URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [machine/] [sh/] [memcpy.S] - Blame information for rev 855

Go to most recent revision | Details | Compare with Previous | View Log


!
! Fast SH memcpy
!
! by Toshiyasu Morita (tm@netcom.com)
! hacked by J"orn Rernnecke (joern.rennecke@superh.com) ("o for o-umlaut)
! SH5 code Copyright 2002 SuperH Ltd.
!
! Entry: ARG0: destination pointer
!        ARG1: source pointer
!        ARG3: byte count
!
! Exit:  RESULT: destination pointer
!        any other registers in the range r0-r7: trashed
!
! Notes: Usually one wants to do small reads and write a longword, but
!        unfortunately it is difficult in some cases to concatanate bytes
!        into a longword on the SH, so this does a longword read and small
!        writes.
!
! This implementation makes two assumptions about how it is called:
!
! 1.: If the byte count is nonzero, the address of the last byte to be
!     copied is unsigned greater than the address of the first byte to
!     be copied.  This could be easily swapped for a signed comparison,
!     but the algorithm used needs some comparison.
!
! 2.: When there are two or three bytes in the last word of an 11-or-more
!     bytes memory chunk to b copied, the rest of the word can be read
!     without side effects.
!     This could be easily changed by increasing the minumum size of
!     a fast memcpy and the amount subtracted from r7 before L_2l_loop be 2,
!     however, this would cost a few extra cyles on average.
!     For SHmedia, the assumption is that any quadword can be read in its
!     enirety if at least one byte is included in the copy.
!
 
#include "asm.h"
 
ENTRY(memcpy)
 
#if __SHMEDIA__
 
#define LDUAQ(P,O,D0,D1) ldlo.q P,O,D0; ldhi.q P,O+7,D1
#define STUAQ(P,O,D0,D1) stlo.q P,O,D0; sthi.q P,O+7,D1
#define LDUAL(P,O,D0,D1) ldlo.l P,O,D0; ldhi.l P,O+3,D1
#define STUAL(P,O,D0,D1) stlo.l P,O,D0; sthi.l P,O+3,D1
 
        ld.b r3,0,r63
        pta/l Large,tr0
        movi 25,r0
        bgeu/u r4,r0,tr0
        nsb r4,r0
        shlli r0,5,r0
        movi (L1-L0+63*32 + 1) & 0xffff,r1
        sub r1, r0, r0
L0:     ptrel r0,tr0
        add r2,r4,r5
        ptabs r18,tr1
        add r3,r4,r6
        blink tr0,r63
 
        .balign 8
L1:
        /* 0 byte memcpy */
        blink tr1,r63
 
L4_7:   /* 4..7 byte memcpy cntd. */
        stlo.l r2, 0, r0
        or r6, r7, r6
        sthi.l r5, -1, r6
        stlo.l r5, -4, r6
        blink tr1,r63
 
L2_3:   /* 2 or 3 byte memcpy cntd. */
        st.b r5,-1,r6
        blink tr1,r63
 
        /* 1 byte memcpy */
        ld.b r3,0,r0
        st.b r2,0,r0
        blink tr1,r63
 
L8_15:  /* 8..15 byte memcpy cntd. */
        stlo.q r2, 0, r0
        or r6, r7, r6
        sthi.q r5, -1, r6
        stlo.q r5, -8, r6
        blink tr1,r63
 
        /* 2 or 3 byte memcpy */
        ld.b r3,0,r0
        ld.b r2,0,r63
        ld.b r3,1,r1
        st.b r2,0,r0
        pta/l L2_3,tr0
        ld.b r6,-1,r6
        st.b r2,1,r1
        blink tr0, r63
 
        /* 4 .. 7 byte memcpy */
        LDUAL (r3, 0, r0, r1)
        pta L4_7, tr0
        ldlo.l r6, -4, r7
        or r0, r1, r0
        sthi.l r2, 3, r0
        ldhi.l r6, -1, r6
        blink tr0, r63
 
        /* 8 .. 15 byte memcpy */
        LDUAQ (r3, 0, r0, r1)
        pta L8_15, tr0
        ldlo.q r6, -8, r7
        or r0, r1, r0
        sthi.q r2, 7, r0
        ldhi.q r6, -1, r6
        blink tr0, r63
 
