tree b66a3bd02c7e8266b3ddf53a4ea7731e91f3d982
parent 6643c252bf235fe87ac4c79b621f19ef14faa8a2
author Cherry Zhang <cherryyz@google.com> 1496233825 -0400
committer Russ Cox <rsc@golang.org> 1508517281 -0400

[release-branch.go1.8] cmd/compile: fix subword store/load elision for MIPS

Apply the fix in CL 44355 to MIPS.

ARM64 has these rules but commented out for performance reason.
Fix the commented rules, in case they are enabled in the future.

Enhance the test so it triggers the failure on ARM and MIPS without
the fix.

Updates #20530.

Change-Id: I82d77448e3939a545fe519d0a29a164f8fa5417c
Reviewed-on: https://go-review.googlesource.com/44430
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>