mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 12:11:10 +00:00
d59e49d894
* sysdeps/powerpc/gprrest0.S: Use ASM_GLOBAL_DIRECTIVE instead of .globl. * sysdeps/powerpc/gprsave0.S: Likewise. * sysdeps/powerpc/gprrest1.S: Likewise. * sysdeps/powerpc/gprsave1.S: Likewise.
200 lines
4.6 KiB
ArmAsm
200 lines
4.6 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>
|
|
|
|
EALIGN(memset,5,1)
|
|
/* __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.
|
|
r6: current address we are storing at
|
|
r7: number of bytes we are setting now (when aligning) */
|
|
|
|
/* take care of case for size <= 4 */
|
|
cmplwi cr1,r5,4
|
|
andi. r7,r3,3
|
|
mr r6,r3
|
|
ble- cr1,L(small)
|
|
/* align to word boundary */
|
|
cmplwi cr5,r5,31
|
|
rlwimi r4,r4,8,16,23
|
|
beq+ L(aligned) # 8th instruction from .align
|
|
mtcrf 0x01,r3
|
|
subfic r7,r7,4
|
|
add r6,r6,r7
|
|
sub r5,r5,r7
|
|
bf+ 31,L(g0)
|
|
stb r4,0(r3)
|
|
bt 30,L(aligned)
|
|
L(g0): sth r4,-2(r6) # 16th instruction from .align
|
|
/* take care of case for size < 31 */
|
|
L(aligned):
|
|
mtcrf 0x01,r5
|
|
rlwimi r4,r4,16,0,15
|
|
ble cr5,L(medium)
|
|
/* align to cache line boundary... */
|
|
andi. r7,r6,0x1C
|
|
subfic r7,r7,0x20
|
|
beq L(caligned)
|
|
mtcrf 0x01,r7
|
|
add r6,r6,r7
|
|
sub r5,r5,r7
|
|
cmplwi cr1,r7,0x10
|
|
mr r8,r6
|
|
bf 28,L(a1)
|
|
stw r4,-4(r8)
|
|
stwu r4,-8(r8)
|
|
L(a1): blt cr1,L(a2)
|
|
stw r4,-4(r8) # 32nd instruction from .align
|
|
stw r4,-8(r8)
|
|
stw r4,-12(r8)
|
|
stwu r4,-16(r8)
|
|
L(a2): bf 29,L(caligned)
|
|
stw r4,-4(r8)
|
|
/* now aligned to a cache line. */
|
|
L(caligned):
|
|
cmplwi cr1,r4,0
|
|
clrrwi. r7,r5,5
|
|
mtcrf 0x01,r5 # 40th instruction from .align
|
|
beq cr1,L(zloopstart) # special case for clearing memory using dcbz
|
|
srwi r0,r7,5
|
|
mtctr r0
|
|
beq L(medium) # we may not actually get to do a full line
|
|
clrlwi. r5,r5,27
|
|
add r6,r6,r7
|
|
li r8,-0x40
|
|
bdz L(cloopdone) # 48th instruction from .align
|
|
|
|
L(c3): dcbz r8,r6
|
|
stw r4,-4(r6)
|
|
stw r4,-8(r6)
|
|
stw r4,-12(r6)
|
|
stw r4,-16(r6)
|
|
nop # let 601 fetch last 4 instructions of loop
|
|
stw r4,-20(r6)
|
|
stw r4,-24(r6) # 56th instruction from .align
|
|
nop # let 601 fetch first 8 instructions of loop
|
|
stw r4,-28(r6)
|
|
stwu r4,-32(r6)
|
|
bdnz L(c3)
|
|
L(cloopdone):
|
|
stw r4,-4(r6)
|
|
stw r4,-8(r6)
|
|
stw r4,-12(r6)
|
|
stw r4,-16(r6) # 64th instruction from .align
|
|
stw r4,-20(r6)
|
|
cmplwi cr1,r5,16
|
|
stw r4,-24(r6)
|
|
stw r4,-28(r6)
|
|
stwu r4,-32(r6)
|
|
beqlr
|
|
add r6,r6,r7
|
|
b L(medium_tail2) # 72nd instruction from .align
|
|
|
|
.align 5
|
|
nop
|
|
/* Clear lines of memory in 128-byte chunks. */
|
|
L(zloopstart):
|
|
clrlwi r5,r5,27
|
|
mtcrf 0x02,r7
|
|
srwi. r0,r7,7
|
|
mtctr r0
|
|
li r7,0x20
|
|
li r8,-0x40
|
|
cmplwi cr1,r5,16 # 8
|
|
bf 26,L(z0)
|
|
dcbz 0,r6
|
|
addi r6,r6,0x20
|
|
L(z0): li r9,-0x20
|
|
bf 25,L(z1)
|
|
dcbz 0,r6
|
|
dcbz r7,r6
|
|
addi r6,r6,0x40 # 16
|
|
L(z1): cmplwi cr5,r5,0
|
|
beq L(medium)
|
|
L(zloop):
|
|
dcbz 0,r6
|
|
dcbz r7,r6
|
|
addi r6,r6,0x80
|
|
dcbz r8,r6
|
|
dcbz r9,r6
|
|
bdnz L(zloop)
|
|
beqlr cr5
|
|
b L(medium_tail2)
|
|
|
|
.align 5
|
|
L(small):
|
|
/* Memset of 4 bytes or less. */
|
|
cmplwi cr5,r5,1
|
|
cmplwi cr1,r5,3
|
|
bltlr cr5
|
|
stb r4,0(r6)
|
|
beqlr cr5
|
|
nop
|
|
stb r4,1(r6)
|
|
bltlr cr1
|
|
stb r4,2(r6)
|
|
beqlr cr1
|
|
nop
|
|
stb r4,3(r6)
|
|
blr
|
|
|
|
/* Memset of 0-31 bytes. */
|
|
.align 5
|
|
L(medium):
|
|
cmplwi cr1,r5,16
|
|
L(medium_tail2):
|
|
add r6,r6,r5
|
|
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 r4,-4(r6) # 8th instruction from .align
|
|
stw r4,-8(r6)
|
|
blr
|
|
|
|
L(medium_31t):
|
|
stbu r4,-1(r6)
|
|
bf- 30,L(medium_30f)
|
|
L(medium_30t):
|
|
sthu r4,-2(r6)
|
|
bf- 29,L(medium_29f)
|
|
L(medium_29t):
|
|
stwu r4,-4(r6)
|
|
blt- cr1,L(medium_27f) # 16th instruction from .align
|
|
L(medium_27t):
|
|
stw r4,-4(r6)
|
|
stw r4,-8(r6)
|
|
stw r4,-12(r6)
|
|
stwu r4,-16(r6)
|
|
L(medium_27f):
|
|
bflr- 28
|
|
L(medium_28t):
|
|
stw r4,-4(r6)
|
|
stw r4,-8(r6)
|
|
blr
|
|
END(memset)
|