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[InstSimplify] Move masked.gather w/no active lanes handling to InstSimplify from InstCombine

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In the process, use the existing masked.load combine which is slightly stronger, and handles a mix of zero and undef elements in the mask.  

llvm-svn: 358913
This commit is contained in:
Philip Reames 2019-04-22 19:30:01 +00:00
parent 56f4e6ed4f
commit 0e2498cde5
2 changed files with 2 additions and 6 deletions
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3
lib/Analysis/InstructionSimplify.cpp
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@ -4876,7 +4876,8 @@ static Value *simplifyIntrinsic(Function *F, IterTy ArgBegin, IterTy ArgEnd,
// Handle intrinsics with 3 or more arguments.
switch (IID) {
case Intrinsic::masked_load: {
case Intrinsic::masked_load:
case Intrinsic::masked_gather: {
Value *MaskArg = ArgBegin[2];
Value *PassthruArg = ArgBegin[3];
// If the mask is all zeros or undef, the "passthru" argument is the result.

5
lib/Transforms/InstCombine/InstCombineCalls.cpp
View File

@ -1220,11 +1220,6 @@ Instruction *InstCombiner::simplifyMaskedStore(IntrinsicInst &II) {
// * Vector splat address w/known mask -> scalar load
// * Vector incrementing address -> vector masked load
static Instruction *simplifyMaskedGather(IntrinsicInst &II, InstCombiner &IC) {
// If the mask is all zeros, return the "passthru" argument of the gather.
auto *ConstMask = dyn_cast<Constant>(II.getArgOperand(2));
if (ConstMask && ConstMask->isNullValue())
return IC.replaceInstUsesWith(II, II.getArgOperand(3));
return nullptr;
}