Wenju He 79bf8c0331

[InstCombine] Fold select(X >s 0, 0, -X) | smax(X, 0) to abs(X) (#165200) ...

The IR pattern is compiled from OpenCL code:
  __builtin_astype(x > (uchar2)(0) ? x : -x, uchar2);
where smax is created by foldSelectInstWithICmp + canonicalizeSPF.

smax could also come from direct elementwise max call:
  int c = b > (int)(0) ? (int)(0) : -b;
  int d = __builtin_elementwise_max(b, (int)(0));
  *a = c | d;

https://alive2.llvm.org/ce/z/2-brvr
https://alive2.llvm.org/ce/z/Dowjzk
https://alive2.llvm.org/ce/z/kathwZ

---------

Co-authored-by: Yingwei Zheng <dtcxzyw@qq.com>
Co-authored-by: Matt Arsenault <arsenm2@gmail.com>

2025-11-03 07:38:21 +08:00

..

CMakeLists.txt

…

InstCombineAddSub.cpp

[InstCombine] Add support for ptrtoaddr in pointer difference folds (#164428)

2025-10-23 11:57:24 +02:00

InstCombineAndOrXor.cpp

[InstCombine] Fold select(X >s 0, 0, -X) | smax(X, 0) to abs(X) (#165200)

2025-11-03 07:38:21 +08:00

InstCombineAtomicRMW.cpp

[NFC][InstCombine] Fix namespace usage in InstCombine (#161902)

2025-10-04 05:28:24 -07:00

InstCombineCalls.cpp

[InstCombine] Support ptrtoaddr when converting to align assume bundle

2025-10-28 12:02:47 +01:00

InstCombineCasts.cpp

[InstCombine] Support ptrtoaddr of gep fold

2025-10-28 12:55:54 +01:00

InstCombineCompares.cpp

[InstCombine]: Canonicalize to a mask when trunc nuw (#163628)

2025-10-18 00:13:29 +08:00

InstCombineInternal.h

[InstCombine] Support ptrtoaddr of gep fold

2025-10-28 12:55:54 +01:00

InstCombineLoadStoreAlloca.cpp

InstCombine: Check GEP operand is available (#160438)

2025-09-25 17:20:20 +09:00

InstCombineMulDivRem.cpp

[InstCombine][VectorCombine][NFC] Unify uses of lossless inverse cast (#156597)

2025-09-08 13:30:06 +00:00

InstCombineNegator.cpp

[InstCombine] Optimize sub(sext(add(x,y)),sext(add(x,z))). (#144174)

2025-06-19 10:13:58 -07:00

InstCombinePHI.cpp

[NFC][LLVM] Use namespace qualifier to define DenseMapInfo specializations (#162683)

2025-10-10 05:23:44 -07:00

InstCombineSelect.cpp

[InstCombine] Fold shifts + selects with -1 to scmp(X, 0) (#164129)

2025-10-25 00:46:41 +08:00

InstCombineShifts.cpp

[NFC][InstCombine] Make use of unknown profile info clear in the API name (#162766)

2025-10-10 09:33:45 -07:00

InstCombineSimplifyDemanded.cpp

[InstCombine] Add the missing insertion point before IRBuilder instruction creation (#165315)

2025-10-27 17:00:42 -07:00

InstCombineVectorOps.cpp

[InstCombine] linearize complexity of findDemandedEltsByAllUsers() (#161436)

2025-10-01 12:08:49 -07:00

InstructionCombining.cpp

[InstCombine] Handle ptrtoaddr in gep of pointer sub fold (#164818)

2025-10-27 09:16:48 +01:00