        /* 16 .. 24 byte memcpy */
        LDUAQ (r3, 0, r0, r1)
        LDUAQ (r3, 8, r8, r9)
        or r0, r1, r0
        sthi.q r2, 7, r0
        or r8, r9, r8
        sthi.q r2, 15, r8
        ldlo.q r6, -8, r7
        ldhi.q r6, -1, r6
        stlo.q r2, 8, r8
        stlo.q r2, 0, r0
        or r6, r7, r6
        sthi.q r5, -1, r6
        stlo.q r5, -8, r6
        blink tr1,r63
 
Large:
        ld.b r2, 0, r63
        pta/l  Loop_ua, tr1
        ori r3, -8, r7
        sub r2, r7, r22
        sub r3, r2, r6
        add r2, r4, r5
        ldlo.q r3, 0, r0
        addi r5, -16, r5
        movi 64+8, r27 // could subtract r7 from that.
        stlo.q r2, 0, r0
        sthi.q r2, 7, r0
        ldx.q r22, r6, r0
        bgtu/l r27, r4, tr1
 
        addi r5, -48, r27
        pta/l Loop_line, tr0
        addi r6, 64, r36
        addi r6, -24, r19
        addi r6, -16, r20
        addi r6, -8, r21
 
Loop_line:
        ldx.q r22, r36, r63
        alloco r22, 32
        addi r22, 32, r22
        ldx.q r22, r19, r23
        sthi.q r22, -25, r0
        ldx.q r22, r20, r24
        ldx.q r22, r21, r25
        stlo.q r22, -32, r0
        ldx.q r22, r6,  r0
        sthi.q r22, -17, r23
        sthi.q r22,  -9, r24
        sthi.q r22,  -1, r25
        stlo.q r22, -24, r23
        stlo.q r22, -16, r24
        stlo.q r22,  -8, r25
        bgeu r27, r22, tr0
 
Loop_ua:
        addi r22, 8, r22
        sthi.q r22, -1, r0
        stlo.q r22, -8, r0
        ldx.q r22, r6, r0
        bgtu/l r5, r22, tr1
 
        add r3, r4, r7
        ldlo.q r7, -8, r1
        sthi.q r22, 7, r0
        ldhi.q r7, -1, r7
        ptabs r18,tr1
        stlo.q r22, 0, r0
        or r1, r7, r1
        sthi.q r5, 15, r1
        stlo.q r5, 8, r1
        blink tr1, r63
 
#else /* ! SHMEDIA, i.e. SH1 .. SH4 / SHcompact */
 
#ifdef __SH5__
#define DST r2
#define SRC r3
#define COUNT r4
#define TMP0 r5
#define TMP1 r6
#define RESULT r2
#else
#define DST r4
#define SRC r5
#define COUNT r6
#define TMP0 r2
#define TMP1 r3
#define RESULT r0
#endif
 
#ifdef __LITTLE_ENDIAN__
        ! Little endian version copies with increasing addresses.
        mov DST,TMP1    ! Save return value
        mov #11,r0      ! Check if small number of bytes
        cmp/hs r0,COUNT
                        ! COUNT becomes src end address
        SL(bf, L_small, add SRC,COUNT)
        mov #1,r1
        tst r1,SRC      ! check if source even
        SL(bt, L_even, mov COUNT,r7)
        mov.b @SRC+,r0  ! no, make it even.
        mov.b r0,@DST
        add #1,DST
L_even: tst r1,DST      ! check if destination is even
        add #-3,r7
        SL(bf, L_odddst, mov #2,r1)
        tst r1,DST      ! check if destination is 4-byte aligned
        mov DST,r0
        SL(bt, L_al4dst, sub SRC,r0)
        mov.w @SRC+,TMP0
        mov.w TMP0,@DST
        ! add #2,DST  DST is dead here.
L_al4dst:
        tst r1,SRC
        bt L_al4both
        mov.w @SRC+,r1
        swap.w r1,r1
        add #-6,r0
        add #-6,r7      ! r7 := src end address minus 9.
        .align 2
L_2l_loop:
        mov.l @SRC+,TMP0 ! Read & write two longwords per iteration
        xtrct TMP0,r1
        mov.l r1,@(r0,SRC)
        cmp/hs r7,SRC
        mov.l @SRC+,r1
        xtrct r1,TMP0
        mov.l TMP0,@(r0,SRC)
        bf L_2l_loop
        add #-2,SRC
        bra  L_cleanup
        add #5,r0
L_al4both:
        add #-4,r0
        .align 2
L_al4both_loop:
        mov.l @SRC+,DST   ! Read longword, write longword per iteration
        cmp/hs r7,SRC
        SL(bf, L_al4both_loop, mov.l DST,@(r0,SRC))
 
