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[X86] Remove unnecessary TODO.

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When I wrote it I thought we were missing a potential optimization for KNL. But investigating further shows that for KNL we still do the optimal thing by widening to v4f32 and then using special isel patterns to widen again to zmm a register.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320862 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2017-12-15 20:57:18 +00:00
parent aaef0e44b9
commit 6be8b9966d
1 changed files with 0 additions and 1 deletions
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lib/Target/X86/X86ISelLowering.cpp
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@ -1566,7 +1566,6 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
setTruncStoreAction(MVT::v4i32, MVT::v4i16, Legal);
if (Subtarget.hasDQI()) {
// TODO: these shouldn't require VLX. We can widen to 512-bit with AVX512F.
// Fast v2f32 SINT_TO_FP( v2i64 ) custom conversion.
// v2f32 UINT_TO_FP is already custom under SSE2.
setOperationAction(ISD::SINT_TO_FP, MVT::v2f32, Custom);