A few minor 65C02 optimizations.

git-svn-id: svn://svn.cc65.org/cc65/trunk@3944 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/runtime/popsreg.s

@@ -1,5 +1,5 @@
 ;
-; Ullrich von Bassewitz, 21.08.1998
+; Ullrich von Bassewitz, 1998-08-21, 2009-02-22
 ;
 ; CC65 runtime: Pop TOS into sreg
 ;
@@ -8,15 +8,20 @@
 	.import		incsp2
        	.importzp	sp, sreg
 
+        .macpack        cpu
+
 popsreg:
    	pha	     		; save A
-   	ldy	#0
-   	lda	(sp),y		; get lo byte
-   	sta	sreg 		; store it
-   	iny
-   	lda	(sp),y		; get hi byte
+	ldy  	#1
+   	lda	(sp),y	   	; get hi byte
    	sta	sreg+1		; store it
+.if (.cpu .bitand ::CPU_ISET_65SC02)
+	lda	(sp)		; get lo byte
+.else
+   	dey
+   	lda	(sp),y		; get lo byte
+.endif
+   	sta	sreg 		; store it
    	pla	     		; get A back
    	jmp	incsp2		; bump stack and return
 
-