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Reapply r81171 with a fix: don't try to use i64 when it

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isn't legal.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81492 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-09-11 00:34:46 +00:00
parent c24edfaee2
commit 5e5abb77fe
2 changed files with 23 additions and 7 deletions
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23
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -615,12 +615,27 @@ FastISel::SelectFNeg(User *I) {
unsigned OpReg = getRegForValue(BinaryOperator::getFNegArgument(I));
if (OpReg == 0) return false;
// Twiddle the sign bit with xor.
// Bitcast the value to integer, twiddle the sign bit with xor,
// and then bitcast it back to floating-point.
EVT VT = TLI.getValueType(I->getType());
if (VT.getSizeInBits() > 64) return false;
unsigned ResultReg = FastEmit_ri_(VT.getSimpleVT(), ISD::XOR, OpReg,
UINT64_C(1) << (VT.getSizeInBits()-1),
VT.getSimpleVT());
EVT IntVT = EVT::getIntegerVT(I->getContext(), VT.getSizeInBits());
if (!TLI.isTypeLegal(IntVT))
return false;
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;
ResultReg = FastEmit_r(IntVT.getSimpleVT(), VT.getSimpleVT(),
ISD::BIT_CONVERT, IntResultReg);
if (ResultReg == 0)
return false;

7
test/CodeGen/X86/fast-isel-fneg.ll
View File

@ -1,14 +1,15 @@
; RUN: llc < %s -fast-isel -march=x86-64 | FileCheck %s
; RUN: llc < %s -fast-isel -fast-isel-abort -march=x86-64 | FileCheck %s
; RUN: llc < %s -fast-isel -march=x86 | grep xor | count 2
; CHECK: doo:
; CHECK: xorpd
; CHECK: xor
define double @doo(double %x) nounwind {
%y = fsub double -0.0, %x
ret double %y
}
; CHECK: foo:
; CHECK: xorps
; CHECK: xor
define float @foo(float %x) nounwind {
%y = fsub float -0.0, %x
ret float %y