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/lrsub.s
+++ b/libsrc/runtime/lrsub.s
@@ -1,5 +1,6 @@
 ;
 ; Ullrich von Bassewitz, 05.08.1998
+; Christian Krueger, 11-Mar-2017, added 65SC02 optimization
 ;
 ; CC65 runtime: long sub reversed
 ;
@@ -11,18 +12,30 @@
        .import         addysp1
        .importzp       sp, sreg, tmp1

+        .macpack        cpu
+
 tosrsub0ax:
+.if (.cpu .bitand ::CPU_ISET_65SC02)
+        stz     sreg
+        stz     sreg+1
+.else
        ldy     #$00
        sty     sreg
        sty     sreg+1
+.endif

-tosrsubeax:                         
-        ldy     #0
+tosrsubeax:
        sec
+.if (.cpu .bitand ::CPU_ISET_65SC02)
+        sbc     (sp)
+        ldy     #1
+.else                         
+        ldy     #0
        sbc     (sp),y          ; byte 0
+        iny
+.endif
        sta     tmp1            ; use as temp storage
        txa
-        iny
        sbc     (sp),y          ; byte 1
        tax
        iny