        bra L_cleanup
        add #3,r0
 
L_odddst:
        tst r1,SRC
        SL(bt, L_al4src, add #-1,DST)
        mov.w @SRC+,r0
        mov.b r0,@(1,DST)
        shlr8 r0
        mov.b r0,@(2,DST)
        add #2,DST
L_al4src:
        .align 2
L_odd_loop:
        mov.l @SRC+,r0   ! Read longword, write byte, word, byte per iteration
        cmp/hs r7,SRC
        mov.b r0,@(1,DST)
        shlr8 r0
        mov.w r0,@(2,DST)
        shlr16 r0
        mov.b r0,@(4,DST)
        SL(bf, L_odd_loop, add #4,DST)
        .align 2 ! avoid nop in more frequently executed code.
L_cleanup2:
        mov     DST,r0
        sub     SRC,r0
L_cleanup:
        cmp/eq  COUNT,SRC
        bt      L_ready
        .align 2
L_cleanup_loop:
        mov.b   @SRC+,r1
        cmp/eq  COUNT,SRC
        mov.b   r1,@(r0,SRC)
        bf      L_cleanup_loop
L_ready:
        rts
        mov     TMP1,RESULT
L_small:
        bra L_cleanup2
        add #-1,DST
#else /* ! __LITTLE_ENDIAN__ */
        ! Big endian version copies with decreasing addresses.
        mov DST,r0
        add COUNT,r0
        sub DST,SRC
        mov #11,r1
        cmp/hs r1,COUNT
        SL(bf, L_small, add #-1,SRC)
        mov SRC,TMP1
        add r0,TMP1
        shlr TMP1
        SL(bt, L_even,
        mov DST,r7)
        mov.b @(r0,SRC),TMP0
        add #-1,TMP1
        mov.b TMP0,@-r0
L_even:
        tst #1,r0
        add #-1,SRC
        SL(bf, L_odddst, add #8,r7)
        tst #2,r0
        bt L_al4dst
        add #-1,TMP1
        mov.w @(r0,SRC),r1
        mov.w r1,@-r0
L_al4dst:
        shlr TMP1
        bt L_al4both
        mov.w @(r0,SRC),r1
        swap.w r1,r1
        add #4,r7
        add #-4,SRC
        .align 2
L_2l_loop:
        mov.l @(r0,SRC),TMP0
        xtrct TMP0,r1
        mov.l r1,@-r0
        cmp/hs r7,r0
        mov.l @(r0,SRC),r1
        xtrct r1,TMP0
        mov.l TMP0,@-r0
        bt L_2l_loop
        bra L_cleanup
        add #5,SRC
 
        nop ! avoid nop in executed code.
L_al4both:
        add #-2,SRC
        .align 2
L_al4both_loop:
        mov.l @(r0,SRC),r1
        cmp/hs r7,r0
        SL(bt, L_al4both_loop,
        mov.l r1,@-r0)
        bra L_cleanup
        add #3,SRC
 
        nop ! avoid nop in executed code.
L_odddst:
        shlr TMP1
        bt L_al4src
        mov.w @(r0,SRC),r1
        mov.b r1,@-r0
        shlr8 r1
        mov.b r1,@-r0
L_al4src:
        add #-2,SRC
        .align 2
L_odd_loop:
        mov.l @(r0,SRC),TMP0
        cmp/hs r7,r0
        mov.b TMP0,@-r0
        shlr8 TMP0
        mov.w TMP0,@-r0
        shlr16 TMP0
        mov.b TMP0,@-r0
        bt L_odd_loop
 
        add #3,SRC
L_cleanup:
L_small:
        cmp/eq DST,r0
        bt L_ready
        add #1,DST
        .align 2
L_cleanup_loop:
        mov.b @(r0,SRC),TMP0
        cmp/eq DST,r0
        mov.b TMP0,@-r0
        bf L_cleanup_loop
L_ready:
        rts
        mov r0,RESULT
#endif /* ! __LITTLE_ENDIAN__ */
#endif /* ! SHMEDIA */

