Source code
Revision control
Copy as Markdown
Other Tools
/*
* Copyright (c) 2012
* MIPS Technologies, Inc., California.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "pixman-mips-dspr2-asm.h"
/*
* This routine could be optimized for MIPS64. The current code only
* uses MIPS32 instructions.
*/
#ifdef EB
# define LWHI lwl /* high part is left in big-endian */
# define SWHI swl /* high part is left in big-endian */
# define LWLO lwr /* low part is right in big-endian */
# define SWLO swr /* low part is right in big-endian */
#else
# define LWHI lwr /* high part is right in little-endian */
# define SWHI swr /* high part is right in little-endian */
# define LWLO lwl /* low part is left in big-endian */
# define SWLO swl /* low part is left in big-endian */
#endif
LEAF_MIPS32R2(pixman_mips_fast_memcpy)
slti AT, a2, 8
bne AT, zero, $last8
move v0, a0 /* memcpy returns the dst pointer */
/* Test if the src and dst are word-aligned, or can be made word-aligned */
xor t8, a1, a0
andi t8, t8, 0x3 /* t8 is a0/a1 word-displacement */
bne t8, zero, $unaligned
negu a3, a0
andi a3, a3, 0x3 /* we need to copy a3 bytes to make a0/a1 aligned */
beq a3, zero, $chk16w /* when a3=0 then the dst (a0) is word-aligned */
subu a2, a2, a3 /* now a2 is the remining bytes count */
LWHI t8, 0(a1)
addu a1, a1, a3
SWHI t8, 0(a0)
addu a0, a0, a3
/* Now the dst/src are mutually word-aligned with word-aligned addresses */
$chk16w: andi t8, a2, 0x3f /* any whole 64-byte chunks? */
/* t8 is the byte count after 64-byte chunks */
beq a2, t8, $chk8w /* if a2==t8, no 64-byte chunks */
/* There will be at most 1 32-byte chunk after it */
subu a3, a2, t8 /* subtract from a2 the reminder */
/* Here a3 counts bytes in 16w chunks */
addu a3, a0, a3 /* Now a3 is the final dst after 64-byte chunks */
addu t0, a0, a2 /* t0 is the "past the end" address */
/*
* When in the loop we exercise "pref 30, x(a0)", the a0+x should not be past
* the "t0-32" address
* This means: for x=128 the last "safe" a0 address is "t0-160"
* Alternatively, for x=64 the last "safe" a0 address is "t0-96"
* In the current version we use "pref 30, 128(a0)", so "t0-160" is the limit
*/
subu t9, t0, 160 /* t9 is the "last safe pref 30, 128(a0)" address */
pref 0, 0(a1) /* bring the first line of src, addr 0 */
pref 0, 32(a1) /* bring the second line of src, addr 32 */
pref 0, 64(a1) /* bring the third line of src, addr 64 */
pref 30, 32(a0) /* safe, as we have at least 64 bytes ahead */
/* In case the a0 > t9 don't use "pref 30" at all */
sgtu v1, a0, t9
bgtz v1, $loop16w /* skip "pref 30, 64(a0)" for too short arrays */
nop
/* otherwise, start with using pref30 */
pref 30, 64(a0)
$loop16w:
pref 0, 96(a1)
lw t0, 0(a1)
bgtz v1, $skip_pref30_96 /* skip "pref 30, 96(a0)" */
lw t1, 4(a1)
pref 30, 96(a0) /* continue setting up the dest, addr 96 */
$skip_pref30_96:
lw t2, 8(a1)
lw t3, 12(a1)
lw t4, 16(a1)
