Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpn / x86 / copyd.asm

diff --git a/gmp/mpn/x86/copyd.asm b/gmp/mpn/x86/copyd.asm
new file mode 100644 (file)
index 0000000..4ce3bbb
--- /dev/null
+++ b/gmp/mpn/x86/copyd.asm
@@ -0,0 +1,80 @@
+dnl  x86 mpn_copyd -- copy limb vector, decrementing.
+
+dnl  Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+dnl
+dnl  This file is part of the GNU MP Library.
+dnl
+dnl  The GNU MP Library is free software; you can redistribute it and/or
+dnl  modify it under the terms of the GNU Lesser General Public License as
+dnl  published by the Free Software Foundation; either version 3 of the
+dnl  License, or (at your option) any later version.
+dnl
+dnl  The GNU MP Library is distributed in the hope that it will be useful,
+dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+dnl  Lesser General Public License for more details.
+dnl
+dnl  You should have received a copy of the GNU Lesser General Public License
+dnl  along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+
+C     cycles/limb  startup (approx)
+C P5:     1.0         40
+C P6      2.4         70
+C K6      1.0         55
+C K7:     1.3         75
+C P4:     2.6        175
+C
+C (Startup time includes some function call overheads.)
+
+
+C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
+C
+C Copy src,size to dst,size, working from high to low addresses.
+C
+C The code here is very generic and can be expected to be reasonable on all
+C the x86 family.
+
+defframe(PARAM_SIZE,12)
+defframe(PARAM_SRC, 8)
+defframe(PARAM_DST, 4)
+deflit(`FRAME',0)
+
+       TEXT
+       ALIGN(32)
+
+PROLOGUE(mpn_copyd)
+       C eax   saved esi
+       C ebx
+       C ecx   counter
+       C edx   saved edi
+       C esi   src
+       C edi   dst
+       C ebp
+
+       movl    PARAM_SIZE, %ecx
+       movl    %esi, %eax
+
+       movl    PARAM_SRC, %esi
+       movl    %edi, %edx
+
+       movl    PARAM_DST, %edi
+       leal    -4(%esi,%ecx,4), %esi
+
+       leal    -4(%edi,%ecx,4), %edi
+
+       std
+
+       rep
+       movsl
+
+       cld
+
+       movl    %eax, %esi
+       movl    %edx, %edi
+
+       ret
+
+EPILOGUE()