From: Joel Sing <joel@sing.id.au>
Date: Sun, 28 Apr 2019 08:02:36 +0000 (+1000)
Subject: runtime: remove spurious register loads for openbsd/amd64 kqueue
X-Git-Tag: go1.13beta1~517
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=6b692300a136ab92bd16ccc6134a0f19f2cd63be;p=gostls13.git

runtime: remove spurious register loads for openbsd/amd64 kqueue

The kqueue system call takes no arguments, hence there should be no need
to zero the registers used for the first syscall arguments.

Change-Id: Ia79b2d4f4d568bb6795cb885e1464cf1fc2bf7c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/174128
Run-TryBot: Benny Siegert <bsiegert@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
---

diff --git a/src/runtime/sys_openbsd_amd64.s b/src/runtime/sys_openbsd_amd64.s
index 227e81869c..d5c030dd8d 100644
--- a/src/runtime/sys_openbsd_amd64.s
+++ b/src/runtime/sys_openbsd_amd64.s
@@ -348,9 +348,6 @@ TEXT runtime·sysctl(SB),NOSPLIT,$0
 
 // int32 runtime·kqueue(void);
 TEXT runtime·kqueue(SB),NOSPLIT,$0
-	MOVQ	$0, DI
-	MOVQ	$0, SI
-	MOVQ	$0, DX
 	MOVL	$269, AX
 	SYSCALL
 	JCC	2(PC)