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/lsub.s
+++ b/libsrc/runtime/lsub.s
@@ -1,6 +1,6 @@
 ;
 ; Ullrich von Bassewitz, 05.08.1998
-;
+; Christian Krueger, 11-Mar-2017, ímproved  65SC02 optimization
 ; CC65 runtime: long sub
 ;

@@ -14,14 +14,19 @@
        .macpack        cpu

 tossub0ax:
+.if (.cpu .bitand ::CPU_ISET_65SC02)
+        stz     sreg
+        stz     sreg+1
+.else
        ldy     #$00
        sty     sreg
        sty     sreg+1
+.endif  

 tossubeax:
        sec
        eor     #$FF
-.if (.cpu .bitand CPU_ISET_65SC02)
+.if (.cpu .bitand ::CPU_ISET_65SC02)
        adc     (sp)            ; 65SC02 version - saves 2 cycles
        ldy     #1
 .else