tree b9e1f10f66999a3e4ab9289dd07f7c7da295c2d8
parent f1562c761014111ce359b14016718ddabd24c2f2
author Keith Randall <khr@golang.org> 1613174125 -0800
committer Keith Randall <khr@golang.org> 1614103368 +0000

cmd/compile: improve bit test code

Some bit test instruction generation stopped triggering after
the change to addressing modes. I suspect this was just because
ANDQload was being generated before the rewrite rules could discover
the BTQ. Fix that by decomposing the ANDQload when it is surrounded
by a TESTQ (thus re-enabling the BTQ rules).

Fixes #44228

Change-Id: I489b4a5a7eb01c65fc8db0753f8cec54097cadb2
Reviewed-on: https://go-review.googlesource.com/c/go/+/291749
Trust: Keith Randall <khr@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>