[PATCH] D34723: [AMDGPU] truncate left shift
Stanislav Mekhanoshin via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Jun 27 17:16:11 PDT 2017
rampitec added inline comments.
================
Comment at: lib/Target/AMDGPU/AMDGPUISelLowering.cpp:2761-2762
+SDValue AMDGPUTargetLowering::performTruncCombine(SDNode *N,
+ DAGCombinerInfo &DCI) const {
+ EVT VT = N->getValueType(0);
----------------
rampitec wrote:
> arsenm wrote:
> > This exact combine is already done in DAGCombiner:
> >
> > // trunc (shl x, K) -> shl (trunc x), K => K < VT.getScalarSizeInBits()
> >
> > Why isn't it triggering? Is the other combine you added missing an AddToWorklist or something?
> Ah. That one only works with constants.
Do you want me to transfer it there?
https://reviews.llvm.org/D34723
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