[all-commits] [llvm/llvm-project] 017380: [AArch64][GlobalISel] Add pattern to prevent scala...

[Joshua Rodriguez via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 017380d800cc03dfc84f8e9c598b4ced6c052a8b
      https://github.com/llvm/llvm-project/commit/017380d800cc03dfc84f8e9c598b4ced6c052a8b
  Author: Joshua Rodriguez <josh.rodriguez at arm.com>
  Date:   2026-06-04 (Thu, 04 Jun 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
    M llvm/test/CodeGen/AArch64/arm64-arith-saturating.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Add pattern to prevent scalar uqxtn fallback (#201546)

Previously, attempting to select the intrinsic
@llvm.aarch64.neon.scalar.uqxtn would cause GlobalISel to fall back to
SDAG.
This was both due to:
1. RegBankSelect placing the operands on gpr banks.
2. No instruction selection patterns for the intrinsic.
Add pattern, and fix RegBankSelect to place operands on the correct
banks.



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