commit 0f7de0481c140060c1c1133aeb5d2b708cb124d6
author Ben Shi <powerman1st@163.com> Fri Jun 23 10:00:07 2017 +0000
committer Cherry Zhang <cherryyz@google.com> Fri Jun 30 18:24:30 2017 +0000
tree 5af931b09f2ceef14795fe1b3c8a458fabda4b7a
parent 87a6340e8e91c1dbcc2472d666b69536e91ec163

arm/armasm: fix wrong decoding MOVW/MOVH/MOVB to plan9 syntax

There are two issues in decoding to arm plan9 syntax.

1. Though "0xe7912e29" is correctly decoded to "MOVW (R1)(R0>>28), R2",
"0xe7112e20" is also decoded to the same text, which is expected to
"MOVW.U (R1)(R0>>28), R2".

2. Both 0xe5d21000 and 0xe1d210d0 are decoded to "MOVB (R2), R1".
The first one is LDRB and should be decoded to "MOVBU (R2), R1". And
the second one is LDRSB and should be decoded to "MOVBS (R2), R1".

This patch fixes them and adds more decoding tests.

fix golang/go#20766

Change-Id: If3479c200fb250af1e1efb546576acb399eba7c1
Reviewed-on: https://go-review.googlesource.com/46493
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>