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3a2064d3a0
The IEEE-754 Standard makes it clear that fneg(x) and fsub(-0.0, x) are two different operations. The former is a bitwise operation, while the latter is an arithmetic operation. This patch creates a dedicated FNeg IR Instruction to model that behavior. Differential Revision: https://reviews.llvm.org/D53877 llvm-svn: 346774
42 lines
995 B
LLVM
42 lines
995 B
LLVM
; RUN: llc < %s
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define double @fneg(double %X) {
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%Y = fsub double -0.000000e+00, %X ; <double> [#uses=1]
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ret double %Y
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}
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define float @fnegf(float %X) {
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%Y = fsub float -0.000000e+00, %X ; <float> [#uses=1]
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ret float %Y
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}
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define double @real_fneg(double %X) {
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%Y = fneg double %X ; <double> [#uses=1]
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ret double %Y
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}
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define double @real_fneg_constant() {
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%Y = fneg double -2.0 ; <double> [#uses=1]
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ret double %Y
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}
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define float @real_fnegf(float %X) {
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%Y = fneg float %X ; <float> [#uses=1]
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ret float %Y
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}
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declare double @fabs(double)
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declare float @fabsf(float)
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define double @fabstest(double %X) {
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%Y = call double @fabs( double %X ) ; <double> [#uses=1]
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ret double %Y
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}
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define float @fabsftest(float %X) {
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%Y = call float @fabsf( float %X ) ; <float> [#uses=1]
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ret float %Y
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}
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