AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-12-02 01:40:07 +00:00
Code Issues Packages Projects Releases Wiki Activity
dff8da6b3e
glibc/sysdeps/powerpc/powerpc64/power6/memcpy.S

1500 lines
32 KiB
ArmAsm
Raw Blame History

/* Optimized memcpy implementation for PowerPC64.
Copyright (C) 2003-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
/* void * [r3] memcpy (void *dst [r3], void *src [r4], size_t len [r5]);
Returns 'dst'.
Memcpy handles short copies (< 32-bytes) using a binary move blocks
(no loops) of lwz/stw. The tail (remaining 1-3) bytes is handled
with the appropriate combination of byte and halfword load/stores.
There is minimal effort to optimize the alignment of short moves.
The 64-bit implementations of POWER3 and POWER4 do a reasonable job
of handling unaligned load/stores that do not cross 32-byte boundaries.
Longer moves (>= 32-bytes) justify the effort to get at least the
destination doubleword (8-byte) aligned. Further optimization is
possible when both source and destination are doubleword aligned.
Each case has a optimized unrolled loop.
For POWER6 unaligned loads will take a 20+ cycle hiccup for any
L1 cache miss that crosses a 32- or 128-byte boundary. Store
is more forgiving and does not take a hiccup until page or
segment boundaries. So we require doubleword alignment for
the source but may take a risk and only require word alignment
for the destination. */
#ifndef MEMCPY
# define MEMCPY memcpy
#endif
.machine "power6"
ENTRY_TOCLESS (MEMCPY, 7)
CALL_MCOUNT 3
cmpldi cr1,5,31
neg 0,3
std 3,-16(1)
std 31,-8(1)
andi. 11,3,7 /* check alignment of dst. */
clrldi 0,0,61 /* Number of bytes until the 1st doubleword of dst. */
clrldi 10,4,61 /* check alignment of src. */
cmpldi cr6,5,8
ble- cr1,.L2 /* If move < 32 bytes use short move code. */
mtcrf 0x01,0
cmpld cr6,10,11
srdi 9,5,3 /* Number of full double words remaining. */
beq .L0
subf 5,0,5
/* Move 0-7 bytes as needed to get the destination doubleword aligned.
Duplicate some code to maximize fall-through and minimize agen delays. */
1: bf 31,2f
lbz 6,0(4)
stb 6,0(3)
bf 30,5f
lhz 6,1(4)
sth 6,1(3)
bf 29,0f
lwz 6,3(4)
stw 6,3(3)
b 0f
5:
bf 29,0f
lwz 6,1(4)
stw 6,1(3)
b 0f
2: bf 30,4f
lhz 6,0(4)
sth 6,0(3)
bf 29,0f
lwz 6,2(4)
stw 6,2(3)
b 0f
4: bf 29,0f
lwz 6,0(4)
stw 6,0(3)
0:
/* Add the number of bytes until the 1st doubleword of dst to src and dst. */
add 4,4,0
add 3,3,0
clrldi 10,4,61 /* check alignment of src again. */
srdi 9,5,3 /* Number of full double words remaining. */
/* Copy doublewords from source to destination, assuming the
destination is aligned on a doubleword boundary.
At this point we know there are at least 25 bytes left (32-7) to copy.
The next step is to determine if the source is also doubleword aligned.
If not branch to the unaligned move code at .L6. which uses
a load, shift, store strategy.
Otherwise source and destination are doubleword aligned, and we can
the optimized doubleword copy loop. */
.align 4
.L0:
clrldi 11,5,61
andi. 0,5,0x78
srdi 12,5,7 /* Number of 128-byte blocks to move. */
cmpldi cr1,11,0 /* If the tail is 0 bytes */
bne- cr6,.L6 /* If source is not DW aligned. */
/* Move doublewords where destination and source are DW aligned.
Use a unrolled loop to copy 16 doublewords (128-bytes) per iteration.
If the copy is not an exact multiple of 128 bytes, 1-15
doublewords are copied as needed to set up the main loop. After
the main loop exits there may be a tail of 1-7 bytes. These byte
are copied a word/halfword/byte at a time as needed to preserve
alignment.
For POWER6 the L1 is store-through and the L2 is store-in. The
L2 is clocked at half CPU clock so we can store 16 bytes every
other cycle. POWER6 also has a load/store bypass so we can do
load, load, store, store every 2 cycles.
