From d71d50b89ca6d2964238e3f309f5ee1b39e40757 Mon Sep 17 00:00:00 2001
From: Hidetoshi Shimokawa <simokawa@FreeBSD.org>
Date: Sat, 26 Jun 1999 15:22:33 +0000
Subject: [PATCH] Just return `curbrk' for sbrk(0) to avoid syscall overhead.

---
 lib/libc/alpha/sys/sbrk.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/libc/alpha/sys/sbrk.S b/lib/libc/alpha/sys/sbrk.S
index 3ecdd68f420e..5f4e15a22217 100644
--- a/lib/libc/alpha/sys/sbrk.S
+++ b/lib/libc/alpha/sys/sbrk.S
@@ -40,9 +40,11 @@ LEAF(sbrk, 1)
 	br	pv, L1				/* XXX profiling */
 L1:	LDGP(pv)
 	ldq	a1, curbrk
+	beq	a0, L2
 	addq	a0, a1, a0
 	CALLSYS_ERROR(break)
 	stq	a0, curbrk
+L2:
 	mov	a1, v0
 	RET
 END(sbrk)