few 6502 and some 65SC02 optimizations

2017-03-12 23:21:43 +01:00
parent 0ec4534bd6
commit 0de44517ac
23 changed files with 272 additions and 78 deletions
--- a/libsrc/runtime/lpush.s
+++ b/libsrc/runtime/lpush.s
@@ -1,5 +1,6 @@
 ;
 ; Ullrich von Bassewitz, 06.08.1998
+; Christian Krueger, 11-Mar-2017, added 65SC02 optimization
 ;
 ; CC65 runtime: long push
 ;
@@ -11,13 +12,20 @@
        .import         decsp4
        .importzp       sp, sreg

+        .macpack        cpu
+
 pushl0:
        lda     #0
        tax
 push0ax:
-        ldy     #0
+.if (.cpu .bitand ::CPU_ISET_65SC02)
+        stz     sreg
+        stz     sreg+1
+.else
+        ldy     #$00
        sty     sreg
        sty     sreg+1
+.endif
 pusheax:
        pha                     ; decsp will destroy A (but not X)
        jsr     decsp4
@@ -30,8 +38,12 @@ pusheax:
        dey
        txa
        sta     (sp),y
-        dey
        pla
+.if (.cpu .bitand ::CPU_ISET_65SC02)
+        sta     (sp)
+.else        
+        dey
        sta     (sp),y
+.endif        
        rts