The following code is sensitive to cache line alignment. Do not
make any change with out first making sure they don't result in
splitting ld/std pairs across a cache line. */
mtcrf 0x02,5
mtcrf 0x01,5
cmpldi cr5,12,1
beq L(das_loop)
bf 25,4f
.align 3
ld 6,0(4)
ld 7,8(4)
mr 11,4
mr 10,3
std 6,0(3)
std 7,8(3)
ld 6,16(4)
ld 7,24(4)
std 6,16(3)
std 7,24(3)
ld 6,0+32(4)
ld 7,8+32(4)
addi 4,4,64
addi 3,3,64
std 6,0+32(10)
std 7,8+32(10)
ld 6,16+32(11)
ld 7,24+32(11)
std 6,16+32(10)
std 7,24+32(10)
4:
mr 10,3
bf 26,2f
ld 6,0(4)
ld 7,8(4)
mr 11,4
nop
std 6,0(3)
std 7,8(3)
ld 6,16(4)
ld 7,24(4)
addi 4,4,32
std 6,16(3)
std 7,24(3)
addi 3,3,32
6:
nop
bf 27,5f
ld 6,0+32(11)
ld 7,8+32(11)
addi 4,4,16
addi 3,3,16
std 6,0+32(10)
std 7,8+32(10)
bf 28,L(das_loop_s)
ld 0,16+32(11)
addi 4,4,8
addi 3,3,8
std 0,16+32(10)
blt cr5,L(das_tail)
b L(das_loop)
.align 3
5:
nop
bf 28,L(das_loop_s)
ld 6,32(11)
addi 4,4,8
addi 3,3,8
std 6,32(10)
blt cr5,L(das_tail)
b L(das_loop)
.align 3
2:
mr 11,4
bf 27,1f
ld 6,0(4)
ld 7,8(4)
addi 4,4,16
addi 3,3,16
std 6,0(10)
std 7,8(10)
bf 28,L(das_loop_s)
ld 0,16(11)
addi 4,11,24
addi 3,10,24
std 0,16(10)
blt cr5,L(das_tail)
b L(das_loop)
.align 3
1:
nop
bf 28,L(das_loop_s)
ld 6,0(4)
addi 4,4,8
addi 3,3,8
std 6,0(10)
L(das_loop_s):
nop
blt cr5,L(das_tail)
.align 4
L(das_loop):
ld 6,0(4)
ld 7,8(4)
mr 10,3
mr 11,4
std 6,0(3)
std 7,8(3)
addi 12,12,-1
nop
ld 8,16(4)
ld 0,24(4)
std 8,16(3)
std 0,24(3)
ld 6,0+32(4)
ld 7,8+32(4)
std 6,0+32(3)
std 7,8+32(3)
ld 8,16+32(4)
ld 0,24+32(4)
std 8,16+32(3)
std 0,24+32(3)
ld 6,0+64(11)
ld 7,8+64(11)
std 6,0+64(10)
std 7,8+64(10)
ld 8,16+64(11)
ld 0,24+64(11)
std 8,16+64(10)
std 0,24+64(10)
ld 6,0+96(11)
ld 7,8+96(11)
addi 4,4,128
addi 3,3,128
std 6,0+96(10)
std 7,8+96(10)
ld 8,16+96(11)
ld 0,24+96(11)
std 8,16+96(10)
std 0,24+96(10)
ble cr5,L(das_loop_e)
mtctr 12
.align 4
L(das_loop2):
ld 6,0(4)
ld 7,8(4)
mr 10,3
mr 11,4
std 6,0(3)
std 7,8(3)
ld 8,16(4)
ld 0,24(4)
std 8,16(3)
std 0,24(3)
ld 6,0+32(4)
ld 7,8+32(4)
std 6,0+32(3)
std 7,8+32(3)
ld 8,16+32(4)
ld 0,24+32(4)
std 8,16+32(3)
std 0,24+32(3)
ld 6,0+64(11)
ld 7,8+64(11)
std 6,0+64(10)
std 7,8+64(10)
ld 8,16+64(11)
ld 0,24+64(11)
std 8,16+64(10)
std 0,24+64(10)
ld 6,0+96(11)
ld 7,8+96(11)
addi 4,4,128
addi 3,3,128
std 6,0+96(10)
std 7,8+96(10)
ld 8,16+96(11)
ld 0,24+96(11)
std 8,16+96(10)
std 0,24+96(10)
bdnz L(das_loop2)
L(das_loop_e):
/* Check of a 1-7 byte tail, return if none. */
bne cr1,L(das_tail2)
/* Return original dst pointer. */
ld 3,-16(1)
blr
.align 4
L(das_tail):
beq cr1,0f
L(das_tail2):
/* At this point we have a tail of 0-7 bytes and we know that the
destination is double word aligned. */
4: bf 29,2f
lwz 6,0(4)
stw 6,0(3)
bf 30,5f
lhz 6,4(4)
sth 6,4(3)
bf 31,0f
lbz 6,6(4)
stb 6,6(3)
b 0f
5: bf 31,0f
lbz 6,4(4)
stb 6,4(3)
b 0f
2: bf 30,1f
lhz 6,0(4)
sth 6,0(3)
bf 31,0f
lbz 6,2(4)
stb 6,2(3)
b 0f
1: bf 31,0f
lbz 6,0(4)
stb 6,0(3)
0:
/* Return original dst pointer. */
ld 3,-16(1)
blr
/* Copy up to 31 bytes. This divided into two cases 0-8 bytes and 9-31
bytes. Each case is handled without loops, using binary (1,2,4,8)
tests.
