Simon Pilgrim 5ef0d1424c [TargetLowering] Add SimplifyMultipleUseDemandedBits ...

This patch introduces the DAG version of SimplifyMultipleUseDemandedBits, which attempts to peek through ops (mainly and/or/xor so far) that don't contribute to the demandedbits/elts of a node - which means we can do this even in cases where we have multiple uses of an op, which normally requires us to demanded all bits/elts. The intention is to remove a similar instruction - SelectionDAG::GetDemandedBits - once SimplifyMultipleUseDemandedBits has matured.

The InstCombine version of SimplifyMultipleUseDemandedBits can constant fold which I haven't added here yet, and so far I've only wired this up to some basic binops (and/or/xor/add/sub/mul) to demonstrate its use.

We do see a couple of regressions that need to be addressed:

    AMDGPU unsigned dot product codegen retains an AND mask (for ZERO_EXTEND) that it previously removed (but otherwise the dotproduct codegen is a lot better).
	
    X86/AVX2 has poor handling of vector ANY_EXTEND/ANY_EXTEND_VECTOR_INREG - it prematurely gets converted to ZERO_EXTEND_VECTOR_INREG.

The code owners have confirmed its ok for these cases to fixed up in future patches.

Differential Revision: https://reviews.llvm.org/D63281

llvm-svn: 366799

2019-07-23 12:39:08 +00:00

..

CMakeLists.txt

[LV][VPlan] Change to implement VPlan based predication for

2019-01-23 22:43:12 +00:00

LLVMBuild.txt

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

LoadStoreVectorizer.cpp

Delete dead stores

2019-07-12 14:58:15 +00:00

LoopVectorizationLegality.cpp

[LV] Suppress vectorization in some nontemporal cases

2019-06-17 17:20:08 +00:00

LoopVectorizationPlanner.h

[LV] Remove the redundant using LoopVectorizationPlanner:VPlanPtr

2019-05-30 18:46:13 +00:00

LoopVectorize.cpp

[LoopVectorize] Pass unfiltered list of arguments to getIntrinsicInstCost.

2019-07-15 08:48:47 +00:00

SLPVectorizer.cpp

[TargetLowering] Add SimplifyMultipleUseDemandedBits

2019-07-23 12:39:08 +00:00

Vectorize.cpp

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlan.cpp

[VPlan] Fix "value never used" static analyzer warning. NFCI.

2019-05-08 10:52:26 +00:00

VPlan.h

[LV][VPlan] Change to implement VPlan based predication for

2019-01-23 22:43:12 +00:00

VPlanDominatorTree.h

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanHCFGBuilder.cpp

Hide two unused debugging methods, NFCI.

2019-03-01 17:15:21 +00:00

VPlanHCFGBuilder.h

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanHCFGTransforms.cpp

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanHCFGTransforms.h

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanLoopInfo.h

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanPredicator.cpp

Update files that were mistakenly added with the old file header to the

2019-02-11 08:07:38 +00:00

VPlanPredicator.h

Update files that were mistakenly added with the old file header to the

2019-02-11 08:07:38 +00:00

VPlanSLP.cpp

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanValue.h

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanVerifier.cpp

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPlanVerifier.h

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19 08:50:56 +00:00

VPRecipeBuilder.h

[LV] Move getScalarizationOverhead and vector call cost computations to CM. (NFC)

2019-05-15 10:05:49 +00:00