_strlen.asm

很少见的源码公开的msc51和z80的c编译器。

;--------------------------------------------------------
; File Created by SDCC : FreeWare ANSI-C Compiler
; Version 2.3.0 Thu Sep 20 10:57:16 2001

;--------------------------------------------------------
	.module _strlen
	
;--------------------------------------------------------
; Public variables in this module
;--------------------------------------------------------
	.globl _strlen
;--------------------------------------------------------
; special function registers
;--------------------------------------------------------
;--------------------------------------------------------
; special function bits 
;--------------------------------------------------------
;--------------------------------------------------------
; internal ram data
;--------------------------------------------------------
	.area DSEG    (DATA)
;--------------------------------------------------------
; overlayable items in internal ram 
;--------------------------------------------------------
	.area _DUMMY
	.area	OSEG    (OVR,DATA)
;--------------------------------------------------------
; indirectly addressable internal ram data
;--------------------------------------------------------
	.area ISEG    (DATA)
;--------------------------------------------------------
; bit data
;--------------------------------------------------------
	.area BSEG    (BIT)
;--------------------------------------------------------
; external ram data
;--------------------------------------------------------
	.area XSEG    (XDATA)
;--------------------------------------------------------
; global & static initialisations
;--------------------------------------------------------
	.area GSINIT  (CODE)
	.area GSFINAL (CODE)
	.area GSINIT  (CODE)
;--------------------------------------------------------
; Home
;--------------------------------------------------------
	.area HOME	 (CODE)
	.area CSEG    (CODE)
;--------------------------------------------------------
; code
;--------------------------------------------------------
	.area CSEG    (CODE)
;------------------------------------------------------------
;Allocation info for local variables in function 'strlen'
;------------------------------------------------------------
;	_strlen.c 27
;	-----------------------------------------
;	 function strlen
;	-----------------------------------------
_strlen:
	ar2 = 0x02
	ar3 = 0x03
	ar4 = 0x04
	ar5 = 0x05
	ar6 = 0x06
	ar7 = 0x07
	ar0 = 0x00
	ar1 = 0x01
;	_strlen.c 34
	mov	r2,dpl
	mov	r3,dph
	mov	r4,b
;	_strlen.c 31
	mov	r5,#0x00
	mov	r6,#0x00
00101$:
	mov	dpl,r2
	mov	dph,r3
	mov	b,r4
	lcall	__gptrget
	mov	r7,a
	inc	dptr
	mov	r2,dpl
	mov	r3,dph
	mov	a,r7
; Peephole 110   removed ljmp by inverse jump logic
	jz  00103$
00108$:
;	_strlen.c 32
;	tail increment optimized
	inc	r5
	cjne	r5,#0x00,00101$
	inc	r6
; Peephole 132   changed ljmp to sjmp
	sjmp 00101$
00103$:
;	_strlen.c 34
	mov	dpl,r5
	mov	dph,r6
00104$:
	ret
	.area CSEG    (CODE)