[all-commits] [llvm/llvm-project] a1e396: [RISCV] Use switches for opcode checks in RISCVIns...

[Luke Lau via All-commits]

  Branch: refs/heads/users/lukel97/riscv/predicate-switch
  Home:   https://github.com/llvm/llvm-project
  Commit: a1e396f7df0b81299ca01759c98b1990d3bfc413
      https://github.com/llvm/llvm-project/commit/a1e396f7df0b81299ca01759c98b1990d3bfc413
  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

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



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications