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llvm-mirror/test/CodeGen/Generic/fneg-fabs.ll
Cameron McInally 3a2064d3a0 [IR] Add a dedicated FNeg IR Instruction
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
2018-11-13 18:15:47 +00:00

42 lines
995 B
LLVM

; RUN: llc < %s
define double @fneg(double %X) {
%Y = fsub double -0.000000e+00, %X ; <double> [#uses=1]
ret double %Y
}
define float @fnegf(float %X) {
%Y = fsub float -0.000000e+00, %X ; <float> [#uses=1]
ret float %Y
}
define double @real_fneg(double %X) {
%Y = fneg double %X ; <double> [#uses=1]
ret double %Y
}
define double @real_fneg_constant() {
%Y = fneg double -2.0 ; <double> [#uses=1]
ret double %Y
}
define float @real_fnegf(float %X) {
%Y = fneg float %X ; <float> [#uses=1]
ret float %Y
}
declare double @fabs(double)
declare float @fabsf(float)
define double @fabstest(double %X) {
%Y = call double @fabs( double %X ) ; <double> [#uses=1]
ret double %Y
}
define float @fabsftest(float %X) {
%Y = call float @fabsf( float %X ) ; <float> [#uses=1]
ret float %Y
}