[all-commits] [llvm/llvm-project] 70905e: [RFC][IR] Remove `Constant::isZeroValue` (#181521)

[Shilei Tian via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 70905e0afae2e2f14c405bca514494c5b1449822
      https://github.com/llvm/llvm-project/commit/70905e0afae2e2f14c405bca514494c5b1449822
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2026-02-15 (Sun, 15 Feb 2026)

  Changed paths:
    M clang/lib/CodeGen/CGDecl.cpp
    M clang/lib/CodeGen/ItaniumCXXABI.cpp
    M llvm/docs/ReleaseNotes.md
    M llvm/include/llvm/IR/Constant.h
    M llvm/lib/Analysis/BranchProbabilityInfo.cpp
    M llvm/lib/Analysis/ConstantFolding.cpp
    M llvm/lib/Analysis/Lint.cpp
    M llvm/lib/Analysis/Local.cpp
    M llvm/lib/Analysis/MustExecute.cpp
    M llvm/lib/Analysis/ScalarEvolution.cpp
    M llvm/lib/Analysis/ValueTracking.cpp
    M llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp
    M llvm/lib/CodeGen/InterleavedAccessPass.cpp
    M llvm/lib/FuzzMutate/IRMutator.cpp
    M llvm/lib/IR/AutoUpgrade.cpp
    M llvm/lib/IR/Constants.cpp
    M llvm/lib/IR/DebugInfo.cpp
    M llvm/lib/Target/AArch64/AArch64PromoteConstant.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
    M llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp
    M llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
    M llvm/lib/Target/Hexagon/HexagonVectorCombine.cpp
    M llvm/lib/Target/X86/X86LowerAMXType.cpp
    M llvm/lib/Transforms/IPO/AttributorAttributes.cpp
    M llvm/lib/Transforms/IPO/FunctionSpecialization.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
    M llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
    M llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
    M llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
    M llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
    M llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
    M llvm/unittests/Analysis/ValueLatticeTest.cpp
    M mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
    M polly/lib/Support/SCEVValidator.cpp
    M polly/lib/Transform/ZoneAlgo.cpp

  Log Message:
  -----------
  [RFC][IR] Remove `Constant::isZeroValue` (#181521)

`Constant::isZeroValue` currently behaves same as
`Constant::isNullValue` for all types except floating-point, where it
additionally returns true for negative zero (`-0.0`). However, in
practice, almost all callers operate on integer/pointer types where the
two are equivalent, and the few FP-relevant callers have no meaningful
dependence on the `-0.0` behavior.

This PR removes `isZeroValue` to eliminate the confusing API. All
callers are changed to `isNullValue` with no test failures.

`isZeroValue` will be reintroduced in a future change with clearer
semantics: when null pointers may have non-zero bit patterns,
`isZeroValue` will check for bitwise-all-zeros, while `isNullValue` will
check for the semantic null (which
may be non-zero).



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