00, %sub ; <float> [#uses=1]
ret float %neg
}