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cc65/libsrc/runtime/subysp.s
cuz 6d8cdae722 Runtime function improvements by Piotr Fusik
git-svn-id: svn://svn.cc65.org/cc65/trunk@2577 b7a2c559-68d2-44c3-8de9-860c34a00d81
2003-10-28 08:47:47 +00:00

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ArmAsm

;
; Piotr Fusik, 24.10.2003
; originally by Ullrich von Bassewitz
;
; CC65 runtime: Decrement the stackpointer by value in y
;
.export subysp
.importzp sp
.proc subysp
tya
eor #$ff
sec
adc sp
sta sp
bcs @L1
dec sp+1
@L1: rts
.endproc