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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/i386/i586
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initial import
Diffstat (limited to 'sysdeps/i386/i586')
-rw-r--r--sysdeps/i386/i586/memcopy.h94
1 files changed, 94 insertions, 0 deletions
diff --git a/sysdeps/i386/i586/memcopy.h b/sysdeps/i386/i586/memcopy.h
new file mode 100644
index 0000000000..a9bb9e7a40
--- /dev/null
+++ b/sysdeps/i386/i586/memcopy.h
@@ -0,0 +1,94 @@
+/* memcopy.h -- definitions for memory copy functions. Pentium version.
+ Copyright (C) 1994 Free Software Foundation, Inc.
+ Contributed by Torbjorn Granlund (tege@sics.se).
+
+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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/* Get the i386 definitions. We will override some of them below. */
+#include_next <memcopy.h>
+
+
+/* Written like this, the Pentium pipeline can execute the loop at a
+ sustained rate of 2 instructions/clock, or asymptotically 480
+ Mbytes/second at 60Mhz. */
+
+#undef WORD_COPY_FWD
+#define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \
+ do \
+ { \
+ asm volatile ("subl $32,%2\n" \
+ "js 2f\n" \
+ "1:\n" \
+ "movl 0(%1),%%eax\n" \
+ "movl 4(%1),%%edx\n" \
+ "movl %%eax,0(%0)\n" \
+ "movl %%edx,4(%0)\n" \
+ "movl 8(%1),%%eax\n" \
+ "movl 12(%1),%%edx\n" \
+ "movl %%eax,8(%0)\n" \
+ "movl %%edx,12(%0)\n" \
+ "movl 16(%1),%%eax\n" \
+ "movl 20(%1),%%edx\n" \
+ "movl %%eax,16(%0)\n" \
+ "movl %%edx,20(%0)\n" \
+ "movl 24(%1),%%eax\n" \
+ "movl 28(%1),%%edx\n" \
+ "movl %%eax,24(%0)\n" \
+ "movl %%edx,28(%0)\n" \
+ "addl $32,%1\n" \
+ "addl $32,%0\n" \
+ "subl $32,%2\n" \
+ "jns 1b\n" \
+ "2: addl $32,%2" : \
+ "=r" (dst_bp), "=r" (src_bp), "=r" (nbytes_left) : \
+ "0" (dst_bp), "1" (src_bp), "2" (nbytes) : \
+ "ax", "dx"); \
+ } while (0)
+
+#undef WORD_COPY_BWD
+#define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \
+ do \
+ { \
+ asm volatile ("subl $32,%2\n" \
+ "js 2f\n" \
+ "1:\n" \
+ "movl -4(%1),%%eax\n" \
+ "movl -8(%1),%%edx\n" \
+ "movl %%eax,-4(%0)\n" \
+ "movl %%edx,-8(%0)\n" \
+ "movl -12(%1),%%eax\n" \
+ "movl -16(%1),%%edx\n" \
+ "movl %%eax,-12(%0)\n" \
+ "movl %%edx,-16(%0)\n" \
+ "movl -20(%1),%%eax\n" \
+ "movl -24(%1),%%edx\n" \
+ "movl %%eax,-20(%0)\n" \
+ "movl %%edx,-24(%0)\n" \
+ "movl -28(%1),%%eax\n" \
+ "movl -32(%1),%%edx\n" \
+ "movl %%eax,-28(%0)\n" \
+ "movl %%edx,-32(%0)\n" \
+ "subl $32,%1\n" \
+ "subl $32,%0\n" \
+ "subl $32,%2\n" \
+ "jns 1b\n" \
+ "2: addl $32,%2" : \
+ "=r" (dst_bp), "=r" (src_bp), "=r" (nbytes_left) : \
+ "0" (dst_bp), "1" (src_bp), "2" (nbytes) : \
+ "ax", "dx"); \
+ } while (0)