Optimize stpcpy's size and speed

2024-09-04 22:52:52 +02:00
parent 5e5dd1d6c4
commit 55d3a6ea39
4 changed files with 38 additions and 11 deletions
--- a/libsrc/common/strcpy.s
+++ b/libsrc/common/strcpy.s
@@ -25,6 +25,9 @@ L1:     lda     (ptr1),y
        inc     ptr2+1
        bne     L1

-L9:     lda     ptr2            ; X still contains high byte
-        rts
+L9:     lda     ptr2            ; X still contains dest's original high byte

+        ; On exit, we want AX to be dest (as this is what strcpy returns).
+        ; We also want (ptr2),y to still point to dest's terminator, as this
+        ; is used by stpcpy().
+        rts