Browse

Tools

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [machine/] [sh/] [memcpy.S] - Blame information for rev 855

Line No.	Rev	Author	Line
1	148	jeremybenn	`!`
2			`! Fast SH memcpy`
3			`!`
4			`! by Toshiyasu Morita (tm@netcom.com)`
5			`! hacked by J"orn Rernnecke (joern.rennecke@superh.com) ("o for o-umlaut)`
6			`! SH5 code Copyright 2002 SuperH Ltd.`
7			`!`
8			`! Entry: ARG0: destination pointer`
9			`! ARG1: source pointer`
10			`! ARG3: byte count`
11			`!`
12			`! Exit: RESULT: destination pointer`
13			`! any other registers in the range r0-r7: trashed`
14			`!`
15			`! Notes: Usually one wants to do small reads and write a longword, but`
16			`! unfortunately it is difficult in some cases to concatanate bytes`
17			`! into a longword on the SH, so this does a longword read and small`
18			`! writes.`
19			`!`
20			`! This implementation makes two assumptions about how it is called:`
21			`!`
22			`! 1.: If the byte count is nonzero, the address of the last byte to be`
23			`! copied is unsigned greater than the address of the first byte to`
24			`! be copied. This could be easily swapped for a signed comparison,`
25			`! but the algorithm used needs some comparison.`
26			`!`
27			`! 2.: When there are two or three bytes in the last word of an 11-or-more`
28			`! bytes memory chunk to b copied, the rest of the word can be read`
29			`! without side effects.`
30			`! This could be easily changed by increasing the minumum size of`
31			`! a fast memcpy and the amount subtracted from r7 before L_2l_loop be 2,`
32			`! however, this would cost a few extra cyles on average.`
33			`! For SHmedia, the assumption is that any quadword can be read in its`
34			`! enirety if at least one byte is included in the copy.`
35			`!`
36
37			`#include "asm.h"`
38
39			`ENTRY(memcpy)`
40
41			`#if __SHMEDIA__`
42
43			`#define LDUAQ(P,O,D0,D1) ldlo.q P,O,D0; ldhi.q P,O+7,D1`
44			`#define STUAQ(P,O,D0,D1) stlo.q P,O,D0; sthi.q P,O+7,D1`
45			`#define LDUAL(P,O,D0,D1) ldlo.l P,O,D0; ldhi.l P,O+3,D1`
46			`#define STUAL(P,O,D0,D1) stlo.l P,O,D0; sthi.l P,O+3,D1`
47
48			`ld.b r3,0,r63`
49			`pta/l Large,tr0`
50			`movi 25,r0`
51			`bgeu/u r4,r0,tr0`
52			`nsb r4,r0`
53			`shlli r0,5,r0`
54			`movi (L1-L0+63*32 + 1) & 0xffff,r1`
55			`sub r1, r0, r0`
56			`L0: ptrel r0,tr0`
57			`add r2,r4,r5`
58			`ptabs r18,tr1`
59			`add r3,r4,r6`
60			`blink tr0,r63`
61
62			`.balign 8`
63			`L1:`
64			`/* 0 byte memcpy */`
65			`blink tr1,r63`
66
67			`L4_7: /* 4..7 byte memcpy cntd. */`
68			`stlo.l r2, 0, r0`
69			`or r6, r7, r6`
70			`sthi.l r5, -1, r6`