lw t5, 20(a1)
lw t6, 24(a1)
lw t7, 28(a1)
pref 0, 128(a1) /* bring the next lines of src, addr 128 */
sw t0, 0(a0)
sw t1, 4(a0)
sw t2, 8(a0)
sw t3, 12(a0)
sw t4, 16(a0)
sw t5, 20(a0)
sw t6, 24(a0)
sw t7, 28(a0)
lw t0, 32(a1)
bgtz v1, $skip_pref30_128 /* skip "pref 30, 128(a0)" */
lw t1, 36(a1)
pref 30, 128(a0) /* continue setting up the dest, addr 128 */
$skip_pref30_128:
lw t2, 40(a1)
lw t3, 44(a1)
lw t4, 48(a1)
lw t5, 52(a1)
lw t6, 56(a1)
lw t7, 60(a1)
pref 0, 160(a1) /* bring the next lines of src, addr 160 */
sw t0, 32(a0)
sw t1, 36(a0)
sw t2, 40(a0)
sw t3, 44(a0)
sw t4, 48(a0)
sw t5, 52(a0)
sw t6, 56(a0)
sw t7, 60(a0)
addiu a0, a0, 64 /* adding 64 to dest */
sgtu v1, a0, t9
bne a0, a3, $loop16w
addiu a1, a1, 64 /* adding 64 to src */
move a2, t8
/* Here we have src and dest word-aligned but less than 64-bytes to go */
$chk8w:
pref 0, 0x0(a1)
andi t8, a2, 0x1f /* is there a 32-byte chunk? */
/* the t8 is the reminder count past 32-bytes */
beq a2, t8, $chk1w /* when a2=t8, no 32-byte chunk */
nop
lw t0, 0(a1)
lw t1, 4(a1)
lw t2, 8(a1)
lw t3, 12(a1)
lw t4, 16(a1)
lw t5, 20(a1)
lw t6, 24(a1)
lw t7, 28(a1)
addiu a1, a1, 32
sw t0, 0(a0)
sw t1, 4(a0)
sw t2, 8(a0)
sw t3, 12(a0)
sw t4, 16(a0)
sw t5, 20(a0)
sw t6, 24(a0)
sw t7, 28(a0)
addiu a0, a0, 32
$chk1w:
andi a2, t8, 0x3 /* now a2 is the reminder past 1w chunks */
beq a2, t8, $last8
subu a3, t8, a2 /* a3 is count of bytes in 1w chunks */
addu a3, a0, a3 /* now a3 is the dst address past the 1w chunks */
/* copying in words (4-byte chunks) */
$wordCopy_loop:
lw t3, 0(a1) /* the first t3 may be equal t0 ... optimize? */
addiu a1, a1, 4
addiu a0, a0, 4
bne a0, a3, $wordCopy_loop
sw t3, -4(a0)
/* For the last (<8) bytes */
$last8:
blez a2, leave
addu a3, a0, a2 /* a3 is the last dst address */
$last8loop:
lb v1, 0(a1)
addiu a1, a1, 1
addiu a0, a0, 1
bne a0, a3, $last8loop
sb v1, -1(a0)
leave: j ra
nop
/*
* UNALIGNED case
*/
$unaligned:
/* got here with a3="negu a0" */
andi a3, a3, 0x3 /* test if the a0 is word aligned */
beqz a3, $ua_chk16w
subu a2, a2, a3 /* bytes left after initial a3 bytes */
LWHI v1, 0(a1)
LWLO v1, 3(a1)
addu a1, a1, a3 /* a3 may be here 1, 2 or 3 */
SWHI v1, 0(a0)
addu a0, a0, a3 /* below the dst will be word aligned (NOTE1) */
$ua_chk16w: andi t8, a2, 0x3f /* any whole 64-byte chunks? */
/* t8 is the byte count after 64-byte chunks */
beq a2, t8, $ua_chk8w /* if a2==t8, no 64-byte chunks */
/* There will be at most 1 32-byte chunk after it */
subu a3, a2, t8 /* subtract from a2 the reminder */
/* Here a3 counts bytes in 16w chunks */
addu a3, a0, a3 /* Now a3 is the final dst after 64-byte chunks */
addu t0, a0, a2 /* t0 is the "past the end" address */
subu t9, t0, 160 /* t9 is the "last safe pref 30, 128(a0)" address */
pref 0, 0(a1) /* bring the first line of src, addr 0 */
pref 0, 32(a1) /* bring the second line of src, addr 32 */
