[all-commits] [llvm/llvm-project] 55b693: DAG: Skip poison elements in BUILD_VECTOR computeK...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/dag-knownbits-poison-elts
  Home:   https://github.com/llvm/llvm-project
  Commit: 55b693c5bb085e79aad12254c5cdea59e2487e8d
      https://github.com/llvm/llvm-project/commit/55b693c5bb085e79aad12254c5cdea59e2487e8d
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-07-31 (Fri, 31 Jul 2026)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.96bit.ll
    M llvm/test/CodeGen/AMDGPU/llvm.is.fpclass.bf16.ll
    M llvm/test/CodeGen/X86/avx512-trunc.ll
    M llvm/test/CodeGen/X86/build-vector-known-bits-poison.ll
    M llvm/test/CodeGen/X86/fpclamptosat_vec.ll
    M llvm/test/CodeGen/X86/ifma-combine-vpmadd52.ll
    M llvm/test/CodeGen/X86/kmov.ll
    M llvm/test/CodeGen/X86/pr120906.ll
    M llvm/test/CodeGen/X86/shrink_vmul.ll
    M llvm/test/CodeGen/X86/srem-vector-lkk.ll
    M llvm/test/CodeGen/X86/vector-mulfix-legalize.ll

  Log Message:
  -----------
  DAG: Skip poison elements in BUILD_VECTOR computeKnownBits

This defends against regressions in future patches. Copies the logic
from the IR version of computeKnownBits's handling of ConstantVector.
I'm not sure why the IR version doesn't directly return a value for poison,
but this follows suit.

Co-authored-by: Claude (Claude-Opus-4.8)



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