Yingwei Zheng 1220c9bafc [InstCombine] Fold the log2_ceil idiom (#76661) ...

This patch folds the `log2_ceil` idiom:
```
(BW - ctlz(A)) + (is_power2(A) ? 0 : 1) ->
zext(ctpop(A) >u/!= 1) + (ctlz(A, true) ^ (BW - 1)) (canonical form) ->
BW - ctlz(A - 1, false)
```

Alive2: https://alive2.llvm.org/ce/z/6mSbdi

2024-01-10 20:24:20 +08:00

..

CMakeLists.txt

…

InstCombineAddSub.cpp

[InstCombine] Fold the log2_ceil idiom (#76661)

2024-01-10 20:24:20 +08:00

InstCombineAndOrXor.cpp

[InstCombine] Fold bitwise logic with intrinsics (#77460)

2024-01-10 19:33:18 +08:00

InstCombineAtomicRMW.cpp

…

InstCombineCalls.cpp

[InstCombine] Dont throw away noalias/alias scope metadata when inlining memcpys (#74805)

2024-01-04 17:04:31 +01:00

InstCombineCasts.cpp

[ValueTracking] Convert isKnownNonNegative() to use SimplifyQuery (NFC)

2023-11-29 10:52:52 +01:00

InstCombineCompares.cpp

[InstCombine] Relax the one-use constraints for icmp pred (binop X, Z), (binop Y, Z) (#76384)

2024-01-07 20:16:12 +08:00

InstCombineInternal.h

[InstCombine] Refactor folding of commutative binops over select/phi/minmax (#76692)

2024-01-04 15:11:28 +08:00

InstCombineLoadStoreAlloca.cpp

[InstCombine] Preserve inalloca tag when transforming alloca

2023-12-11 14:27:00 +01:00

InstCombineMulDivRem.cpp

[InstCombine] Refactor folding of commutative binops over select/phi/minmax (#76692)

2024-01-04 15:11:28 +08:00

InstCombineNegator.cpp

[Transforms] Remove unused forward declarations (NFC)

2023-12-10 10:07:12 -08:00

InstCombinePHI.cpp

[InstCombine] Fix phi or icmp fold with disjoint flag

2023-11-30 16:23:00 +01:00

InstCombineSelect.cpp

[InstCombine] Remove unused variables in InstCombineSelect.cpp (NFC)

2023-12-31 18:40:26 +08:00

InstCombineShifts.cpp

[InstCombine][InstSimplify] Pass SimplifyQuery to computeKnownBits directly. NFC. (#74246)

2023-12-04 02:26:39 +08:00

InstCombineSimplifyDemanded.cpp

[InstCombine] Return poison if all lanes are poison

2023-12-19 12:43:23 +01:00

InstCombineVectorOps.cpp

[InstCombine] Preserve poison in bitcast of insertelement fold

2023-12-19 13:06:04 +01:00

InstructionCombining.cpp

[InstCombine] Fold switch(zext/sext(X)) into switch(X) (#76988)

2024-01-06 04:30:07 +08:00