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[AVX-512] Punt on fast-isel of truncates to i1 when AVX512 is enabled.

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We should be masking the value and emitting a register copy like we do in non-fast isel. Instead we were just updating the value map and emitting nothing.

After r298928 we started seeing cases where we would create a copy from GR8 to GR32 because the source register in a VK1 to GR32 copy was replaced by the GR8 going into a truncate.

This fixes PR32451.

llvm-svn: 298957
This commit is contained in:
Craig Topper 2017-03-28 23:20:37 +00:00
parent 299bb34210
commit c62d4ea689
1 changed files with 2 additions and 1 deletions
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3
lib/Target/X86/X86FastISel.cpp
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@ -2512,7 +2512,8 @@ bool X86FastISel::X86SelectTrunc(const Instruction *I) {
EVT DstVT = TLI.getValueType(DL, I->getType());
// This code only handles truncation to byte.
if (DstVT != MVT::i8 && DstVT != MVT::i1)
// TODO: Support truncate to i1 with AVX512.
if (DstVT != MVT::i8 && (DstVT != MVT::i1 || Subtarget->hasAVX512()))
return false;
if (!TLI.isTypeLegal(SrcVT))
return false;