71			`stlo.l r5, -4, r6`
72			`blink tr1,r63`
73
74			`L2_3: /* 2 or 3 byte memcpy cntd. */`
75			`st.b r5,-1,r6`
76			`blink tr1,r63`
77
78			`/* 1 byte memcpy */`
79			`ld.b r3,0,r0`
80			`st.b r2,0,r0`
81			`blink tr1,r63`
82
83			`L8_15: /* 8..15 byte memcpy cntd. */`
84			`stlo.q r2, 0, r0`
85			`or r6, r7, r6`
86			`sthi.q r5, -1, r6`
87			`stlo.q r5, -8, r6`
88			`blink tr1,r63`
89
90			`/* 2 or 3 byte memcpy */`
91			`ld.b r3,0,r0`
92			`ld.b r2,0,r63`
93			`ld.b r3,1,r1`
94			`st.b r2,0,r0`
95			`pta/l L2_3,tr0`
96			`ld.b r6,-1,r6`
97			`st.b r2,1,r1`
98			`blink tr0, r63`
99
100			`/* 4 .. 7 byte memcpy */`
101			`LDUAL (r3, 0, r0, r1)`
102			`pta L4_7, tr0`
103			`ldlo.l r6, -4, r7`
104			`or r0, r1, r0`
105			`sthi.l r2, 3, r0`
106			`ldhi.l r6, -1, r6`
107			`blink tr0, r63`
108
109			`/* 8 .. 15 byte memcpy */`
110			`LDUAQ (r3, 0, r0, r1)`
111			`pta L8_15, tr0`
112			`ldlo.q r6, -8, r7`
113			`or r0, r1, r0`
114			`sthi.q r2, 7, r0`
115			`ldhi.q r6, -1, r6`
116			`blink tr0, r63`
117
118			`/* 16 .. 24 byte memcpy */`
119			`LDUAQ (r3, 0, r0, r1)`
120			`LDUAQ (r3, 8, r8, r9)`
121			`or r0, r1, r0`
122			`sthi.q r2, 7, r0`
123			`or r8, r9, r8`
124			`sthi.q r2, 15, r8`
125			`ldlo.q r6, -8, r7`
126			`ldhi.q r6, -1, r6`
127			`stlo.q r2, 8, r8`
128			`stlo.q r2, 0, r0`
129			`or r6, r7, r6`
130			`sthi.q r5, -1, r6`
131			`stlo.q r5, -8, r6`
132			`blink tr1,r63`
133
134			`Large:`
135			`ld.b r2, 0, r63`
136			`pta/l Loop_ua, tr1`
137			`ori r3, -8, r7`
138			`sub r2, r7, r22`
139			`sub r3, r2, r6`
140			`add r2, r4, r5`
141			`ldlo.q r3, 0, r0`
142			`addi r5, -16, r5`
143			`movi 64+8, r27 // could subtract r7 from that.`
144			`stlo.q r2, 0, r0`
145			`sthi.q r2, 7, r0`
146			`ldx.q r22, r6, r0`
147			`bgtu/l r27, r4, tr1`
148
149			`addi r5, -48, r27`
150			`pta/l Loop_line, tr0`
151			`addi r6, 64, r36`
152			`addi r6, -24, r19`
153			`addi r6, -16, r20`
154			`addi r6, -8, r21`
155
156			`Loop_line:`
157			`ldx.q r22, r36, r63`
158			`alloco r22, 32`
159			`addi r22, 32, r22`
160			`ldx.q r22, r19, r23`
161			`sthi.q r22, -25, r0`
162			`ldx.q r22, r20, r24`
163			`ldx.q r22, r21, r25`
164			`stlo.q r22, -32, r0`
165			`ldx.q r22, r6, r0`
166			`sthi.q r22, -17, r23`
167			`sthi.q r22, -9, r24`
168			`sthi.q r22, -1, r25`
169			`stlo.q r22, -24, r23`
170			`stlo.q r22, -16, r24`
171			`stlo.q r22, -8, r25`
172			`bgeu r27, r22, tr0`
173
174			`Loop_ua:`
175			`addi r22, 8, r22`
176			`sthi.q r22, -1, r0`
177			`stlo.q r22, -8, r0`
178			`ldx.q r22, r6, r0`
179			`bgtu/l r5, r22, tr1`
180
181			`add r3, r4, r7`
182			`ldlo.q r7, -8, r1`