pref 0, 64(a1) /* bring the third line of src, addr 64 */
pref 30, 32(a0) /* safe, as we have at least 64 bytes ahead */
/* In case the a0 > t9 don't use "pref 30" at all */
sgtu v1, a0, t9
bgtz v1, $ua_loop16w /* skip "pref 30, 64(a0)" for too short arrays */
nop
/* otherwise, start with using pref30 */
pref 30, 64(a0)
$ua_loop16w:
pref 0, 96(a1)
LWHI t0, 0(a1)
LWLO t0, 3(a1)
LWHI t1, 4(a1)
bgtz v1, $ua_skip_pref30_96
LWLO t1, 7(a1)
pref 30, 96(a0) /* continue setting up the dest, addr 96 */
$ua_skip_pref30_96:
LWHI t2, 8(a1)
LWLO t2, 11(a1)
LWHI t3, 12(a1)
LWLO t3, 15(a1)
LWHI t4, 16(a1)
LWLO t4, 19(a1)
LWHI t5, 20(a1)
LWLO t5, 23(a1)
LWHI t6, 24(a1)
LWLO t6, 27(a1)
LWHI t7, 28(a1)
LWLO t7, 31(a1)
pref 0, 128(a1) /* bring the next lines of src, addr 128 */
sw t0, 0(a0)
sw t1, 4(a0)
sw t2, 8(a0)
sw t3, 12(a0)
sw t4, 16(a0)
sw t5, 20(a0)
sw t6, 24(a0)
sw t7, 28(a0)
LWHI t0, 32(a1)
LWLO t0, 35(a1)
LWHI t1, 36(a1)
bgtz v1, $ua_skip_pref30_128
LWLO t1, 39(a1)
pref 30, 128(a0) /* continue setting up the dest, addr 128 */
$ua_skip_pref30_128:
LWHI t2, 40(a1)
LWLO t2, 43(a1)
LWHI t3, 44(a1)
LWLO t3, 47(a1)
LWHI t4, 48(a1)
LWLO t4, 51(a1)
LWHI t5, 52(a1)
LWLO t5, 55(a1)
LWHI t6, 56(a1)
LWLO t6, 59(a1)
LWHI t7, 60(a1)
LWLO t7, 63(a1)
pref 0, 160(a1) /* bring the next lines of src, addr 160 */
sw t0, 32(a0)
sw t1, 36(a0)
sw t2, 40(a0)
sw t3, 44(a0)
sw t4, 48(a0)
sw t5, 52(a0)
sw t6, 56(a0)
sw t7, 60(a0)
addiu a0, a0, 64 /* adding 64 to dest */
sgtu v1, a0, t9
bne a0, a3, $ua_loop16w
addiu a1, a1, 64 /* adding 64 to src */
move a2, t8
/* Here we have src and dest word-aligned but less than 64-bytes to go */
$ua_chk8w:
pref 0, 0x0(a1)
andi t8, a2, 0x1f /* is there a 32-byte chunk? */
/* the t8 is the reminder count */
beq a2, t8, $ua_chk1w /* when a2=t8, no 32-byte chunk */
LWHI t0, 0(a1)
LWLO t0, 3(a1)
LWHI t1, 4(a1)
LWLO t1, 7(a1)
LWHI t2, 8(a1)
LWLO t2, 11(a1)
LWHI t3, 12(a1)
LWLO t3, 15(a1)
LWHI t4, 16(a1)
LWLO t4, 19(a1)
LWHI t5, 20(a1)
LWLO t5, 23(a1)
LWHI t6, 24(a1)
LWLO t6, 27(a1)
LWHI t7, 28(a1)
LWLO t7, 31(a1)
addiu a1, a1, 32
sw t0, 0(a0)
sw t1, 4(a0)
sw t2, 8(a0)
sw t3, 12(a0)
sw t4, 16(a0)
sw t5, 20(a0)
sw t6, 24(a0)
sw t7, 28(a0)
addiu a0, a0, 32
$ua_chk1w:
andi a2, t8, 0x3 /* now a2 is the reminder past 1w chunks */
beq a2, t8, $ua_smallCopy
subu a3, t8, a2 /* a3 is count of bytes in 1w chunks */
addu a3, a0, a3 /* now a3 is the dst address past the 1w chunks */
/* copying in words (4-byte chunks) */
$ua_wordCopy_loop:
LWHI v1, 0(a1)
LWLO v1, 3(a1)
addiu a1, a1, 4
addiu a0, a0, 4 /* note: dst=a0 is word aligned here, see NOTE1 */
bne a0, a3, $ua_wordCopy_loop
sw v1, -4(a0)
/* Now less than 4 bytes (value in a2) left to copy */
$ua_smallCopy:
beqz a2, leave
addu a3, a0, a2 /* a3 is the last dst address */
$ua_smallCopy_loop:
lb v1, 0(a1)
addiu a1, a1, 1
addiu a0, a0, 1
bne a0, a3, $ua_smallCopy_loop
sb v1, -1(a0)
j ra
nop
END(pixman_mips_fast_memcpy)