mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
266 lines
6.5 KiB
ArmAsm
266 lines
6.5 KiB
ArmAsm
/* Optimized memset implementation for PowerPC64.
|
|
Copyright (C) 1997-2018 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
.section ".toc","aw"
|
|
.LC0:
|
|
.tc __cache_line_size[TC],__cache_line_size
|
|
.section ".text"
|
|
.align 2
|
|
|
|
/* void * [r3] memset (void *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. */
|
|
|
|
#ifndef MEMSET
|
|
# define MEMSET memset
|
|
#endif
|
|
|
|
ENTRY (MEMSET, 5)
|
|
CALL_MCOUNT 3
|
|
|
|
#define rTMP r0
|
|
#define rRTN r3 /* Initial value of 1st argument. */
|
|
#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. */
|
|
#define rALIGN r7 /* Number of bytes we are setting now (when aligning). */
|
|
#define rMEMP2 r8
|
|
|
|
#define rNEG64 r8 /* Constant -64 for clearing with dcbz. */
|
|
#define rCLS r8 /* Cache line size obtained from static. */
|
|
#define rCLM r9 /* Cache line size mask to check for cache alignment. */
|
|
L(_memset):
|
|
/* Take care of case for size <= 4. */
|
|
cmpldi cr1, rLEN, 8
|
|
andi. rALIGN, rMEMP0, 7
|
|
mr rMEMP, rMEMP0
|
|
ble- cr1, L(small)
|
|
|
|
/* Align to doubleword boundary. */
|
|
cmpldi cr5, rLEN, 31
|
|
insrdi rCHR, rCHR, 8, 48 /* Replicate byte to halfword. */
|
|
beq+ L(aligned2)
|
|
mtcrf 0x01, rMEMP0
|
|
subfic rALIGN, rALIGN, 8
|
|
cror 28,30,31 /* Detect odd word aligned. */
|
|
add rMEMP, rMEMP, rALIGN
|
|
sub rLEN, rLEN, rALIGN
|
|
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
|
|
bt 29, L(g4)
|
|
/* Process the even word of doubleword. */
|
|
bf+ 31, L(g2)
|
|
stb rCHR, 0(rMEMP0)
|
|
bt 30, L(g4x)
|
|
L(g2):
|
|
sth rCHR, -6(rMEMP)
|
|
L(g4x):
|
|
stw rCHR, -4(rMEMP)
|
|
b L(aligned)
|
|
/* Process the odd word of doubleword. */
|
|
L(g4):
|
|
bf 28, L(g4x) /* If false, word aligned on odd word. */
|
|
bf+ 31, L(g0)
|
|
stb rCHR, 0(rMEMP0)
|
|
bt 30, L(aligned)
|
|
L(g0):
|
|
sth rCHR, -2(rMEMP)
|
|
|
|
/* Handle the case of size < 31. */
|
|
L(aligned2):
|
|
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
|
|
L(aligned):
|
|
mtcrf 0x01, rLEN
|
|
ble cr5, L(medium)
|
|
/* Align to 32-byte boundary. */
|
|
andi. rALIGN, rMEMP, 0x18
|
|
subfic rALIGN, rALIGN, 0x20
|
|
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
|
|
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)
|
|
stdu rCHR, -8(rMEMP2)
|
|
L(a1): blt cr1, L(a2)
|
|
std rCHR, -8(rMEMP2)
|
|
stdu rCHR, -16(rMEMP2)
|
|
L(a2):
|
|
|
|
/* Now aligned to a 32 byte boundary. */
|
|
L(caligned):
|
|
cmpldi cr1, rCHR, 0
|
|
clrrdi. rALIGN, rLEN, 5
|
|
mtcrf 0x01, rLEN
|
|
beq cr1, L(zloopstart) /* Special case for clearing memory using dcbz. */
|
|
L(nondcbz):
|
|
srdi rTMP, rALIGN, 5
|
|
mtctr rTMP
|
|
beq L(medium) /* We may not actually get to do a full line. */
|
|
clrldi. rLEN, rLEN, 59
|
|
add rMEMP, rMEMP, rALIGN
|
|
li rNEG64, -0x40
|
|
bdz L(cloopdone)
|
|
|
|
L(c3): dcbtst rNEG64, rMEMP
|
|
std rCHR, -8(rMEMP)
|
|
