tree 36b4e5aefcef9bfb5318507035f620ad0e549f09
parent 30faf968b1f348e944db3bde24c13462125007b1
author Matthew Dempsky <mdempsky@google.com> 1625284950 -0700
committer Matthew Dempsky <mdempsky@google.com> 1632269727 +0000

cmd/compile: use BMI1 instructions for GOAMD64=v3 and higher

BMI1 includes four instructions (ANDN, BLSI, BLSMSK, BLSR) that are
easy to peephole optimize, and which GCC always seems to favor using
when available and applicable.

Updates #45453.

Change-Id: I0274184057058f5c579e5bc3ea9c414396d3cf46
Reviewed-on: https://go-review.googlesource.com/c/go/+/351130
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>