230 lines
5.9 KiB
ArmAsm
230 lines
5.9 KiB
ArmAsm
/* Optimized memset implementation for PowerPC.
|
|
Copyright (C) 1997, 1999, 2000 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <sysdep.h>
|
|
#include <bp-sym.h>
|
|
#include <bp-asm.h>
|
|
|
|
/* __ptr_t [r3] memset (__ptr_t s [r3], int c [r4], size_t n [r5]));
|
|
Returns 's'.
|
|
|
|
The memset is done in three sizes: byte (8 bits), word (32 bits),
|
|
cache line (256 bits). There is a special case for setting cache lines
|
|
to 0, to take advantage of the dcbz instruction. */
|
|
|
|
EALIGN (BP_SYM (memset), 5, 1)
|
|
|
|
#define rTMP r0
|
|
#define rRTN r3 /* initial value of 1st argument */
|
|
#if __BOUNDED_POINTERS__
|
|
# define rMEMP0 r4 /* original value of 1st arg */
|
|
# define rCHR r5 /* char to set in each byte */
|
|
# define rLEN r6 /* length of region to set */
|
|
# define rMEMP r10 /* address at which we are storing */
|
|
#else
|
|
# define rMEMP0 r3 /* original value of 1st arg */
|
|
# define rCHR r4 /* char to set in each byte */
|
|
# define rLEN r5 /* length of region to set */
|
|
# define rMEMP r6 /* address at which we are storing */
|
|
#endif
|
|
#define rALIGN r7 /* number of bytes we are setting now (when aligning) */
|
|
#define rMEMP2 r8
|
|
|
|
#define rPOS32 r7 /* constant +32 for clearing with dcbz */
|
|
#define rNEG64 r8 /* constant -64 for clearing with dcbz */
|
|
#define rNEG32 r9 /* constant -32 for clearing with dcbz */
|
|
|
|
#if __BOUNDED_POINTERS__
|
|
cmplwi cr1, rRTN, 0
|
|
CHECK_BOUNDS_BOTH_WIDE (rMEMP0, rTMP, rTMP2, rLEN)
|
|
beq cr1, L(b0)
|
|
STORE_RETURN_VALUE (rMEMP0)
|
|
STORE_RETURN_BOUNDS (rTMP, rTMP2)
|
|
L(b0):
|
|
#endif
|
|
|
|
/* take care of case for size <= 4 */
|
|
cmplwi cr1, rLEN, 4
|
|
andi. rALIGN, rMEMP0, 3
|
|
mr rMEMP, rMEMP0
|
|
ble- cr1, L(small)
|
|
/* align to word boundary */
|
|
cmplwi cr5, rLEN, 31
|
|
rlwimi rCHR, rCHR, 8, 16, 23
|
|
beq+ L(aligned) /* 8th instruction from .align */
|
|
mtcrf 0x01, rMEMP0
|
|
subfic rALIGN, rALIGN, 4
|
|
add rMEMP, rMEMP, rALIGN
|
|
sub rLEN, rLEN, rALIGN
|
|
bf+ 31, L(g0)
|
|
stb rCHR, 0(rMEMP0)
|
|
bt 30, L(aligned)
|
|
L(g0): sth rCHR, -2(rMEMP) /* 16th instruction from .align */
|
|
/* take care of case for size < 31 */
|
|
L(aligned):
|
|
mtcrf 0x01, rLEN
|
|
rlwimi rCHR, rCHR, 16, 0, 15
|
|
ble cr5, L(medium)
|
|
/* align to cache line boundary... */
|
|
andi. rALIGN, rMEMP, 0x1C
|
|
subfic rALIGN, rALIGN, 0x20
|
|
beq L(caligned)
|
|
mtcrf 0x01, rALIGN
|
|
add rMEMP, rMEMP, rALIGN
|
|
sub rLEN, rLEN, rALIGN
|
|
cmplwi cr1, rALIGN, 0x10
|
|
mr rMEMP2, rMEMP
|
|
bf 28, L(a1)
|
|
stw rCHR, -4(rMEMP2)
|
|
stwu rCHR, -8(rMEMP2)
|
|
L(a1): blt cr1, L(a2)
|
|
stw rCHR, -4(rMEMP2) /* 32nd instruction from .align */
|
|
stw rCHR, -8(rMEMP2)
|
|
stw rCHR, -12(rMEMP2)
|
|
stwu rCHR, -16(rMEMP2)
|
|
L(a2): bf 29, L(caligned)
|
|
stw rCHR, -4(rMEMP2)
|
|
/* now aligned to a cache line. */
|
|
L(caligned):
|
|
cmplwi cr1, rCHR, 0
|
|
clrrwi. rALIGN, rLEN, 5
|
|