In the short (0-8 byte) case no attempt is made to force alignment
of either source or destination. The hardware will handle the
unaligned load/stores with small delays for crossing 32- 128-byte,
and 4096-byte boundaries. Since these short moves are unlikely to be
unaligned or cross these boundaries, the overhead to force
alignment is not justified.
The longer (9-31 byte) move is more likely to cross 32- or 128-byte
boundaries. Since only loads are sensitive to the 32-/128-byte
boundaries it is more important to align the source then the
destination. If the source is not already word aligned, we first
move 1-3 bytes as needed. Since we are only word aligned we don't
use double word load/stores to insure that all loads are aligned.
While the destination and stores may still be unaligned, this
is only an issue for page (4096 byte boundary) crossing, which
should be rare for these short moves. The hardware handles this
case automatically with a small (~20 cycle) delay. */
.align 4
.L2:
mtcrf 0x01,5
neg 8,4
clrrdi 11,4,2
andi. 0,8,3
ble cr6,.LE8 /* Handle moves of 0-8 bytes. */
/* At least 9 bytes left. Get the source word aligned. */
cmpldi cr1,5,16
mr 10,5
mr 12,4
cmpldi cr6,0,2
beq L(dus_tail) /* If the source is already word aligned skip this. */
/* Copy 1-3 bytes to get source address word aligned. */
lwz 6,0(11)
subf 10,0,5
add 12,4,0
blt cr6,5f
srdi 7,6,16
bgt cr6,3f
#ifdef __LITTLE_ENDIAN__
sth 7,0(3)
#else
sth 6,0(3)
#endif
b 7f
.align 4
3:
#ifdef __LITTLE_ENDIAN__
rotlwi 6,6,24
stb 6,0(3)
sth 7,1(3)
#else
stb 7,0(3)
sth 6,1(3)
#endif
b 7f
.align 4
5:
#ifdef __LITTLE_ENDIAN__
rotlwi 6,6,8
#endif
stb 6,0(3)
7:
cmpldi cr1,10,16
add 3,3,0
mtcrf 0x01,10
.align 4
L(dus_tail):
/* At least 6 bytes left and the source is word aligned. This allows
some speculative loads up front. */
/* We need to special case the fall-through because the biggest delays
are due to address computation not being ready in time for the
AGEN. */
lwz 6,0(12)
lwz 7,4(12)
blt cr1,L(dus_tail8)
cmpldi cr0,10,24
L(dus_tail16): /* Move 16 bytes. */
stw 6,0(3)
stw 7,4(3)
lwz 6,8(12)
lwz 7,12(12)
stw 6,8(3)
stw 7,12(3)
/* Move 8 bytes more. */
bf 28,L(dus_tail16p8)
cmpldi cr1,10,28
lwz 6,16(12)
lwz 7,20(12)
stw 6,16(3)
stw 7,20(3)
/* Move 4 bytes more. */
bf 29,L(dus_tail16p4)
lwz 6,24(12)
stw 6,24(3)
addi 12,12,28
addi 3,3,28
bgt cr1,L(dus_tail2)
/* exactly 28 bytes. Return original dst pointer and exit. */
ld 3,-16(1)
blr
.align 4
L(dus_tail16p8): /* less than 8 bytes left. */
beq cr1,L(dus_tailX) /* exactly 16 bytes, early exit. */
cmpldi cr1,10,20
bf 29,L(dus_tail16p2)
/* Move 4 bytes more. */
lwz 6,16(12)
stw 6,16(3)
addi 12,12,20
addi 3,3,20
bgt cr1,L(dus_tail2)
/* exactly 20 bytes. Return original dst pointer and exit. */
ld 3,-16(1)
blr
.align 4
L(dus_tail16p4): /* less than 4 bytes left. */
addi 12,12,24
addi 3,3,24
bgt cr0,L(dus_tail2)
/* exactly 24 bytes. Return original dst pointer and exit. */
ld 3,-16(1)
blr
.align 4
L(dus_tail16p2): /* 16 bytes moved, less than 4 bytes left. */
addi 12,12,16
addi 3,3,16
b L(dus_tail2)
.align 4
L(dus_tail8): /* Move 8 bytes. */
