Adapted div & mod for popptr1.

2018-05-24 03:55:40 +02:00
parent 746e3d1454
commit dd411efd1c
9 changed files with 92 additions and 122 deletions
--- a/libsrc/runtime/negabs.s
+++ b/libsrc/runtime/negabs.s
@@ -0,0 +1,26 @@
+;
+; Ullrich von Bassewitz, 05.08.1998
+;
+; int abs (int x);
+; and
+; CC65 runtime: negation on ints
+;
+
+        .export         negax
+        .export         _abs
+
+_abs:   cpx     #$00            ; test hi byte
+        bpl     L1              ; don't touch if positive
+negax:  clc
+        eor     #$FF
+        adc     #1
+        pha
+        txa
+        eor     #$FF
+        adc     #0
+        tax
+        pla
+ L1:    rts
+
+
+