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#include "setarch.h"
 
#include "defines.h"
 
#if defined (__H8300SX__)
 
        .global _memset
_memset:
        ; Use er3 is a temporary since er0 must remain unchanged on exit.
        mov.l   er0,er3
 
        ; Fill er1 with the byte to copy.
        mov.b   r1l,r1h
        mov.w   r1,e1
 
        ; Account for any excess bytes and words that will be copied after
        ; the main loop.  r2 >= 0 if there is a longword to copy.
        sub     #4,LEN(r2)
        blo     longs_done
 
        ; Copy one byte if doing so will make er3 word-aligned.
        ; This isn't needed for correctness but it makes the main loop
        ; slightly faster.
        bld     #0,r3l
        bcc     word_aligned
        mov.b   r1l,@er3+
        sub     #1,LEN(r2)
        blo     longs_done
 
word_aligned:
        ; Likewise one word for longword alignment.
        bld     #1,r3l
        bcc     long_copy
        mov.w   r1,@er3+
        sub     #2,LEN(r2)
        blo     longs_done
 
long_copy:
        ; Copy longwords.
        mov.l   er1,@er3+
        sub     #4,LEN(r2)
        bhs     long_copy
 
longs_done:
        ; At this point, we need to copy r2 & 3 bytes.  Copy a word
        ; if necessary.
        bld     #1,r2l
        bcc     words_done
        mov.w   r1,@er3+
 
words_done:
        ; Copy a byte.
        bld     #0,r2l
        bcc     bytes_done
        mov.b   r1l,@er3+
 
bytes_done:
        rts
 
#else
 
; A0P pointer to cursor
; A1P thing to copy
        .global _memset
 
_memset:
 
;       MOVP    @(2/4,r7),A2P   ; dst
;       MOVP    @(4/8,r7),A1    ; src thing
;       MOVP    @(6/12,r7),A3P  ; len
 
        MOVP    A2P,A2P
        beq     quit
 
        ; A3 points to the end of the area
        MOVP    A0P,A3P
        ADDP    A2P,A3P
 
        ; see if we can do it in words
        ; by oring in the start of the buffer to the end address
 
        or      A0L,A2L
        btst    #0,A2L
        bne     byteloop
 
        ; we can do it a word at a time
 
        mov.b   A1L,A1H
 
wordloop:
        mov.w   A1,@-A3P
        CMPP    A3P,A0P
        bne     wordloop
quit:   rts
 
byteloop:
        mov.b   A1L,@-A3P
        CMPP    A3P,A0P
        bne     byteloop
        rts
 
#endif

Line No.	Rev	Author	Line
1	207	jeremybenn	`#include "setarch.h"`
2
3			`#include "defines.h"`
4
5			`#if defined (__H8300SX__)`
6
7			`.global _memset`
8			`_memset:`
9			`; Use er3 is a temporary since er0 must remain unchanged on exit.`
10			`mov.l er0,er3`
11
12			`; Fill er1 with the byte to copy.`
13			`mov.b r1l,r1h`
14			`mov.w r1,e1`
15
16			`; Account for any excess bytes and words that will be copied after`
17			`; the main loop. r2 >= 0 if there is a longword to copy.`
18			`sub #4,LEN(r2)`
19			`blo longs_done`
20
21			`; Copy one byte if doing so will make er3 word-aligned.`
22			`; This isn't needed for correctness but it makes the main loop`
23			`; slightly faster.`
24			`bld #0,r3l`
25			`bcc word_aligned`
26			`mov.b r1l,@er3+`
27			`sub #1,LEN(r2)`
28			`blo longs_done`
29
30			`word_aligned:`
31			`; Likewise one word for longword alignment.`
32			`bld #1,r3l`
33			`bcc long_copy`
34			`mov.w r1,@er3+`
35			`sub #2,LEN(r2)`
36			`blo longs_done`
37
38			`long_copy:`
39			`; Copy longwords.`
40			`mov.l er1,@er3+`
41			`sub #4,LEN(r2)`
42			`bhs long_copy`
43
44			`longs_done:`
45			`; At this point, we need to copy r2 & 3 bytes. Copy a word`
46			`; if necessary.`
47			`bld #1,r2l`
48			`bcc words_done`
49			`mov.w r1,@er3+`
50
51			`words_done:`
52			`; Copy a byte.`
53			`bld #0,r2l`
54			`bcc bytes_done`
55			`mov.b r1l,@er3+`
56
57			`bytes_done:`
58			`rts`
59
60			`#else`
61
62			`; A0P pointer to cursor`
63			`; A1P thing to copy`
64			`.global _memset`
65
66			`_memset:`
67
68			`; MOVP @(2/4,r7),A2P ; dst`
69			`; MOVP @(4/8,r7),A1 ; src thing`
70			`; MOVP @(6/12,r7),A3P ; len`
71
72			`MOVP A2P,A2P`
73			`beq quit`
74
75			`; A3 points to the end of the area`
76			`MOVP A0P,A3P`
77			`ADDP A2P,A3P`
78
79			`; see if we can do it in words`
80			`; by oring in the start of the buffer to the end address`
81
82			`or A0L,A2L`
83			`btst #0,A2L`
84			`bne byteloop`
85
86			`; we can do it a word at a time`
87
88			`mov.b A1L,A1H`
89
90			`wordloop:`
91			`mov.w A1,@-A3P`
92			`CMPP A3P,A0P`
93			`bne wordloop`
94			`quit: rts`
95
96			`byteloop:`
97			`mov.b A1L,@-A3P`
98			`CMPP A3P,A0P`
99			`bne byteloop`
100			`rts`
101
102			`#endif`

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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [h8300/] [memset.S] - Blame information for rev 842