/* r6, r7 already loaded speculatively. */
cmpldi cr1,10,8
cmpldi cr0,10,12
bf 28,L(dus_tail4)
.align 2
stw 6,0(3)
stw 7,4(3)
/* Move 4 bytes more. */
bf 29,L(dus_tail8p4)
lwz 6,8(12)
stw 6,8(3)
addi 12,12,12
addi 3,3,12
bgt cr0,L(dus_tail2)
/* exactly 12 bytes. Return original dst pointer and exit. */
ld 3,-16(1)
blr
.align 4
L(dus_tail8p4): /* less than 4 bytes left. */
addi 12,12,8
addi 3,3,8
bgt cr1,L(dus_tail2)
/* exactly 8 bytes. Return original dst pointer and exit. */
ld 3,-16(1)
blr
.align 4
L(dus_tail4): /* Move 4 bytes. */
/* r6 already loaded speculatively. If we are here we know there is
more than 4 bytes left. So there is no need to test. */
addi 12,12,4
stw 6,0(3)
addi 3,3,4
L(dus_tail2): /* Move 2-3 bytes. */
bf 30,L(dus_tail1)
lhz 6,0(12)
sth 6,0(3)
bf 31,L(dus_tailX)
lbz 7,2(12)
stb 7,2(3)
ld 3,-16(1)
blr
L(dus_tail1): /* Move 1 byte. */
bf 31,L(dus_tailX)
lbz 6,0(12)
stb 6,0(3)
L(dus_tailX):
/* Return original dst pointer. */
ld 3,-16(1)
blr
/* Special case to copy 0-8 bytes. */
.align 4
.LE8:
mr 12,4
bne cr6,L(dus_4)
/* Exactly 8 bytes. We may cross a 32-/128-byte boundary and take a ~20
cycle delay. This case should be rare and any attempt to avoid this
would take most of 20 cycles any way. */
ld 6,0(4)
std 6,0(3)
/* Return original dst pointer. */
ld 3,-16(1)
blr
.align 4
L(dus_4):
bf 29,L(dus_tail2)
lwz 6,0(4)
stw 6,0(3)
bf 30,L(dus_5)
lhz 7,4(4)
sth 7,4(3)
bf 31,L(dus_0)
lbz 8,6(4)
stb 8,6(3)
ld 3,-16(1)
blr
.align 4
L(dus_5):
bf 31,L(dus_0)
lbz 6,4(4)
stb 6,4(3)
L(dus_0):
/* Return original dst pointer. */
ld 3,-16(1)
blr
.align 4
.L6:
cfi_offset(31,-8)
mr 12,4
mr 31,5
/* Copy doublewords where the destination is aligned but the source is
not. Use aligned doubleword loads from the source, shifted to realign
the data, to allow aligned destination stores. */
addi 11,9,-1 /* loop DW count is one less than total */
subf 5,10,12 /* Move source addr to previous full double word. */
cmpldi cr5, 10, 2
cmpldi cr0, 10, 4
mr 4,3
srdi 8,11,2 /* calculate the 32 byte loop count */
ld 6,0(5) /* pre load 1st full doubleword. */
mtcrf 0x01,11
cmpldi cr6,9,4
mtctr 8
ld 7,8(5) /* pre load 2nd full doubleword. */
bge cr0, L(du4_do)
blt cr5, L(du1_do)
beq cr5, L(du2_do)
b L(du3_do)
.align 4
L(du1_do):
bf 30,L(du1_1dw)
/* there are at least two DWs to copy */
/* FIXME: can combine last shift and "or" into "rldimi" */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 8
sldi 8,7, 64-8
#else
sldi 0,6, 8
srdi 8,7, 64-8
#endif
or 0,0,8
ld 6,16(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 8
sldi 8,6, 64-8
#else
sldi 0,7, 8
srdi 8,6, 64-8
#endif
or 0,0,8
ld 7,24(5)
std 0,8(4)
addi 4,4,16
addi 5,5,32
blt cr6,L(du1_fini) /* if total DWs = 3, then bypass loop */
bf 31,L(du1_loop)
/* there is a third DW to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 8
sldi 8,7, 64-8
#else
sldi 0,6, 8
srdi 8,7, 64-8
#endif
or 0,0,8
std 0,0(4)
mr 6,7
ld 7,0(5)
addi 5,5,8
addi 4,4,8
beq cr6,L(du1_fini) /* if total DWs = 4, then bypass loop */
b L(du1_loop)
.align 4
L(du1_1dw):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 8
sldi 8,7, 64-8
#else
sldi 0,6, 8
srdi 8,7, 64-8
#endif
