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5 Commits

Author SHA1 Message Date
Juneyoung Lee 1c10201d96 Update InstCombine to use undef matcher instead 
This is a patch to use m_Undef() matcher instead of isa<UndefValue>().

As suggested in D100122, this update is separately committed.
 2021-04-18 11:05:36 +09:00
Juneyoung Lee 8871a4b4ca [Constant] Update ConstantVector::get to return poison if all input elems are poison 
The diff was reviewed at D93994
 2021-01-07 09:26:07 +09:00
Juneyoung Lee 278aa65cc4 [IR] Let IRBuilder's CreateVectorSplat/CreateShuffleVector use poison as placeholder 
This patch updates IRBuilder to create insertelement/shufflevector using poison as a placeholder.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D93793
 2020-12-30 04:21:04 +09:00
Simon Pilgrim 5dc4e7c2b9 [VectorCombine] scalarizeBinop - support an all-constant src vector operand 
scalarizeBinop currently folds

  vec_bo((inselt VecC0, V0, Index), (inselt VecC1, V1, Index))
  ->
  inselt(vec_bo(VecC0, VecC1), scl_bo(V0,V1), Index)

This patch extends this to account for cases where one of the vec_bo operands is already all-constant and performs similar cost checks to determine if the scalar binop with a constant still makes sense:

  vec_bo((inselt VecC0, V0, Index), VecC1)
  ->
  inselt(vec_bo(VecC0, VecC1), scl_bo(V0,extractelt(V1,Index)), Index)

Fixes PR42174

Differential Revision: https://reviews.llvm.org/D80885
 2020-06-09 19:02:05 +01:00
Sanjay Patel 129c501aa9 [PhaseOrdering] add scalarization test for PR42174; NFC 
Motivating test for vector-combine enhancement in D80885.
Make sure that vectorization and canonicalization are
working together as expected.
 2020-05-31 08:43:34 -04:00