[all-commits] [llvm/llvm-project] 1e42c7: [Mips] Fix cttz.i32 fails to lower on mips16 (#179...

[yingopq via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1e42c76d6133664b6b0a46e7844a27bb9ca6a45d
      https://github.com/llvm/llvm-project/commit/1e42c76d6133664b6b0a46e7844a27bb9ca6a45d
  Author: yingopq <115543042+yingopq at users.noreply.github.com>
  Date:   2026-02-11 (Wed, 11 Feb 2026)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/Mips/MipsISelLowering.cpp
    A llvm/test/CodeGen/Mips/GlobalISel/llvm-ir/cttz-mips16.ll

  Log Message:
  -----------
  [Mips] Fix cttz.i32 fails to lower on mips16 (#179633)

MIPS16 cannot handle constant pools created by CTTZ table lookup
expansion. This causes "Cannot select" errors when trying to select
MipsISD::Lo nodes for constant pool addresses.
    
Modify the table lookup conditions to check ConstantPool operation
status, and only set ConstantPool to Custom in non-MIPS16 mode in MIPS
backend.
    
This ensures MIPS16 uses the ISD::CTPOP instead of attempting
unsupported constant pool operations.

Fix #61055.



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