[PATCH] D72467: [WIP] Remove "mask" operand from shufflevector.

[Eli Friedman via Phabricator via llvm-commits]

efriedma marked an inline comment as done.
efriedma added inline comments.


================
Comment at: llvm/lib/Analysis/InstructionSimplify.cpp:4413
                                         unsigned MaxRecurse) {
-  if (isa<UndefValue>(Mask))
+  if (all_of(Mask, [](int Elem) { return Elem == -1; }))
     return UndefValue::get(RetTy);
----------------
xbolva00 wrote:
> maybe introduce new helper function to check if mask is "undef"?
I could introduce ShuffleVectorInst::MaskIsAllUndef and ShuffleVectorInst::MaskIsAllZero, I guess.  Not sure how helpful that actually is for a predicate that can be expressed on one line anyway.


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  https://reviews.llvm.org/D72467/new/

https://reviews.llvm.org/D72467