183			`sthi.q r22, 7, r0`
184			`ldhi.q r7, -1, r7`
185			`ptabs r18,tr1`
186			`stlo.q r22, 0, r0`
187			`or r1, r7, r1`
188			`sthi.q r5, 15, r1`
189			`stlo.q r5, 8, r1`
190			`blink tr1, r63`
191
192			`#else /* ! SHMEDIA, i.e. SH1 .. SH4 / SHcompact */`
193
194			`#ifdef __SH5__`
195			`#define DST r2`
196			`#define SRC r3`
197			`#define COUNT r4`
198			`#define TMP0 r5`
199			`#define TMP1 r6`
200			`#define RESULT r2`
201			`#else`
202			`#define DST r4`
203			`#define SRC r5`
204			`#define COUNT r6`
205			`#define TMP0 r2`
206			`#define TMP1 r3`
207			`#define RESULT r0`
208			`#endif`
209
210			`#ifdef __LITTLE_ENDIAN__`
211			`! Little endian version copies with increasing addresses.`
212			`mov DST,TMP1 ! Save return value`
213			`mov #11,r0 ! Check if small number of bytes`
214			`cmp/hs r0,COUNT`
215			`! COUNT becomes src end address`
216			`SL(bf, L_small, add SRC,COUNT)`
217			`mov #1,r1`
218			`tst r1,SRC ! check if source even`
219			`SL(bt, L_even, mov COUNT,r7)`
220			`mov.b @SRC+,r0 ! no, make it even.`
221			`mov.b r0,@DST`
222			`add #1,DST`
223			`L_even: tst r1,DST ! check if destination is even`
224			`add #-3,r7`
225			`SL(bf, L_odddst, mov #2,r1)`
226			`tst r1,DST ! check if destination is 4-byte aligned`
227			`mov DST,r0`
228			`SL(bt, L_al4dst, sub SRC,r0)`
229			`mov.w @SRC+,TMP0`
230			`mov.w TMP0,@DST`
231			`! add #2,DST DST is dead here.`
232			`L_al4dst:`
233			`tst r1,SRC`
234			`bt L_al4both`
235			`mov.w @SRC+,r1`
236			`swap.w r1,r1`
237			`add #-6,r0`
238			`add #-6,r7 ! r7 := src end address minus 9.`
239			`.align 2`
240			`L_2l_loop:`
241			`mov.l @SRC+,TMP0 ! Read & write two longwords per iteration`
242			`xtrct TMP0,r1`
243			`mov.l r1,@(r0,SRC)`
244			`cmp/hs r7,SRC`
245			`mov.l @SRC+,r1`
246			`xtrct r1,TMP0`
247			`mov.l TMP0,@(r0,SRC)`
248			`bf L_2l_loop`
249			`add #-2,SRC`
250			`bra L_cleanup`
251			`add #5,r0`
252			`L_al4both:`
253			`add #-4,r0`
254			`.align 2`
255			`L_al4both_loop:`
256			`mov.l @SRC+,DST ! Read longword, write longword per iteration`
257			`cmp/hs r7,SRC`
258			`SL(bf, L_al4both_loop, mov.l DST,@(r0,SRC))`
259
260			`bra L_cleanup`
261			`add #3,r0`
262
263			`L_odddst:`
264			`tst r1,SRC`
265			`SL(bt, L_al4src, add #-1,DST)`
266			`mov.w @SRC+,r0`
267			`mov.b r0,@(1,DST)`
268			`shlr8 r0`
269			`mov.b r0,@(2,DST)`
270			`add #2,DST`
271			`L_al4src:`
272			`.align 2`
273			`L_odd_loop:`
274			`mov.l @SRC+,r0 ! Read longword, write byte, word, byte per iteration`
275			`cmp/hs r7,SRC`
276			`mov.b r0,@(1,DST)`
277			`shlr8 r0`
278			`mov.w r0,@(2,DST)`
279			`shlr16 r0`
280			`mov.b r0,@(4,DST)`
