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 227e81869c0f67417bc2320a45fc91941defbf4b..d5c030dd8d07579d7371e784f1b5abb68b3361a0 100644 (file)
--- 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)