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[X86] Cleanup a comment around bitcasting X86ISD::VBROADCAST_LOAD and add an assert to make sure memory VT size doesn't change.

This commit is contained in:
Craig Topper 2020-02-27 21:29:52 -08:00
parent 0b6abe4281
commit b68eeff05c
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -37138,10 +37138,12 @@ static SDValue combineBitcast(SDNode *N, SelectionDAG &DAG,
DAG.getBitcast(MVT::i16, N0.getOperand(0)));
// Combine (bitcast (vbroadcast_load)) -> (vbroadcast_load). The memory VT
// determines // the number of bits loaded. Remaining bits are zero.
// determines the number of bits loaded.
if (N0.getOpcode() == X86ISD::VBROADCAST_LOAD && N0.hasOneUse() &&
VT.getScalarSizeInBits() == SrcVT.getScalarSizeInBits()) {
auto *BCast = cast<MemIntrinsicSDNode>(N0);
assert(VT.getScalarSizeInBits() == BCast->getMemoryVT().getSizeInBits() &&
"Unexpected load size!");
SDVTList Tys = DAG.getVTList(VT, MVT::Other);
SDValue Ops[] = { BCast->getChain(), BCast->getBasePtr() };
SDValue ResNode =