[all-commits] [llvm/llvm-project] 4536b1: [GlobalISel] Fix crash in isConstantOrConstantSpla...

[Mateusz Chudyk via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4536b1c44ebb54780f04e1ec992547d70a2d9700
      https://github.com/llvm/llvm-project/commit/4536b1c44ebb54780f04e1ec992547d70a2d9700
  Author: Mateusz Chudyk <mateusz.chudyk at intel.com>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/Utils.h
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/lib/CodeGen/GlobalISel/GISelValueTracking.cpp
    M llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
    M llvm/lib/CodeGen/GlobalISel/Utils.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerCombiner.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUCombinerHelper.cpp
    A llvm/test/CodeGen/AArch64/GlobalISel/combine-fdiv-inlineasm-operand.mir
    M llvm/unittests/CodeGen/GlobalISel/GISelUtilsTest.cpp

  Log Message:
  -----------
  [GlobalISel] Fix crash in isConstantOrConstantSplatVectorFP for non-register operands

isConstantOrConstantSplatVectorFP unconditionally accessed operand 0 as
a register, which causes a crash when the instruction is INLINEASM
(whose operand 0 is the asm string, not a register def).

This can happen when matchRepeatedFPDivisor walks the use-def chain of a
G_FDIV operand and reaches an INLINEASM instruction that defines the
dividend.



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