addi 5,5,16
or 0,0,8
bf 31,L(du1_loop)
mr 6,7
ld 7,0(5)
addi 5,5,8
std 0,0(4)
addi 4,4,8
.align 4
/* copy 32 bytes at a time */
L(du1_loop):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 8
sldi 8,7, 64-8
#else
sldi 0,6, 8
srdi 8,7, 64-8
#endif
or 0,0,8
ld 6,0(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 8
sldi 8,6, 64-8
#else
sldi 0,7, 8
srdi 8,6, 64-8
#endif
or 0,0,8
ld 7,8(5)
std 0,8(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 8
sldi 8,7, 64-8
#else
sldi 0,6, 8
srdi 8,7, 64-8
#endif
or 0,0,8
ld 6,16(5)
std 0,16(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 8
sldi 8,6, 64-8
#else
sldi 0,7, 8
srdi 8,6, 64-8
#endif
or 0,0,8
ld 7,24(5)
std 0,24(4)
addi 5,5,32
addi 4,4,32
bdnz+ L(du1_loop)
.align 4
L(du1_fini):
/* calculate and store the final DW */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 8
sldi 8,7, 64-8
#else
sldi 0,6, 8
srdi 8,7, 64-8
#endif
or 0,0,8
std 0,0(4)
b L(du_done)
.align 4
L(du2_do):
bf 30,L(du2_1dw)
/* there are at least two DWs to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 16
sldi 8,7, 64-16
#else
sldi 0,6, 16
srdi 8,7, 64-16
#endif
or 0,0,8
ld 6,16(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 16
sldi 8,6, 64-16
#else
sldi 0,7, 16
srdi 8,6, 64-16
#endif
or 0,0,8
ld 7,24(5)
std 0,8(4)
addi 4,4,16
addi 5,5,32
blt cr6,L(du2_fini) /* if total DWs = 3, then bypass loop */
bf 31,L(du2_loop)
/* there is a third DW to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 16
sldi 8,7, 64-16
#else
sldi 0,6, 16
srdi 8,7, 64-16
#endif
or 0,0,8
std 0,0(4)
mr 6,7
ld 7,0(5)
addi 5,5,8
addi 4,4,8
beq cr6,L(du2_fini) /* if total DWs = 4, then bypass loop */
b L(du2_loop)
.align 4
L(du2_1dw):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 16
sldi 8,7, 64-16
#else
sldi 0,6, 16
srdi 8,7, 64-16
#endif
addi 5,5,16
or 0,0,8
bf 31,L(du2_loop)
mr 6,7
ld 7,0(5)
addi 5,5,8
std 0,0(4)
addi 4,4,8
.align 4
/* copy 32 bytes at a time */
L(du2_loop):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 16
sldi 8,7, 64-16
#else
sldi 0,6, 16
srdi 8,7, 64-16
#endif
or 0,0,8
ld 6,0(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 16
sldi 8,6, 64-16
#else
sldi 0,7, 16
srdi 8,6, 64-16
#endif
or 0,0,8
ld 7,8(5)
std 0,8(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 16
sldi 8,7, 64-16
#else
sldi 0,6, 16
srdi 8,7, 64-16
#endif
or 0,0,8
ld 6,16(5)
std 0,16(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 16
sldi 8,6, 64-16
#else
sldi 0,7, 16
srdi 8,6, 64-16
#endif
or 0,0,8
ld 7,24(5)
std 0,24(4)
addi 5,5,32
addi 4,4,32
bdnz+ L(du2_loop)
.align 4
L(du2_fini):
/* calculate and store the final DW */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 16
sldi 8,7, 64-16
#else
sldi 0,6, 16
srdi 8,7, 64-16
#endif
or 0,0,8
std 0,0(4)
b L(du_done)
.align 4
L(du3_do):
bf 30,L(du3_1dw)
/* there are at least two DWs to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 24
sldi 8,7, 64-24
#else
sldi 0,6, 24
srdi 8,7, 64-24
#endif
or 0,0,8
ld 6,16(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 24
sldi 8,6, 64-24
#else
sldi 0,7, 24
srdi 8,6, 64-24
#endif
or 0,0,8
ld 7,24(5)
std 0,8(4)
addi 4,4,16
addi 5,5,32
