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[InstCombine] Fold zext-add/sub-min/max-trunc to uadd.sat or usub.sat (#185259 )

Fixes #185244

```
trunc(umin(zext(a) + zext(b), MAX)) -> uadd.sat(a, b)
trunc(smin(zext(a) + zext(b), MAX)) -> uadd.sat(a, b)
trunc(smax(zext(a) - zext(b), 0)) --> usub.sat(a, b)
```

Proof: https://alive2.llvm.org/ce/z/K6wszu

2026-03-27 15:14:32 +01:00

CMakeLists.txt

…

InstCombineAddSub.cpp

[InstCombine] Support disjoint or in add-sub reassociation fold (#186827 )

2026-03-16 17:43:20 +00:00

InstCombineAndOrXor.cpp

Lowering ~x | (x - 1) to ~blsi(x) (#186722 )

2026-03-19 20:45:56 +08:00

InstCombineAtomicRMW.cpp

[Instcombine] Write Instcombine pass to strength reduce lock xadd to lock sub (#184715 )

2026-03-21 20:45:29 +00:00

InstCombineCalls.cpp

[InstCombine] Fix crash in foldReversedIntrinsicOperands for struct-return intrinsics (#186339 )

2026-03-13 10:28:21 +00:00

InstCombineCasts.cpp

[InstCombine] Fold zext-add/sub-min/max-trunc to uadd.sat or usub.sat (#185259 )

2026-03-27 15:14:32 +01:00

InstCombineCompares.cpp

[InstCombine] Fold fcmp (C - [su]itofp X), C to integer compares (#185826 )

2026-03-26 20:18:15 +01:00

InstCombineInternal.h

[Analysis][NFC] Drop use of BranchInst (#186374 )

2026-03-13 13:42:19 +00:00

InstCombineLoadStoreAlloca.cpp

[InstCombine] RAUW for proven zero-indexed GEPs rather than cloning for a specific user (#185053 )

2026-03-18 09:47:51 -05:00

InstCombineMulDivRem.cpp

InstCombine: Use SimplifyDemandedFPClass on fmul (#177490 )

2026-02-10 09:49:31 +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

[IPO][InstCombine][Vectorize][NFCI] Drop uses of BranchInst (#186596 )

2026-03-14 17:49:00 +00:00

InstCombineSelect.cpp

InstCombine: Fold out nanless canonicalize pattern (#172998 )

2026-03-25 15:09:19 +00:00

InstCombineShifts.cpp

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

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

InstCombineSimplifyDemanded.cpp

[InstCombine] Fix comment in SimplifyDemandedUseBits (NFC) (#187126 )

2026-03-18 18:45:56 +00:00

InstCombineVectorOps.cpp

[IPO][InstCombine][Vectorize][NFCI] Drop uses of BranchInst (#186596 )

2026-03-14 17:49:00 +00:00

InstructionCombining.cpp

[PatternMatch][NFC] Add m_IToFP and m_FPToI (#188040 )

2026-03-23 14:10:18 +00:00