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authorRoland McGrath <roland@gnu.org>1995-10-16 01:37:51 +0000
committerRoland McGrath <roland@gnu.org>1995-10-16 01:37:51 +0000
commit8f5ca04bc7fd53741d80117df992995ace8f6d2d (patch)
treee39c13fc198b22ec55647259a8080051988e8c69 /sysdeps/i386/i586/lshift.S
parent5d82cf5c55f56ae10d3b0a205d1fcc7de1cf56a0 (diff)
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Sat Oct 14 02:52:36 1995 Ulrich Drepper <drepper@ipd.info.uni-karlsruhe.de>
* malloc/malloc.c (_malloc_internal): Performance fix. Move if statement out of loop. * stdio/_itoa.c, stdio/_itoa.h: Complete rewrite. Much faster implementation using GMP functions. Contributed by Torbjorn Granlund and Ulrich Drepper. * stdio/test_rdwr.c: Include <errno.h>. * sysdeps/i386/i586/Implies: New file. New highly optimized string functions for i[345]86. * sysdeps/i386/memchr.S, sysdeps/i386/memcmp.S: New files. * sysdeps/i386/stpcpy.S, sysdeps/i386/stpncpy.S: New files. * sysdeps/i386/strchr.S, sysdeps/i386/strcspn.S: New files. * sysdeps/i386/strpbrk.S, sysdeps/i386/strrchr.S: New files. * sysdeps/i386/strspn.S, sysdeps/i386/i486/strcat.S: New files. * sysdeps/i386/i486/strlen.S, sysdeps/i386/i586/strchr.S: New files. * sysdeps/i386/i586/strlen.S: New file. * sysdeps/i386/memchr.c: Removed. There is now an assembler version. * sysdeps/i386/i586/memcopy.h (WORD_COPY_BWD): Parameters did not correspond to used values. * sysdeps/unix/sysv/linux/nfs/nfs.h: New file. Simply a wrapper around a kernel header file. * sysdeps/unix/sysv/linux/Dist: Add it. * sysdeps/unix/sysv/linux/Makefile [$(subdir)=sunrpc] (headers): Likewise. * sysdeps/unix/sysv/linux/local_lim.h: Rewrite. Instead of defining ourself we use a kernel header file. * sysdeps/unix/sysv/linux/i386/sysdep.h (DO_CALL): Optimize system call handler for i586. * sysdeps/unix/sysv/linux/sys/param.h: Add copyright and clean up. Sat Oct 14 02:52:36 1995 Ulrich Drepper <drepper@ipd.info.uni-karlsruhe.de> * malloc/malloc.c (_malloc_internal): Performance fix. Move if statement out of loop. * stdio/_itoa.c, stdio/_itoa.h: Complete rewrite. Much faster implementation using GMP functions. Contributed by Torbjorn Granlund and Ulrich Drepper. * stdio/test_rdwr.c: Include <errno.h>. * sysdeps/i386/i586/Implies: New file. New highly optimized string functions for i[345]86. * sysdeps/i386/memchr.S, sysdeps/i386/memcmp.S: New files. * sysdeps/i386/stpcpy.S, sysdeps/i386/stpncpy.S: New files. * sysdeps/i386/strchr.S, sysdeps/i386/strcspn.S: New files. * sysdeps/i386/strpbrk.S, sysdeps/i386/strrchr.S: New files. * sysdeps/i386/strspn.S, sysdeps/i386/i486/strcat.S: New files. * sysdeps/i386/i486/strlen.S, sysdeps/i386/i586/strchr.S: New files. * sysdeps/i386/i586/strlen.S: New file. * sysdeps/i386/memchr.c: Removed. There is now an assembler version. * sysdeps/i386/i586/memcopy.h (WORD_COPY_BWD): Parameters did not correspond to used values. * sysdeps/unix/sysv/linux/nfs/nfs.h: New file. Simply a wrapper around a kernel header file. * sysdeps/unix/sysv/linux/Dist: Add it. * sysdeps/unix/sysv/linux/Makefile [$(subdir)=sunrpc] (headers): Likewise. * sysdeps/unix/sysv/linux/local_lim.h: Rewrite. Instead of defining ourself we use a kernel header file. * sysdeps/unix/sysv/linux/i386/sysdep.h (DO_CALL): Optimize system call handler for i586. * sysdeps/unix/sysv/linux/sys/param.h: Add copyright and clean up.