blt cr6,L(du3_fini) /* if total DWs = 3, then bypass loop */
bf 31,L(du3_loop)
/* there is a third DW to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 24
sldi 8,7, 64-24
#else
sldi 0,6, 24
srdi 8,7, 64-24
#endif
or 0,0,8
std 0,0(4)
mr 6,7
ld 7,0(5)
addi 5,5,8
addi 4,4,8
beq cr6,L(du3_fini) /* if total DWs = 4, then bypass loop */
b L(du3_loop)
.align 4
L(du3_1dw):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 24
sldi 8,7, 64-24
#else
sldi 0,6, 24
srdi 8,7, 64-24
#endif
addi 5,5,16
or 0,0,8
bf 31,L(du3_loop)
mr 6,7
ld 7,0(5)
addi 5,5,8
std 0,0(4)
addi 4,4,8
.align 4
/* copy 32 bytes at a time */
L(du3_loop):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 24
sldi 8,7, 64-24
#else
sldi 0,6, 24
srdi 8,7, 64-24
#endif
or 0,0,8
ld 6,0(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 24
sldi 8,6, 64-24
#else
sldi 0,7, 24
srdi 8,6, 64-24
#endif
or 0,0,8
ld 7,8(5)
std 0,8(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 24
sldi 8,7, 64-24
#else
sldi 0,6, 24
srdi 8,7, 64-24
#endif
or 0,0,8
ld 6,16(5)
std 0,16(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 24
sldi 8,6, 64-24
#else
sldi 0,7, 24
srdi 8,6, 64-24
#endif
or 0,0,8
ld 7,24(5)
std 0,24(4)
addi 5,5,32
addi 4,4,32
bdnz+ L(du3_loop)
.align 4
L(du3_fini):
/* calculate and store the final DW */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 24
sldi 8,7, 64-24
#else
sldi 0,6, 24
srdi 8,7, 64-24
#endif
or 0,0,8
std 0,0(4)
b L(du_done)
.align 4
L(du4_do):
cmpldi cr5, 10, 6
beq cr0, L(du4_dox)
blt cr5, L(du5_do)
beq cr5, L(du6_do)
b L(du7_do)
L(du4_dox):
bf 30,L(du4_1dw)
/* there are at least two DWs to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 32
sldi 8,7, 64-32
#else
sldi 0,6, 32
srdi 8,7, 64-32
#endif
or 0,0,8
ld 6,16(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 32
sldi 8,6, 64-32
#else
sldi 0,7, 32
srdi 8,6, 64-32
#endif
or 0,0,8
ld 7,24(5)
std 0,8(4)
addi 4,4,16
addi 5,5,32
blt cr6,L(du4_fini) /* if total DWs = 3, then bypass loop */
bf 31,L(du4_loop)
/* there is a third DW to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 32
sldi 8,7, 64-32
#else
sldi 0,6, 32
srdi 8,7, 64-32
#endif
or 0,0,8
std 0,0(4)
mr 6,7
ld 7,0(5)
addi 5,5,8
addi 4,4,8
beq cr6,L(du4_fini) /* if total DWs = 4, then bypass loop */
b L(du4_loop)
.align 4
L(du4_1dw):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 32
sldi 8,7, 64-32
#else
sldi 0,6, 32
srdi 8,7, 64-32
#endif
addi 5,5,16
or 0,0,8
bf 31,L(du4_loop)
mr 6,7
ld 7,0(5)
addi 5,5,8
std 0,0(4)
addi 4,4,8
.align 4
/* copy 32 bytes at a time */
L(du4_loop):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 32
sldi 8,7, 64-32
#else
sldi 0,6, 32
srdi 8,7, 64-32
#endif
or 0,0,8
ld 6,0(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 32
sldi 8,6, 64-32
#else
sldi 0,7, 32
srdi 8,6, 64-32
#endif
or 0,0,8
ld 7,8(5)
std 0,8(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 32
sldi 8,7, 64-32
#else
sldi 0,6, 32
srdi 8,7, 64-32
#endif
or 0,0,8
ld 6,16(5)
std 0,16(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 32
sldi 8,6, 64-32
#else
sldi 0,7, 32
srdi 8,6, 64-32
#endif
or 0,0,8
ld 7,24(5)
std 0,24(4)
addi 5,5,32
