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/* Copy SIZE bytes from SRC to DEST.
For UltraSPARC-III.
Copyright (C) 2001, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David S. Miller (davem@redhat.com)
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>
#define ASI_BLK_P 0xf0
#define FPRS_FEF 0x04
#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
#ifndef XCC
#define USE_BPR
#define XCC xcc
#endif
#if !defined NOT_IN_libc
.register %g2,#scratch
.register %g3,#scratch
.register %g6,#scratch
.text
ENTRY(__mempcpy_ultra3)
ba,pt %XCC, 101f
add %o0, %o2, %g5
END(__mempcpy_ultra3)
/* Special/non-trivial issues of this code:
*
* 1) %o5 is preserved from VISEntryHalf to VISExitHalf
* 2) Only low 32 FPU registers are used so that only the
* lower half of the FPU register set is dirtied by this
* code. This is especially important in the kernel.
* 3) This code never prefetches cachelines past the end
* of the source buffer.
*
* The cheetah's flexible spine, oversized liver, enlarged heart,
* slender muscular body, and claws make it the swiftest hunter
* in Africa and the fastest animal on land. Can reach speeds
* of up to 2.4GB per second.
*/
.align 32
ENTRY(__memcpy_ultra3)
100: /* %o0=dst, %o1=src, %o2=len */
mov %o0, %g5
101:
cmp %o2, 0
be,pn %XCC, out
218: or %o0, %o1, %o3
cmp %o2, 16
bleu,a,pn %XCC, small_copy
or %o3, %o2, %o3
cmp %o2, 256
blu,pt %XCC, medium_copy
andcc %o3, 0x7, %g0
ba,pt %xcc, enter
andcc %o0, 0x3f, %g2
/* Here len >= 256 and condition codes reflect execution
* of "andcc %o0, 0x7, %g2", done by caller.
*/
.align 64
enter:
/* Is 'dst' already aligned on an 64-byte boundary? */
be,pt %XCC, 2f
/* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number
* of bytes to copy to make 'dst' 64-byte aligned. We pre-
* subtract this from 'len'.
*/
sub %g2, 0x40, %g2
sub %g0, %g2, %g2
sub %o2, %g2, %o2
/* Copy %g2 bytes from src to dst, one byte at a time. */
1: ldub [%o1 + 0x00], %o3
add %o1, 0x1, %o1
add %o0, 0x1, %o0
subcc %g2, 0x1, %g2
bg,pt %XCC, 1b
stb %o3, [%o0 + -1]
2: VISEntryHalf
and %o1, 0x7, %g1
ba,pt %xcc, begin
alignaddr %o1, %g0, %o1
.align 64
begin:
prefetch [%o1 + 0x000], #one_read
prefetch [%o1 + 0x040], #one_read
andn %o2, (0x40 - 1), %o4
prefetch [%o1 + 0x080], #one_read
prefetch [%o1 + 0x0c0], #one_read
ldd [%o1 + 0x000], %f0
prefetch [%o1 + 0x100], #one_read
ldd [%o1 + 0x008], %f2
prefetch [%o1 + 0x140], #one_read
ldd [%o1 + 0x010], %f4
prefetch [%o1 + 0x180], #one_read
faligndata %f0, %f2, %f16
ldd [%o1 + 0x018], %f6
faligndata %f2, %f4, %f18
ldd [%o1 + 0x020], %f8
faligndata %f4, %f6, %f20
ldd [%o1 + 0x028], %f10
faligndata %f6, %f8, %f22
ldd [%o1 + 0x030], %f12
faligndata %f8, %f10, %f24
ldd [%o1 + 0x038], %f14
faligndata %f10, %f12, %f26
ldd [%o1 + 0x040], %f0
sub %o4, 0x80, %o4
add %o1, 0x40, %o1
ba,pt %xcc, loop
srl %o4, 6, %o3
.align 64
loop:
ldd [%o1 + 0x008], %f2
faligndata %f12, %f14, %f28
ldd [%o1 + 0x010], %f4
faligndata %f14, %f0, %f30
stda %f16, [%o0] ASI_BLK_P
ldd [%o1 + 0x018], %f6
faligndata %f0, %f2, %f16
ldd [%o1 + 0x020], %f8
faligndata %f2, %f4, %f18
ldd [%o1 + 0x028], %f10
faligndata %f4, %f6, %f20
ldd [%o1 + 0x030], %f12
faligndata %f6, %f8, %f22
ldd [%o1 + 0x038], %f14
faligndata %f8, %f10, %f24
ldd [%o1 + 0x040], %f0
prefetch [%o1 + 0x180], #one_read
faligndata %f10, %f12, %f26
subcc %o3, 0x01, %o3
add %o1, 0x40, %o1
bg,pt %XCC, loop
add %o0, 0x40, %o0
/* Finally we copy the last full 64-byte block. */
loopfini:
ldd [%o1 + 0x008], %f2
faligndata %f12, %f14, %f28
ldd [%o1 + 0x010], %f4
faligndata %f14, %f0, %f30
stda %f16, [%o0] ASI_BLK_P
ldd [%o1 + 0x018], %f6
faligndata %f0, %f2, %f16
ldd [%o1 + 0x020], %f8
faligndata %f2, %f4, %f18
ldd [%o1 + 0x028], %f10
faligndata %f4, %f6, %f20
ldd [%o1 + 0x030], %f12
faligndata %f6, %f8, %f22
ldd [%o1 + 0x038], %f14
faligndata %f8, %f10, %f24
cmp %g1, 0
be,pt %XCC, 1f
add %o0, 0x40, %o0
ldd [%o1 + 0x040], %f0
1: faligndata %f10, %f12, %f26
faligndata %f12, %f14, %f28
faligndata %f14, %f0, %f30
stda %f16, [%o0] ASI_BLK_P
add %o0, 0x40, %o0
add %o1, 0x40, %o1
membar #Sync
/* Now we copy the (len modulo 64) bytes at the end.