mtcrf 0x01, rLEN /* 40th instruction from .align */
|
|
beq cr1, L(zloopstart) /* special case for clearing memory using dcbz */
|
|
srwi rTMP, rALIGN, 5
|
|
mtctr rTMP
|
|
beq L(medium) /* we may not actually get to do a full line */
|
|
clrlwi. rLEN, rLEN, 27
|
|
add rMEMP, rMEMP, rALIGN
|
|
li rNEG64, -0x40
|
|
bdz L(cloopdone) /* 48th instruction from .align */
|
|
|
|
L(c3): dcbz rNEG64, rMEMP
|
|
stw rCHR, -4(rMEMP)
|
|
stw rCHR, -8(rMEMP)
|
|
stw rCHR, -12(rMEMP)
|
|
stw rCHR, -16(rMEMP)
|
|
nop /* let 601 fetch last 4 instructions of loop */
|
|
stw rCHR, -20(rMEMP)
|
|
stw rCHR, -24(rMEMP) /* 56th instruction from .align */
|
|
nop /* let 601 fetch first 8 instructions of loop */
|
|
stw rCHR, -28(rMEMP)
|
|
stwu rCHR, -32(rMEMP)
|
|
bdnz L(c3)
|
|
L(cloopdone):
|
|
stw rCHR, -4(rMEMP)
|
|
stw rCHR, -8(rMEMP)
|
|
stw rCHR, -12(rMEMP)
|
|
stw rCHR, -16(rMEMP) /* 64th instruction from .align */
|
|
stw rCHR, -20(rMEMP)
|
|
cmplwi cr1, rLEN, 16
|
|
stw rCHR, -24(rMEMP)
|
|
stw rCHR, -28(rMEMP)
|
|
stwu rCHR, -32(rMEMP)
|
|
beqlr
|
|
add rMEMP, rMEMP, rALIGN
|
|
b L(medium_tail2) /* 72nd instruction from .align */
|
|
|
|
.align 5
|
|
nop
|
|
/* Clear lines of memory in 128-byte chunks. */
|
|
L(zloopstart):
|
|
clrlwi rLEN, rLEN, 27
|
|
mtcrf 0x02, rALIGN
|
|
srwi. rTMP, rALIGN, 7
|
|
mtctr rTMP
|
|
li rPOS32, 0x20
|
|
li rNEG64, -0x40
|
|
cmplwi cr1, rLEN, 16 /* 8 */
|
|
bf 26, L(z0)
|
|
dcbz 0, rMEMP
|
|
addi rMEMP, rMEMP, 0x20
|
|
L(z0): li rNEG32, -0x20
|
|
bf 25, L(z1)
|
|
dcbz 0, rMEMP
|
|
dcbz rPOS32, rMEMP
|
|
addi rMEMP, rMEMP, 0x40 /* 16 */
|
|
L(z1): cmplwi cr5, rLEN, 0
|
|
beq L(medium)
|
|
L(zloop):
|
|
dcbz 0, rMEMP
|
|
dcbz rPOS32, rMEMP
|
|
addi rMEMP, rMEMP, 0x80
|
|
dcbz rNEG64, rMEMP
|
|
dcbz rNEG32, rMEMP
|
|
bdnz L(zloop)
|
|
beqlr cr5
|
|
b L(medium_tail2)
|
|
|
|
.align 5
|
|
L(small):
|
|
/* Memset of 4 bytes or less. */
|
|
cmplwi cr5, rLEN, 1
|
|
cmplwi cr1, rLEN, 3
|
|
bltlr cr5
|
|
stb rCHR, 0(rMEMP)
|
|
beqlr cr5
|
|
nop
|
|
stb rCHR, 1(rMEMP)
|
|
bltlr cr1
|
|
stb rCHR, 2(rMEMP)
|
|
beqlr cr1
|
|
nop
|
|
stb rCHR, 3(rMEMP)
|
|
blr
|
|
|
|
/* Memset of 0-31 bytes. */
|
|
.align 5
|
|
L(medium):
|
|
cmplwi cr1, rLEN, 16
|
|
L(medium_tail2):
|
|
add rMEMP, rMEMP, rLEN
|
|
L(medium_tail):
|
|
bt- 31, L(medium_31t)
|
|
bt- 30, L(medium_30t)
|
|
L(medium_30f):
|
|
bt- 29, L(medium_29t)
|
|
L(medium_29f):
|
|
bge- cr1, L(medium_27t)
|
|
bflr- 28
|
|
stw rCHR, -4(rMEMP) /* 8th instruction from .align */
|
|
stw rCHR, -8(rMEMP)
|
|
blr
|
|
|
|
L(medium_31t):
|
|
stbu rCHR, -1(rMEMP)
|
|
bf- 30, L(medium_30f)
|
|
L(medium_30t):
|
|
sthu rCHR, -2(rMEMP)
|
|
bf- 29, L(medium_29f)
|
|
L(medium_29t):
|
|
stwu rCHR, -4(rMEMP)
|
|
blt- cr1, L(medium_27f) /* 16th instruction from .align */
|
|
L(medium_27t):
|
|
stw rCHR, -4(rMEMP)
|
|
stw rCHR, -8(rMEMP)
|
|
stw rCHR, -12(rMEMP)
|
|
stwu rCHR, -16(rMEMP)
|
|
L(medium_27f):
|
|
bflr- 28
|
|
L(medium_28t):
|
|
stw rCHR, -4(rMEMP)
|
|
stw rCHR, -8(rMEMP)
|
|
blr
|
|
END (BP_SYM (memset))
|