addi 4,4,32
bdnz+ L(du4_loop)
.align 4
L(du4_fini):
/* calculate and store the final DW */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 32
sldi 8,7, 64-32
#else
sldi 0,6, 32
srdi 8,7, 64-32
#endif
or 0,0,8
std 0,0(4)
b L(du_done)
.align 4
L(du5_do):
bf 30,L(du5_1dw)
/* there are at least two DWs to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 40
sldi 8,7, 64-40
#else
sldi 0,6, 40
srdi 8,7, 64-40
#endif
or 0,0,8
ld 6,16(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 40
sldi 8,6, 64-40
#else
sldi 0,7, 40
srdi 8,6, 64-40
#endif
or 0,0,8
ld 7,24(5)
std 0,8(4)
addi 4,4,16
addi 5,5,32
blt cr6,L(du5_fini) /* if total DWs = 3, then bypass loop */
bf 31,L(du5_loop)
/* there is a third DW to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 40
sldi 8,7, 64-40
#else
sldi 0,6, 40
srdi 8,7, 64-40
#endif
or 0,0,8
std 0,0(4)
mr 6,7
ld 7,0(5)
addi 5,5,8
addi 4,4,8
beq cr6,L(du5_fini) /* if total DWs = 4, then bypass loop */
b L(du5_loop)
.align 4
L(du5_1dw):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 40
sldi 8,7, 64-40
#else
sldi 0,6, 40
srdi 8,7, 64-40
#endif
addi 5,5,16
or 0,0,8
bf 31,L(du5_loop)
mr 6,7
ld 7,0(5)
addi 5,5,8
std 0,0(4)
addi 4,4,8
.align 4
/* copy 32 bytes at a time */
L(du5_loop):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 40
sldi 8,7, 64-40
#else
sldi 0,6, 40
srdi 8,7, 64-40
#endif
or 0,0,8
ld 6,0(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 40
sldi 8,6, 64-40
#else
sldi 0,7, 40
srdi 8,6, 64-40
#endif
or 0,0,8
ld 7,8(5)
std 0,8(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 40
sldi 8,7, 64-40
#else
sldi 0,6, 40
srdi 8,7, 64-40
#endif
or 0,0,8
ld 6,16(5)
std 0,16(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 40
sldi 8,6, 64-40
#else
sldi 0,7, 40
srdi 8,6, 64-40
#endif
or 0,0,8
ld 7,24(5)
std 0,24(4)
addi 5,5,32
addi 4,4,32
bdnz+ L(du5_loop)
.align 4
L(du5_fini):
/* calculate and store the final DW */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 40
sldi 8,7, 64-40
#else
sldi 0,6, 40
srdi 8,7, 64-40
#endif
or 0,0,8
std 0,0(4)
b L(du_done)
.align 4
L(du6_do):
bf 30,L(du6_1dw)
/* there are at least two DWs to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 48
sldi 8,7, 64-48
#else
sldi 0,6, 48
srdi 8,7, 64-48
#endif
or 0,0,8
ld 6,16(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 48
sldi 8,6, 64-48
#else
sldi 0,7, 48
srdi 8,6, 64-48
#endif
or 0,0,8
ld 7,24(5)
std 0,8(4)
addi 4,4,16
addi 5,5,32
blt cr6,L(du6_fini) /* if total DWs = 3, then bypass loop */
bf 31,L(du6_loop)
/* there is a third DW to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 48
sldi 8,7, 64-48
#else
sldi 0,6, 48
srdi 8,7, 64-48
#endif
or 0,0,8
std 0,0(4)
mr 6,7
ld 7,0(5)
addi 5,5,8
addi 4,4,8
beq cr6,L(du6_fini) /* if total DWs = 4, then bypass loop */
b L(du6_loop)
.align 4
L(du6_1dw):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 48
sldi 8,7, 64-48
#else
sldi 0,6, 48
srdi 8,7, 64-48
#endif
addi 5,5,16
or 0,0,8
bf 31,L(du6_loop)
mr 6,7
ld 7,0(5)
addi 5,5,8
std 0,0(4)
addi 4,4,8
.align 4
/* copy 32 bytes at a time */
L(du6_loop):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 48
