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[GlobalISel] Fix G_SEXT narrowScalar to bail out of unsupported type combination. 

Similar to the issue with G_ZEXT that was fixed earlier, this is a quick
to fall back if the source type is not exactly half of the dest type.

Fixes the clang-cmake-aarch64-lld bot build.

llvm-svn: 370847
This commit is contained in:
Amara Emerson 2019-09-04 07:58:45 +00:00
parent 418a272f4a
commit 5d5150f0b4
1 changed files with 7 additions and 3 deletions
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10
llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
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@ -619,13 +619,17 @@ LegalizerHelper::LegalizeResult LegalizerHelper::narrowScalar(MachineInstr &MI,
if (TypeIdx != 0)
return UnableToLegalize;
if (NarrowTy.getSizeInBits() != SizeOp0 / 2) {
Register SrcReg = MI.getOperand(1).getReg();
LLT SrcTy = MRI.getType(SrcReg);
// FIXME: support the general case where the requested NarrowTy may not be
// the same as the source type. E.g. s128 = sext(s32)
if ((SrcTy.getSizeInBits() != SizeOp0 / 2) ||
SrcTy.getSizeInBits() != NarrowTy.getSizeInBits()) {
LLVM_DEBUG(dbgs() << "Can't narrow sext to type " << NarrowTy << "\n");
return UnableToLegalize;
}
Register SrcReg = MI.getOperand(1).getReg();
// Shift the sign bit of the low register through the high register.
auto ShiftAmt =
MIRBuilder.buildConstant(LLT::scalar(64), NarrowTy.getSizeInBits() - 1);