Sanjay Patel db231ebdb0 [InstCombine] fold fake vector extract to shift+trunc ...

We already handle more complicated cases like:
extelt (bitcast (inselt poison, X, 0)) --> trunc (lshr X)

But we missed this simpler pattern:
https://alive2.llvm.org/ce/z/D55h64 / https://alive2.llvm.org/ce/z/GKzzRq

This is part of solving:
https://llvm.org/PR52057

I made the transform depend on legal/desirable int type to avoid creating
a shift of an illegal type (for example i128). I'm not sure if that
restriction is actually necessary, but we can change that as a follow-up
if the backend can deal with integer ops on too-wide illegal types.

The pile of AVX512 test changes are all neutral AFAICT - the x86 backend
seems to know how to turn that into the expected "kmov" instructions.

Differential Revision: https://reviews.llvm.org/D111082

2021-10-06 08:12:05 -04:00

..

CMakeLists.txt

llvmbuildectomy - replace llvm-build by plain cmake

2020-11-13 10:35:24 +01:00

InstCombineAddSub.cpp

[APInt] Stop using soft-deprecated constructors and methods in llvm. NFC.

2021-10-04 08:57:44 +01:00

InstCombineAndOrXor.cpp

[InstCombine] add folds for logical nand/nor

2021-10-05 18:31:20 -04:00

InstCombineAtomicRMW.cpp

…

InstCombineCalls.cpp

[APInt] Stop using soft-deprecated constructors and methods in llvm. NFC.

2021-10-04 08:57:44 +01:00

InstCombineCasts.cpp

[APInt] Stop using soft-deprecated constructors and methods in llvm. NFC.

2021-10-04 08:57:44 +01:00

InstCombineCompares.cpp

[APInt] Stop using soft-deprecated constructors and methods in llvm. NFC.

2021-10-04 08:57:44 +01:00

InstCombineInternal.h

[InstCombine] fold fake vector extract to shift+trunc

2021-10-06 08:12:05 -04:00

InstCombineLoadStoreAlloca.cpp

[IR] Return AAMDNodes from Instruction::getMetadata() (NFC)

2021-09-16 21:06:57 +02:00

InstCombineMulDivRem.cpp

[APInt] Stop using soft-deprecated constructors and methods in llvm. NFC.

2021-10-04 08:57:44 +01:00

InstCombineNegator.cpp

[Transforms] Use range-based for loops (NFC)

2021-02-08 22:33:53 -08:00

InstCombinePHI.cpp

[InstCombine] Fold phi ( inttoptr/ptrtoint x ) to phi (x)

2021-08-03 17:52:59 +05:30

InstCombineSelect.cpp

[APInt] Stop using soft-deprecated constructors and methods in llvm. NFC.

2021-10-04 08:57:44 +01:00

InstCombineShifts.cpp

[InstCombine] fold (trunc (X>>C1)) << C to shift+mask directly

2021-10-01 14:22:44 -04:00

InstCombineSimplifyDemanded.cpp

[APInt] Stop using soft-deprecated constructors and methods in llvm. NFC.

2021-10-04 08:57:44 +01:00

InstCombineVectorOps.cpp

[InstCombine] fold fake vector extract to shift+trunc

2021-10-06 08:12:05 -04:00

InstructionCombining.cpp

[InstCombine] add helper for "is desirable int type"; NFC

2021-10-04 14:30:18 -04:00