sldi 8,7, 64-48
#else
sldi 0,6, 48
srdi 8,7, 64-48
#endif
or 0,0,8
ld 6,0(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 48
sldi 8,6, 64-48
#else
sldi 0,7, 48
srdi 8,6, 64-48
#endif
or 0,0,8
ld 7,8(5)
std 0,8(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 48
sldi 8,7, 64-48
#else
sldi 0,6, 48
srdi 8,7, 64-48
#endif
or 0,0,8
ld 6,16(5)
std 0,16(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 48
sldi 8,6, 64-48
#else
sldi 0,7, 48
srdi 8,6, 64-48
#endif
or 0,0,8
ld 7,24(5)
std 0,24(4)
addi 5,5,32
addi 4,4,32
bdnz+ L(du6_loop)
.align 4
L(du6_fini):
/* calculate and store the final DW */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 48
sldi 8,7, 64-48
#else
sldi 0,6, 48
srdi 8,7, 64-48
#endif
or 0,0,8
std 0,0(4)
b L(du_done)
.align 4
L(du7_do):
bf 30,L(du7_1dw)
/* there are at least two DWs to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 56
sldi 8,7, 64-56
#else
sldi 0,6, 56
srdi 8,7, 64-56
#endif
or 0,0,8
ld 6,16(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 56
sldi 8,6, 64-56
#else
sldi 0,7, 56
srdi 8,6, 64-56
#endif
or 0,0,8
ld 7,24(5)
std 0,8(4)
addi 4,4,16
addi 5,5,32
blt cr6,L(du7_fini) /* if total DWs = 3, then bypass loop */
bf 31,L(du7_loop)
/* there is a third DW to copy */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 56
sldi 8,7, 64-56
#else
sldi 0,6, 56
srdi 8,7, 64-56
#endif
or 0,0,8
std 0,0(4)
mr 6,7
ld 7,0(5)
addi 5,5,8
addi 4,4,8
beq cr6,L(du7_fini) /* if total DWs = 4, then bypass loop */
b L(du7_loop)
.align 4
L(du7_1dw):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 56
sldi 8,7, 64-56
#else
sldi 0,6, 56
srdi 8,7, 64-56
#endif
addi 5,5,16
or 0,0,8
bf 31,L(du7_loop)
mr 6,7
ld 7,0(5)
addi 5,5,8
std 0,0(4)
addi 4,4,8
.align 4
/* copy 32 bytes at a time */
L(du7_loop):
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 56
sldi 8,7, 64-56
#else
sldi 0,6, 56
srdi 8,7, 64-56
#endif
or 0,0,8
ld 6,0(5)
std 0,0(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 56
sldi 8,6, 64-56
#else
sldi 0,7, 56
srdi 8,6, 64-56
#endif
or 0,0,8
ld 7,8(5)
std 0,8(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 56
sldi 8,7, 64-56
#else
sldi 0,6, 56
srdi 8,7, 64-56
#endif
or 0,0,8
ld 6,16(5)
std 0,16(4)
#ifdef __LITTLE_ENDIAN__
srdi 0,7, 56
sldi 8,6, 64-56
#else
sldi 0,7, 56
srdi 8,6, 64-56
#endif
or 0,0,8
ld 7,24(5)
std 0,24(4)
addi 5,5,32
addi 4,4,32
bdnz+ L(du7_loop)
.align 4
L(du7_fini):
/* calculate and store the final DW */
#ifdef __LITTLE_ENDIAN__
srdi 0,6, 56
sldi 8,7, 64-56
#else
sldi 0,6, 56
srdi 8,7, 64-56
#endif
or 0,0,8
std 0,0(4)
b L(du_done)
.align 4
L(du_done):
rldicr 0,31,0,60
mtcrf 0x01,31
beq cr1,0f /* If the tail is 0 bytes we are done! */
add 3,3,0
add 12,12,0
/* At this point we have a tail of 0-7 bytes and we know that the
destination is double word aligned. */
4: bf 29,2f
lwz 6,0(12)
addi 12,12,4
stw 6,0(3)
addi 3,3,4
2: bf 30,1f
lhz 6,0(12)
addi 12,12,2
sth 6,0(3)
addi 3,3,2
1: bf 31,0f
lbz 6,0(12)
stb 6,0(3)
0:
/* Return original dst pointer. */
ld 31,-8(1)
ld 3,-16(1)
blr
END_GEN_TB (MEMCPY,TB_TOCLESS)
libc_hidden_builtin_def (memcpy)
Reference in New Issue View Git Blame Copy Permalink