* Note how we borrow the %f0 loaded above.
*
* Also notice how this code is careful not to perform a
* load past the end of the src buffer.
*/
loopend:
and %o2, 0x3f, %o2
andcc %o2, 0x38, %g2
be,pn %XCC, endcruft
subcc %g2, 0x8, %g2
be,pn %XCC, endcruft
cmp %g1, 0
be,a,pt %XCC, 1f
ldd [%o1 + 0x00], %f0
1: ldd [%o1 + 0x08], %f2
add %o1, 0x8, %o1
sub %o2, 0x8, %o2
subcc %g2, 0x8, %g2
faligndata %f0, %f2, %f8
std %f8, [%o0 + 0x00]
be,pn %XCC, endcruft
add %o0, 0x8, %o0
ldd [%o1 + 0x08], %f0
add %o1, 0x8, %o1
sub %o2, 0x8, %o2
subcc %g2, 0x8, %g2
faligndata %f2, %f0, %f8
std %f8, [%o0 + 0x00]
bne,pn %XCC, 1b
add %o0, 0x8, %o0
/* If anything is left, we copy it one byte at a time.
* Note that %g1 is (src & 0x3) saved above before the
* alignaddr was performed.
*/
endcruft:
cmp %o2, 0
add %o1, %g1, %o1
VISExitHalf
be,pn %XCC, out
sub %o0, %o1, %o3
andcc %g1, 0x7, %g0
bne,pn %icc, small_copy_unaligned
andcc %o2, 0x8, %g0
be,pt %icc, 1f
nop
ldx [%o1], %o5
stx %o5, [%o1 + %o3]
add %o1, 0x8, %o1
1: andcc %o2, 0x4, %g0
be,pt %icc, 1f
nop
lduw [%o1], %o5
stw %o5, [%o1 + %o3]
add %o1, 0x4, %o1
1: andcc %o2, 0x2, %g0
be,pt %icc, 1f
nop
lduh [%o1], %o5
sth %o5, [%o1 + %o3]
add %o1, 0x2, %o1
1: andcc %o2, 0x1, %g0
be,pt %icc, out
nop
ldub [%o1], %o5
ba,pt %xcc, out
stb %o5, [%o1 + %o3]
medium_copy: /* 16 < len <= 64 */
bne,pn %XCC, small_copy_unaligned
sub %o0, %o1, %o3
medium_copy_aligned:
andn %o2, 0x7, %o4
and %o2, 0x7, %o2
1: subcc %o4, 0x8, %o4
ldx [%o1], %o5
stx %o5, [%o1 + %o3]
bgu,pt %XCC, 1b
add %o1, 0x8, %o1
andcc %o2, 0x4, %g0
be,pt %XCC, 1f
nop
sub %o2, 0x4, %o2
lduw [%o1], %o5
stw %o5, [%o1 + %o3]
add %o1, 0x4, %o1
1: cmp %o2, 0
be,pt %XCC, out
nop
ba,pt %xcc, small_copy_unaligned
nop
small_copy: /* 0 < len <= 16 */
andcc %o3, 0x3, %g0
bne,pn %XCC, small_copy_unaligned
sub %o0, %o1, %o3
small_copy_aligned:
subcc %o2, 4, %o2
lduw [%o1], %g1
stw %g1, [%o1 + %o3]
bgu,pt %XCC, small_copy_aligned
add %o1, 4, %o1
out: retl
mov %g5, %o0
.align 32
small_copy_unaligned:
subcc %o2, 1, %o2
ldub [%o1], %g1
stb %g1, [%o1 + %o3]
bgu,pt %XCC, small_copy_unaligned
add %o1, 1, %o1
retl
mov %g5, %o0
END(__memcpy_ultra3)
#endif
|
