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141 lines
3.8 KiB
ArmAsm
141 lines
3.8 KiB
ArmAsm
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Hartvig Ekner <hartvige@mips.com>, 2002.
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Ported to mips3 n32/n64 by Alexandre Oliva <aoliva@redhat.com>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <endian.h>
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#include <sys/asm.h>
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/* void *memcpy(void *s1, const void *s2, size_t n);
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This could probably be optimized further. */
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#if __BYTE_ORDER == __BIG_ENDIAN
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# define LDHI ldl /* high part is left in big-endian */
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# define SDHI sdl /* high part is left in big-endian */
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# define LDLO ldr /* low part is right in big-endian */
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# define SDLO sdr /* low part is right in big-endian */
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#else
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# define LDHI ldr /* high part is right in little-endian */
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# define SDHI sdr /* high part is right in little-endian */
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# define LDLO ldl /* low part is left in little-endian */
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# define SDLO sdl /* low part is left in little-endian */
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#endif
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ENTRY (memcpy)
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.set noreorder
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slti t0, a2, 16 # Less than 16?
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bne t0, zero, L(last16)
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move v0, a0 # Setup exit value before too late
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xor t0, a1, a0 # Find a0/a1 displacement
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andi t0, 0x7
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bne t0, zero, L(shift) # Go handle the unaligned case
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PTR_SUBU t1, zero, a1
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andi t1, 0x7 # a0/a1 are aligned, but are we
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beq t1, zero, L(chk8w) # starting in the middle of a word?
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PTR_SUBU a2, t1
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LDHI t0, 0(a1) # Yes we are... take care of that
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PTR_ADDU a1, t1
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SDHI t0, 0(a0)
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PTR_ADDU a0, t1
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L(chk8w):
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andi t0, a2, 0x3f # 64 or more bytes left?
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beq t0, a2, L(chk1w)
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PTR_SUBU a3, a2, t0 # Yes
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PTR_ADDU a3, a1 # a3 = end address of loop
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move a2, t0 # a2 = what will be left after loop
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L(lop8w):
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ld t0, 0(a1) # Loop taking 8 words at a time
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ld t1, 8(a1)
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ld t2, 16(a1)
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ld t3, 24(a1)
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ld ta0, 32(a1)
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ld ta1, 40(a1)
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ld ta2, 48(a1)
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ld ta3, 56(a1)
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PTR_ADDIU a0, 64
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PTR_ADDIU a1, 64
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sd t0, -64(a0)
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sd t1, -56(a0)
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sd t2, -48(a0)
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sd t3, -40(a0)
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sd ta0, -32(a0)
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sd ta1, -24(a0)
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sd ta2, -16(a0)
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bne a1, a3, L(lop8w)
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sd ta3, -8(a0)
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L(chk1w):
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andi t0, a2, 0x7 # 8 or more bytes left?
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beq t0, a2, L(last16)
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PTR_SUBU a3, a2, t0 # Yes, handle them one dword at a time
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PTR_ADDU a3, a1 # a3 again end address
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move a2, t0
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L(lop1w):
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ld t0, 0(a1)
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PTR_ADDIU a0, 8
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PTR_ADDIU a1, 8
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bne a1, a3, L(lop1w)
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sd t0, -8(a0)
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L(last16):
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blez a2, L(lst16e) # Handle last 16 bytes, one at a time
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PTR_ADDU a3, a2, a1
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L(lst16l):
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lb t0, 0(a1)
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PTR_ADDIU a0, 1
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PTR_ADDIU a1, 1
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bne a1, a3, L(lst16l)
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sb t0, -1(a0)
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L(lst16e):
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jr ra # Bye, bye
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nop
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L(shift):
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PTR_SUBU a3, zero, a0 # Src and Dest unaligned
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andi a3, 0x7 # (unoptimized case...)
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beq a3, zero, L(shft1)
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PTR_SUBU a2, a3 # a2 = bytes left
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LDHI t0, 0(a1) # Take care of first odd part
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LDLO t0, 7(a1)
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PTR_ADDU a1, a3
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SDHI t0, 0(a0)
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PTR_ADDU a0, a3
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L(shft1):
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andi t0, a2, 0x7
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PTR_SUBU a3, a2, t0
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PTR_ADDU a3, a1
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L(shfth):
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LDHI t1, 0(a1) # Limp through, dword by dword
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LDLO t1, 7(a1)
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PTR_ADDIU a0, 8
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PTR_ADDIU a1, 8
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bne a1, a3, L(shfth)
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sd t1, -8(a0)
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b L(last16) # Handle anything which may be left
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move a2, t0
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.set reorder
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END (memcpy)
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libc_hidden_builtin_def (memcpy)
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