hanbeom 8d2078332c

[InstCombine] Shrink added constant using LHS known zeros (#174380) ...

Previously, `SimplifyDemandedUseBits` for `add` instructions only
used known zeros from the RHS to simplify the LHS. It failed to
handle the symmetric case where the LHS has known zeros and the
result does not demand the low bits.

This patch implements this missing optimization, allowing the RHS
constant to be shrunk when the LHS low bits are known zero and unused.

Proof: https://alive2.llvm.org/ce/z/6v9iFY
Fixed: https://github.com/llvm/llvm-project/issues/135411

2026-02-07 20:41:58 +09:00

..

CMakeLists.txt

…

InstCombineAddSub.cpp

[InstCombine] Preserve fdiv metadata on fneg folds (#179157)

2026-02-03 08:27:18 +08:00

InstCombineAndOrXor.cpp

[profcheck][InstCombine] Fix missing profile data identified by not.ll test (#176497)

2026-01-21 10:06:29 -08:00

InstCombineAtomicRMW.cpp

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

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

InstCombineCalls.cpp

[InstCombine][profcheck] Fix profile metadata propagation for umax in InstCombine (#179332)

2026-02-05 21:09:06 -08:00

InstCombineCasts.cpp

[InstCombine] Support multi-use values in cast elimination transforms (#165877)

2025-11-25 17:43:26 +00:00

InstCombineCompares.cpp

[InstCombine] Limit (icmp eq/ne (and (add A, Addend), Msk), C) fold to one use of and (#172858)

2026-02-07 03:09:27 +08:00

InstCombineInternal.h

[InstCombine] Fold select of intrinsic into intrinsic of select (#178002)

2026-02-03 17:44:34 +01:00

InstCombineLoadStoreAlloca.cpp

[InstCombine] Replace getAllocatedType() with getAllocationSize() (#177435)

2026-01-26 22:31:29 -05:00

InstCombineMulDivRem.cpp

[InstCombine][profcheck] Fix profile metadata propagation in takeLog2 (#179331)

2026-02-05 19:20:32 -08:00

InstCombineNegator.cpp

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

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

InstCombinePHI.cpp

[IR][InstCombine] Fix O(n^2) complexity in SliceUpIllegalIntegerPHI (#175468)

2026-01-12 20:59:58 +00:00

InstCombineSelect.cpp

[InstCombine] Fold select of intrinsic into intrinsic of select (#178002)

2026-02-03 17:44:34 +01:00

InstCombineShifts.cpp

[InstCombine] Fix crash on large integers in visitShl (#176723)

2026-01-19 12:07:03 +01:00

InstCombineSimplifyDemanded.cpp

[InstCombine] Shrink added constant using LHS known zeros (#174380)

2026-02-07 20:41:58 +09:00

InstCombineVectorOps.cpp

[InstCombine] Limit canonicalization of extractelement(cast) to constant index or same basic block (#166227)

2026-01-08 22:43:13 +01:00

InstructionCombining.cpp

[NFC][LLVM] Remove pass initialization from pass constructors (#180158)

2026-02-06 09:06:32 -08:00