Sanjay Patel 16150b3947 [InstCombine] canonicalize vector select with constant vector condition to shuffle ...

As discussed on llvm-dev ( http://lists.llvm.org/pipermail/llvm-dev/2016-August/104210.html ): 
turn a vector select with constant condition operand into a shuffle as a canonicalization step.
Shuffles may be easier to reason about in conjunction with other shuffles and insert/extract.

Possible known (minor?) regressions from this change are filed as:
https://llvm.org/bugs/show_bug.cgi?id=28530 
https://llvm.org/bugs/show_bug.cgi?id=28531 
https://llvm.org/bugs/show_bug.cgi?id=30371

If something terrible happens to perf after this commit, feel free to revert until a backend
fix is in place.

Differential Revision: https://reviews.llvm.org/D24279


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281787 91177308-0d34-0410-b5e6-96231b3b80d8

2016-09-16 22:16:18 +00:00

..

CMakeLists.txt

Use ADDITIONAL_HEADER_DIRS in all LLVM CMake projects.

2015-02-11 03:28:02 +00:00

InstCombineAddSub.cpp

InstCombine: Replace some never-null pointers with references. NFC

2016-08-05 01:06:44 +00:00

InstCombineAndOrXor.cpp

[InstCombine] add helper function for folding {and,or,xor} (cast X), C ; NFCI

2016-09-12 00:16:23 +00:00

InstCombineCalls.cpp

[InstCombine][SSE4a] Fix assertion failure in the insertq/insertqi combining logic.

2016-09-07 12:47:53 +00:00

InstCombineCasts.cpp

Reapply "InstCombine: Reduce trunc (shl x, K) width."

2016-09-13 19:43:57 +00:00

InstCombineCompares.cpp

[InstCombine] add helper functions for visitICmpInst(); NFCI

2016-09-16 16:10:22 +00:00

InstCombineInternal.h

[InstCombine] add helper functions for visitICmpInst(); NFCI

2016-09-16 16:10:22 +00:00

InstCombineLoadStoreAlloca.cpp

InstCombine: Don't combine loads/stores from swifterror to a new type

2016-09-10 18:14:57 +00:00

InstCombineMulDivRem.cpp

InstCombine: Replace some never-null pointers with references. NFC

2016-08-05 01:06:44 +00:00

InstCombinePHI.cpp

Use the range variant of find/find_if instead of unpacking begin/end

2016-08-12 03:55:06 +00:00

InstCombineSelect.cpp

[InstCombine] canonicalize vector select with constant vector condition to shuffle

2016-09-16 22:16:18 +00:00

InstCombineShifts.cpp

Replace a few more "fall through" comments with LLVM_FALLTHROUGH

2016-08-17 20:30:52 +00:00

InstCombineSimplifyDemanded.cpp

don't repeat function names in comments; NFC

2016-07-14 20:54:43 +00:00

InstCombineVectorOps.cpp

[InsttCombine] fold insertelement of constant into shuffle with constant operand (PR29126)

2016-09-02 17:05:43 +00:00

InstructionCombining.cpp

[InstCombine] allow vector types for constant folding / computeKnownBits (PR24942)

2016-09-16 21:20:36 +00:00

LLVMBuild.txt

Update libdeps since TLI was moved from Target to Analysis in r226078.

2015-01-15 05:21:00 +00:00