[all-commits] [llvm/llvm-project] b07880: [libc++] Replace modulus operations in std::seed_s...

[Laramie Leavitt via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b07880454ba32e48a2e7f7be35516e0b76f60077
      https://github.com/llvm/llvm-project/commit/b07880454ba32e48a2e7f7be35516e0b76f60077
  Author: Laramie Leavitt <laramie.leavitt at gmail.com>
  Date:   2022-05-24 (Tue, 24 May 2022)

  Changed paths:
    A libcxx/benchmarks/random.bench.cpp
    M libcxx/include/__random/seed_seq.h

  Log Message:
  -----------
  [libc++] Replace modulus operations in std::seed_seq::generate with conditional checks.

Abseil benchmarks suggest that the conditional checks result in faster code (4-5x)
as they are compiled into conditional move instructions (cmov on x86).

Reviewed By: #libc, philnik, Mordante

Spies: pengfei, Mordante, philnik, libcxx-commits

Differential Revision: https://reviews.llvm.org/D125329