[all-commits] [llvm/llvm-project] a8af62: [RISCV] Use switches for opcode checks in RISCVIns...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a8af62d00b82c9226cca3b4abdf376158f6bde53
      https://github.com/llvm/llvm-project/commit/a8af62d00b82c9226cca3b4abdf376158f6bde53
  Author: Luke Lau <luke at igalia.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrPredicates.td

  Log Message:
  -----------
  [RISCV] Use switches for opcode checks in RISCVInstrPredicates.td. NFC (#225695)

CheckOpcode expands out to a linear search which is slow when there's
lots of opcodes in the list. Using a switch statement allows a jump
table to be emitted which improves compile time, since these predicates
are hammered quite frequently.

Measured to reduce geomean -1.15% instructions retired on CTMark w/ a
stage2 rva23u64 -O3 Clang build.

Assisted-By: Opus 5.5



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