Diffstat (limited to 'sysdeps/i386/i586/lshift.S')
-rw-r--r--sysdeps/i386/i586/lshift.S213
1 files changed, 213 insertions, 0 deletions
diff --git a/sysdeps/i386/i586/lshift.S b/sysdeps/i386/i586/lshift.S
new file mode 100644
index 0000000000..b9f8131297
--- /dev/null
+++ b/sysdeps/i386/i586/lshift.S
@@ -0,0 +1,213 @@
+/* Pentium optimized __mpn_lshift --
+
+Copyright (C) 1992, 1994, 1995 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 MP 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 MP Library; see the file COPYING.LIB. If not, write to
+the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/*
+ INPUT PARAMETERS
+ res_ptr (sp + 4)
+ s_ptr (sp + 8)
+ size (sp + 12)
+ cnt (sp + 16)
+*/
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+.text
+ ALIGN (3)
+ .globl C_SYMBOL_NAME(__mpn_lshift)
+C_SYMBOL_NAME(__mpn_lshift:)
+ pushl %edi
+ pushl %esi
+ pushl %ebx
+ pushl %ebp
+
+ movl 20(%esp),%edi /* res_ptr */
+ movl 24(%esp),%esi /* s_ptr */
+ movl 28(%esp),%ebp /* size */
+ movl 32(%esp),%ecx /* cnt */
+
+ cmp $1,%ecx
+ jne Lnormal
+ movl %edi,%eax
+ subl %esi,%eax
+ cmpl %ebp,%eax
+ jnc Lspecial
+
+Lnormal:
+ leal -4(%edi,%ebp,4),%edi
+ leal -4(%esi,%ebp,4),%esi
+
+ movl (%esi),%edx
+ subl $4,%esi
+ xorl %eax,%eax
+ shldl %cl,%edx,%eax /* compute carry limb */
+ pushl %eax /* push carry limb onto stack */
+
+ decl %ebp
+ pushl %ebp
+ shrl $3,%ebp
+ jz Lend
+
+ movl (%edi),%eax /* fetch destination cache line */
+
+ ALIGN (2)
+Loop: movl -28(%edi),%eax /* fetch destination cache line */
+ movl %edx,%ebx
+
+ movl (%esi),%eax
+ movl -4(%esi),%edx
+ shldl %cl,%eax,%ebx
+ shldl %cl,%edx,%eax
+ movl %ebx,(%edi)
+ movl %eax,-4(%edi)
+
+ movl -8(%esi),%ebx
+ movl -12(%esi),%eax
+ shldl %cl,%ebx,%edx
+ shldl %cl,%eax,%ebx
+ movl %edx,-8(%edi)
+ movl %ebx,-12(%edi)
+
+ movl -16(%esi),%edx
+ movl -20(%esi),%ebx
+ shldl %cl,%edx,%eax
+ shldl %cl,%ebx,%edx
+ movl %eax,-16(%edi)
+ movl %edx,-20(%edi)
+
+ movl -24(%esi),%eax
+ movl -28(%esi),%edx
+ shldl %cl,%eax,%ebx
+ shldl %cl,%edx,%eax
+ movl %ebx,-24(%edi)
+ movl %eax,-28(%edi)
+
+ subl $32,%esi
+ subl $32,%edi
+ decl %ebp
+ jnz Loop
+
+Lend: popl %ebp
+ andl $7,%ebp
+ jz Lend2
+Loop2: movl (%esi),%eax
+ shldl %cl,%eax,%edx
+ movl %edx,(%edi)
+ movl %eax,%edx
+ subl $4,%esi
+ subl $4,%edi
+ decl %ebp
+ jnz Loop2
+
+Lend2: shll %cl,%edx /* compute least significant limb */
+ movl %edx,(%edi) /* store it */
+
+ popl %eax /* pop carry limb */
+
+ popl %ebp
+ popl %ebx
+ popl %esi
+ popl %edi
+ ret
+
+/* We loop from least significant end of the arrays, which is only
+ permissable if the source and destination don't overlap, since the
+ function is documented to work for overlapping source and destination.
+*/
+
+Lspecial:
+ movl (%esi),%edx
+ addl $4,%esi
+
+ decl %ebp
+ pushl %ebp
+ shrl $3,%ebp
+
+ addl %edx,%edx
+ incl %ebp
+ decl %ebp
+ jz LLend
+
+ movl (%edi),%eax /* fetch destination cache line */
+
+ ALIGN (2)
+LLoop: movl 28(%edi),%eax /* fetch destination cache line */
+ movl %edx,%ebx
+
+ movl (%esi),%eax
+ movl 4(%esi),%edx
+ adcl %eax,%eax
+ movl %ebx,(%edi)
+ adcl %edx,%edx
+ movl %eax,4(%edi)
+
+ movl 8(%esi),%ebx
+ movl 12(%esi),%eax
+ adcl %ebx,%ebx
+ movl %edx,8(%edi)
+ adcl %eax,%eax
+ movl %ebx,12(%edi)
+
+ movl 16(%esi),%edx
+ movl 20(%esi),%ebx
+ adcl %edx,%edx
+ movl %eax,16(%edi)
+ adcl %ebx,%ebx
+ movl %edx,20(%edi)
+
+ movl 24(%esi),%eax
+ movl 28(%esi),%edx
+ adcl %eax,%eax
+ movl %ebx,24(%edi)
+ adcl %edx,%edx
+ movl %eax,28(%edi)
+
+ leal 32(%esi),%esi /* use leal not to clobber carry */
+ leal 32(%edi),%edi
+ decl %ebp
+ jnz LLoop
+
+LLend: popl %ebp
+ sbbl %eax,%eax /* save carry in %eax */
+ andl $7,%ebp
+ jz LLend2
+ addl %eax,%eax /* restore carry from eax */
+LLoop2: movl %edx,%ebx
+ movl (%esi),%edx
+ adcl %edx,%edx
+ movl %ebx,(%edi)
+
+ leal 4(%esi),%esi /* use leal not to clobber carry */
+ leal 4(%edi),%edi
+ decl %ebp
+ jnz LLoop2
+
+ jmp LL1
+LLend2: addl %eax,%eax /* restore carry from eax */
+LL1: movl %edx,(%edi) /* store last limb */
+
+ sbbl %eax,%eax
+ negl %eax
+
+ popl %ebp
+ popl %ebx
+ popl %esi
+ popl %edi
+ ret