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-rw-r--r--sysdeps/mips/mips64/memset.S92
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diff --git a/sysdeps/mips/mips64/memset.S b/sysdeps/mips/mips64/memset.S
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-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Hartvig Ekner <hartvige@mips.com>, 2002.
- Ported to mips3 n32/n64 by Alexandre Oliva <aoliva@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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#include <sysdep.h>
-#include <endian.h>
-#include <sys/asm.h>
-
-
-/* void *memset(void *s, int c, size_t n);
-
- This could probably be optimized further. */
-
-#if __BYTE_ORDER == __BIG_ENDIAN
-# define SDHI sdl /* high part is left in big-endian */
-#else
-# define SDHI sdr /* high part is right in little-endian */
-#endif
-
-ENTRY (memset)
- .set noreorder
-
- slti ta1, a2, 16 # Less than 16?
- bne ta1, zero, L(last16)
- move v0, a0 # Setup exit value before too late
-
- beq a1, zero, L(ueven) # If zero pattern, no need to extend
- andi a1, 0xff # Avoid problems with bogus arguments
- dsll ta0, a1, 8
- or a1, ta0
- dsll ta0, a1, 16
- or a1, ta0 # a1 is now pattern in full word
- dsll ta0, a1, 32
- or a1, ta0 # a1 is now pattern in double word
-
-L(ueven):
- PTR_SUBU ta0, zero, a0 # Unaligned address?
- andi ta0, 0x7
- beq ta0, zero, L(chkw)
- PTR_SUBU a2, ta0
- SDHI a1, 0(a0) # Yes, handle first unaligned part
- PTR_ADDU a0, ta0 # Now both a0 and a2 are updated
-
-L(chkw):
- andi ta0, a2, 0xf # Enough left for one loop iteration?
- beq ta0, a2, L(chkl)
- PTR_SUBU a3, a2, ta0
- PTR_ADDU a3, a0 # a3 is last loop address +1
- move a2, ta0 # a2 is now # of bytes left after loop
-L(loopw):
- PTR_ADDIU a0, 16 # Handle 2 dwords pr. iteration
- sd a1, -16(a0)
- bne a0, a3, L(loopw)
- sd a1, -8(a0)
-
-L(chkl):
- andi ta0, a2, 0x8 # Check if there is at least a double
- beq ta0, zero, L(last16) # word remaining after the loop
- PTR_SUBU a2, ta0
- sd a1, 0(a0) # Yes...
- PTR_ADDIU a0, 8
-
-L(last16):
- blez a2, L(exit) # Handle last 16 bytes (if cnt>0)
- PTR_ADDU a3, a2, a0 # a3 is last address +1
-L(lst16l):
- PTR_ADDIU a0, 1
- bne a0, a3, L(lst16l)
- sb a1, -1(a0)
-L(exit):
- j ra # Bye, bye
- nop
-
- .set reorder
-END (memset)
-libc_hidden_builtin_def (memset)