_strncmp.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 10:57:28 2001

;--------------------------------------------------------
	.module _strncmp
	
;--------------------------------------------------------
; Public variables in this module
;--------------------------------------------------------
	.globl _strncmp_PARM_3
	.globl _strncmp_PARM_2
	.globl _strncmp
;--------------------------------------------------------
; special function registers
;--------------------------------------------------------
;--------------------------------------------------------
; special function bits 
;--------------------------------------------------------
;--------------------------------------------------------
; internal ram data
;--------------------------------------------------------
	.area DSEG    (DATA)
;--------------------------------------------------------
; overlayable items in internal ram 
;--------------------------------------------------------
	.area OSEG    (OVR,DATA)
;--------------------------------------------------------
; indirectly addressable internal ram data
;--------------------------------------------------------
	.area ISEG    (DATA)
;--------------------------------------------------------
; bit data
;--------------------------------------------------------
	.area BSEG    (BIT)
;--------------------------------------------------------
; external ram data
;--------------------------------------------------------
	.area XSEG    (XDATA)
_strncmp_PARM_2::
	.ds 3
_strncmp_PARM_3::
	.ds 2
_strncmp_first_1_1::
	.ds 3
;--------------------------------------------------------
; 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 'strncmp'
;------------------------------------------------------------
;last                      Allocated to in memory with name '_strncmp_PARM_2'
;count                     Allocated to in memory with name '_strncmp_PARM_3'
;first                     Allocated to in memory with name '_strncmp_first_1_1'
;	_strncmp.c 27
;	-----------------------------------------
;	 function strncmp
;	-----------------------------------------
_strncmp:
	ar2 = 0x02
	ar3 = 0x03
	ar4 = 0x04
	ar5 = 0x05
	ar6 = 0x06
	ar7 = 0x07
	ar0 = 0x00
	ar1 = 0x01
;	_strncmp.c 0
	push	b
	push	dph
	push	dpl
	mov	dptr,#_strncmp_first_1_1
	pop	acc
	movx	@dptr,a
	pop	acc
	inc	dptr
	movx	@dptr,a
	pop	acc
	inc	dptr
	movx	@dptr,a
;	_strncmp.c 33
	mov	dptr,#_strncmp_PARM_3
	movx	a,@dptr
	mov	r2,a
	inc	dptr
	movx	a,@dptr
; Peephole 135   removed redundant mov
	mov  r3,a
	orl  a,r2
; Peephole 109   removed ljmp by inverse jump logic
	jnz  00114$
00115$:
;	_strncmp.c 34
; Peephole 181   used 16 bit load of dptr
	mov  dptr,#0x0000
	ljmp	00108$
;	_strncmp.c 36
00114$:
	mov	dptr,#_strncmp_first_1_1
	movx	a,@dptr
	mov	r2,a
	inc	dptr
	movx	a,@dptr
	mov	r3,a
	inc	dptr
	movx	a,@dptr
	mov	r4,a
	mov	dptr,#_strncmp_PARM_2
	movx	a,@dptr
	mov	r5,a
	inc	dptr
	movx	a,@dptr
	mov	r6,a
	inc	dptr
	movx	a,@dptr
	mov	r7,a
00105$:
	mov	dptr,#_strncmp_PARM_3
	movx	a,@dptr
	add	a,#0xff
	mov	r0,a
	inc	dptr
	movx	a,@dptr
	addc	a,#0xff
	mov	r1,a
	mov	dptr,#_strncmp_PARM_3
	mov	a,r0
	movx	@dptr,a
	inc	dptr
	mov	a,r1
	movx	@dptr,a
	mov	a,r0
	orl	a,r1
; Peephole 110   removed ljmp by inverse jump logic
	jz  00107$
00116$:
	mov	dpl,r2
	mov	dph,r3
	mov	b,r4
	lcall	__gptrget
	mov	r0,a
	inc	dptr
	mov	r2,dpl
	mov	r3,dph
	mov	a,r0
; Peephole 110   removed ljmp by inverse jump logic
	jz  00107$
00117$:
	mov	dpl,r5
	mov	dph,r6
	mov	b,r7
	lcall	__gptrget
	mov	r1,a
	inc	dptr
	mov	r5,dpl
	mov	r6,dph
	mov	a,r0
; Peephole 132   changed ljmp to sjmp
; Peephole 199   optimized misc jump sequence
	cjne a,ar1,00107$
;00118$:
; Peephole 200   removed redundant sjmp
00119$:
;	_strncmp.c 37
	mov	dptr,#_strncmp_first_1_1
	mov	a,r2
	movx	@dptr,a
	inc	dptr
	mov	a,r3
	movx	@dptr,a
	inc	dptr
	mov	a,r4
	movx	@dptr,a
;	_strncmp.c 38
	ljmp	00105$
00107$:
;	_strncmp.c 41
	mov	dptr,#_strncmp_first_1_1
	mov	a,r2
	movx	@dptr,a
	inc	dptr
	mov	a,r3
	movx	@dptr,a
	inc	dptr
	mov	a,r4
	movx	@dptr,a
	mov	dpl,r2
	mov	dph,r3
	mov	b,r4
	lcall	__gptrget
	mov	r2,a
	mov	dpl,r5
	mov	dph,r6
	mov	b,r7
	lcall	__gptrget
	mov	r5,a
	clr	c
	mov	a,r2
	subb	a,r5
	mov	r2,a
; Peephole 180   changed mov to clr
	clr  a
	subb	a,#0x00
	mov	r3,a
	mov	dpl,r2
	mov	dph,r3
00108$:
	ret
	.area CSEG    (CODE)