Make fast-isel try ISD::FNEG before resorting to bitcasts and xors.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81493 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 15c2140..54544a4 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -615,9 +615,17 @@
unsigned OpReg = getRegForValue(BinaryOperator::getFNegArgument(I));
if (OpReg == 0) return false;
+ // If the target has ISD::FNEG, use it.
+ EVT VT = TLI.getValueType(I->getType());
+ unsigned ResultReg = FastEmit_r(VT.getSimpleVT(), VT.getSimpleVT(),
+ ISD::FNEG, OpReg);
+ if (ResultReg != 0) {
+ UpdateValueMap(I, ResultReg);
+ return true;
+ }
+
// 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;
EVT IntVT = EVT::getIntegerVT(I->getContext(), VT.getSizeInBits());
if (!TLI.isTypeLegal(IntVT))