std rCHR, -16(rMEMP)
|
|
std rCHR, -24(rMEMP)
|
|
stdu rCHR, -32(rMEMP)
|
|
bdnz L(c3)
|
|
L(cloopdone):
|
|
std rCHR, -8(rMEMP)
|
|
std rCHR, -16(rMEMP)
|
|
cmpldi cr1, rLEN, 16
|
|
std rCHR, -24(rMEMP)
|
|
stdu rCHR, -32(rMEMP)
|
|
beqlr
|
|
add rMEMP, rMEMP, rALIGN
|
|
b L(medium_tail2)
|
|
|
|
.align 5
|
|
/* Clear lines of memory in 128-byte chunks. */
|
|
L(zloopstart):
|
|
/* If the remaining length is less the 32 bytes, don't bother getting
|
|
the cache line size. */
|
|
beq L(medium)
|
|
ld rCLS,.LC0@toc(r2)
|
|
lwz rCLS,0(rCLS)
|
|
/* If the cache line size was not set just goto to L(nondcbz) which is
|
|
safe for any cache line size. */
|
|
cmpldi cr1,rCLS,0
|
|
beq cr1,L(nondcbz)
|
|
|
|
|
|
/* Now we know the cache line size, and it is not 32-bytes, but
|
|
we may not yet be aligned to the cache line. May have a partial
|
|
line to fill, so touch it 1st. */
|
|
dcbt 0,rMEMP
|
|
addi rCLM,rCLS,-1
|
|
L(getCacheAligned):
|
|
cmpldi cr1,rLEN,32
|
|
and. rTMP,rCLM,rMEMP
|
|
blt cr1,L(handletail32)
|
|
beq L(cacheAligned)
|
|
addi rMEMP,rMEMP,32
|
|
addi rLEN,rLEN,-32
|
|
std rCHR,-32(rMEMP)
|
|
std rCHR,-24(rMEMP)
|
|
std rCHR,-16(rMEMP)
|
|
std rCHR,-8(rMEMP)
|
|
b L(getCacheAligned)
|
|
|
|
/* Now we are aligned to the cache line and can use dcbz. */
|
|
L(cacheAligned):
|
|
cmpld cr1,rLEN,rCLS
|
|
blt cr1,L(handletail32)
|
|
dcbz 0,rMEMP
|
|
subf rLEN,rCLS,rLEN
|
|
add rMEMP,rMEMP,rCLS
|
|
b L(cacheAligned)
|
|
|
|
/* We are here because the cache line size was set and was not 32-bytes
|
|
and the remainder (rLEN) is less than the actual cache line size.
|
|
So set up the preconditions for L(nondcbz) and go there. */
|
|
L(handletail32):
|
|
clrrwi. rALIGN, rLEN, 5
|
|
b L(nondcbz)
|
|
|
|
.align 5
|
|
L(small):
|
|
/* Memset of 8 bytes or less. */
|
|
cmpldi cr6, rLEN, 4
|
|
cmpldi cr5, rLEN, 1
|
|
ble cr6,L(le4)
|
|
subi rLEN, rLEN, 4
|
|
stb rCHR,0(rMEMP)
|
|
stb rCHR,1(rMEMP)
|
|
stb rCHR,2(rMEMP)
|
|
stb rCHR,3(rMEMP)
|
|
addi rMEMP,rMEMP, 4
|
|
cmpldi cr5, rLEN, 1
|
|
L(le4):
|
|
cmpldi cr1, rLEN, 3
|
|
bltlr cr5
|
|
stb rCHR, 0(rMEMP)
|
|
beqlr cr5
|
|
stb rCHR, 1(rMEMP)
|
|
bltlr cr1
|
|
stb rCHR, 2(rMEMP)
|
|
beqlr cr1
|
|
stb rCHR, 3(rMEMP)
|
|
blr
|
|
|
|
/* Memset of 0-31 bytes. */
|
|
.align 5
|
|
L(medium):
|
|
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
|
|
cmpldi 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
|
|
std 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)
|
|
L(medium_27t):
|
|
std rCHR, -8(rMEMP)
|
|
stdu rCHR, -16(rMEMP)
|
|
L(medium_27f):
|
|
bflr- 28
|
|
L(medium_28t):
|
|
std rCHR, -8(rMEMP)
|
|
blr
|
|
END_GEN_TB (MEMSET,TB_TOCLESS)
|
|
libc_hidden_builtin_def (memset)
|
|
|
|
#ifndef NO_BZERO_IMPL
|
|
/* Copied from bzero.S to prevent the linker from inserting a stub
|
|
between bzero and memset. */
|
|
ENTRY (__bzero)
|
|
CALL_MCOUNT 3
|
|
mr r5,r4
|
|
li r4,0
|
|
b L(_memset)
|
|
END_GEN_TB (__bzero,TB_TOCLESS)
|
|
|
|
weak_alias (__bzero, bzero)
|
|
#endif
|