unsigned OpReg = getRegForValue(BinaryOperator::getFNegArgument(I));
if (OpReg == 0) return false;
- // Bitcast the value to integer, twiddle the sign bit with xor,
- // and then bitcast it back to floating-point.
+ // Twiddle the sign bit with xor.
EVT VT = TLI.getValueType(I->getType());
if (VT.getSizeInBits() > 64) return false;
- EVT IntVT = EVT::getIntegerVT(I->getContext(), VT.getSizeInBits());
-
- unsigned IntReg = FastEmit_r(VT.getSimpleVT(), IntVT.getSimpleVT(),
- ISD::BIT_CONVERT, OpReg);
- if (IntReg == 0)
- return false;
-
- unsigned IntResultReg = FastEmit_ri_(IntVT.getSimpleVT(), ISD::XOR, IntReg,
- UINT64_C(1) << (VT.getSizeInBits()-1),
- IntVT.getSimpleVT());
- if (IntResultReg == 0)
- return false;
-
- unsigned ResultReg = FastEmit_r(IntVT.getSimpleVT(), VT.getSimpleVT(),
- ISD::BIT_CONVERT, IntResultReg);
+ unsigned ResultReg = FastEmit_ri_(VT.getSimpleVT(), ISD::XOR, OpReg,
+ UINT64_C(1) << (VT.getSizeInBits()-1),
+ VT.getSimpleVT());
if (ResultReg == 0)
return false;
-; RUN: llc < %s -fast-isel -fast-isel-abort -march=x86-64 | FileCheck %s
+; RUN: llc < %s -fast-isel -march=x86-64 | FileCheck %s
; CHECK: doo:
-; CHECK: xor
+; CHECK: xorpd
define double @doo(double %x) nounwind {
%y = fsub double -0.0, %x
ret double %y
}
; CHECK: foo:
-; CHECK: xor
+; CHECK: xorps
define float @foo(float %x) nounwind {
%y = fsub float -0.0, %x
ret float %y