commit 888d44d3c16147019bb5a667b40bc68ecf4e7ba3
author Dave Cheney <dave@cheney.net> Thu Apr 09 21:25:48 2015 +1000
committer Dave Cheney <dave@cheney.net> Wed Apr 15 12:26:24 2015 +0000
tree bb1dd49cb61e6c87200239df3dd14cdde56839e1
parent 47515e01167268ca2b844e9b13cd47f7c2a613d8

cmd/internal/gc, cmd/7g: use zero register in Componentgen

Fixes #9855

Use an architectural zero register as the source for zeroing, if available.

Change-Id: Ie5b4ba4e3d356c6f892bfd1cebd14d5152bdeeb0
Reviewed-on: https://go-review.googlesource.com/8722
Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/7g/galign.go

diff --git a/src/cmd/7g/galign.go b/src/cmd/7g/galign.go
index c21cb67..3ad786a 100644
--- a/src/cmd/7g/galign.go
+++ b/src/cmd/7g/galign.go
@@ -49,6 +49,7 @@
 	gc.Thearch.REGRETURN = arm64.REG_R0
 	gc.Thearch.REGMIN = arm64.REG_R0
 	gc.Thearch.REGMAX = arm64.REG_R31
+	gc.Thearch.REGZERO = arm64.REGZERO
 	gc.Thearch.FREGMIN = arm64.REG_F0
 	gc.Thearch.FREGMAX = arm64.REG_F31
 	gc.Thearch.MAXWIDTH = MAXWIDTH