281			`SL(bf, L_odd_loop, add #4,DST)`
282			`.align 2 ! avoid nop in more frequently executed code.`
283			`L_cleanup2:`
284			`mov DST,r0`
285			`sub SRC,r0`
286			`L_cleanup:`
287			`cmp/eq COUNT,SRC`
288			`bt L_ready`
289			`.align 2`
290			`L_cleanup_loop:`
291			`mov.b @SRC+,r1`
292			`cmp/eq COUNT,SRC`
293			`mov.b r1,@(r0,SRC)`
294			`bf L_cleanup_loop`
295			`L_ready:`
296			`rts`
297			`mov TMP1,RESULT`
298			`L_small:`
299			`bra L_cleanup2`
300			`add #-1,DST`
301			`#else /* ! __LITTLE_ENDIAN__ */`
302			`! Big endian version copies with decreasing addresses.`
303			`mov DST,r0`
304			`add COUNT,r0`
305			`sub DST,SRC`
306			`mov #11,r1`
307			`cmp/hs r1,COUNT`
308			`SL(bf, L_small, add #-1,SRC)`
309			`mov SRC,TMP1`
310			`add r0,TMP1`
311			`shlr TMP1`
312			`SL(bt, L_even,`
313			`mov DST,r7)`
314			`mov.b @(r0,SRC),TMP0`
315			`add #-1,TMP1`
316			`mov.b TMP0,@-r0`
317			`L_even:`
318			`tst #1,r0`
319			`add #-1,SRC`
320			`SL(bf, L_odddst, add #8,r7)`
321			`tst #2,r0`
322			`bt L_al4dst`
323			`add #-1,TMP1`
324			`mov.w @(r0,SRC),r1`
325			`mov.w r1,@-r0`
326			`L_al4dst:`
327			`shlr TMP1`
328			`bt L_al4both`
329			`mov.w @(r0,SRC),r1`
330			`swap.w r1,r1`
331			`add #4,r7`
332			`add #-4,SRC`
333			`.align 2`
334			`L_2l_loop:`
335			`mov.l @(r0,SRC),TMP0`
336			`xtrct TMP0,r1`
337			`mov.l r1,@-r0`
338			`cmp/hs r7,r0`
339			`mov.l @(r0,SRC),r1`
340			`xtrct r1,TMP0`
341			`mov.l TMP0,@-r0`
342			`bt L_2l_loop`
343			`bra L_cleanup`
344			`add #5,SRC`
345
346			`nop ! avoid nop in executed code.`
347			`L_al4both:`
348			`add #-2,SRC`
349			`.align 2`
350			`L_al4both_loop:`
351			`mov.l @(r0,SRC),r1`
352			`cmp/hs r7,r0`
353			`SL(bt, L_al4both_loop,`
354			`mov.l r1,@-r0)`
355			`bra L_cleanup`
356			`add #3,SRC`
357
358			`nop ! avoid nop in executed code.`
359			`L_odddst:`
360			`shlr TMP1`
361			`bt L_al4src`
362			`mov.w @(r0,SRC),r1`
363			`mov.b r1,@-r0`
364			`shlr8 r1`
365			`mov.b r1,@-r0`
366			`L_al4src:`
367			`add #-2,SRC`
368			`.align 2`
369			`L_odd_loop:`
370			`mov.l @(r0,SRC),TMP0`
371			`cmp/hs r7,r0`
372			`mov.b TMP0,@-r0`
373			`shlr8 TMP0`
374			`mov.w TMP0,@-r0`
375			`shlr16 TMP0`
376			`mov.b TMP0,@-r0`
377			`bt L_odd_loop`
378
379			`add #3,SRC`
380			`L_cleanup:`
381			`L_small:`
382			`cmp/eq DST,r0`
383			`bt L_ready`
384			`add #1,DST`
385			`.align 2`
386			`L_cleanup_loop:`
387			`mov.b @(r0,SRC),TMP0`
388			`cmp/eq DST,r0`
389			`mov.b TMP0,@-r0`
390			`bf L_cleanup_loop`
391			`L_ready:`
392			`rts`
393			`mov r0,RESULT`
394			`#endif /* ! __LITTLE_ENDIAN__ */`
395			`#endif /* ! SHMEDIA */`