From: Tormod Volden <debian.tormod@gmail.com>
Date: Fri, 5 Jun 2015 12:07:23 +0000 (+0200)
Subject: dragon-nx32: Optimize uzero for large counts
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=85ed55f8c97df04dd8c45506ef9094b5784669b2;p=FUZIX.git

dragon-nx32: Optimize uzero for large counts

Signed-off-by: Tormod Volden <debian.tormod@gmail.com>
---

diff --git a/Kernel/platform-dragon-nx32/usermem_sam.s b/Kernel/platform-dragon-nx32/usermem_sam.s
index de4ff28d..b18089fd 100644
--- a/Kernel/platform-dragon-nx32/usermem_sam.s
+++ b/Kernel/platform-dragon-nx32/usermem_sam.s
@@ -124,14 +124,23 @@ uputl:
 
 __uzero:
 	pshs y,cc
-	lda #0
 	ldy 5,s
 	orcc #0x10
 	jsr map_process_always
-uzloop:
+	tfr y,d
+	clra
+	lsrb		; odd count?
+	bcc evenc
 	sta ,x+
 	leay -1,y
+	beq zdone
+evenc:
+	clrb
+uzloop:
+	std ,x++
+	leay -2,y
 	bne uzloop
+zdone:
 	jsr map_kernel
 	ldx #0
 	puls y,cc,pc