tree 48aab4dfa2c2ac17cad0f9763f556862c2b414d9
parent 3313bbb4055f38f53cd43c6c5782a229f445f230
author Keith Randall <khr@golang.org> 1702600190 -0800
committer Keith Randall <khr@google.com> 1702673461 +0000

cmd/asm: for arm, rewrite argument shifted right by 0 to left by 0.

Right shift by 0 has bad semantics. Make sure if we try to right shift by 0,
do a left shift by 0 instead.

CL 549955 handled full instructions with this strange no-op encoding.
This CL handles the shift done to instruction register inputs.
(The former is implemented using the latter, but not until deep
inside the assembler.)

Update #64715

Change-Id: Ibfabb4b13e2595551e58b977162fe005aaaa0ad1
Reviewed-on: https://go-review.googlesource.com/c/go/+/550335
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>