Reapply r81171 with a fix: don't try to use i64 when it
isn't legal.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81492 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index f0c7086..15c2140 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -615,12 +615,27 @@
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;