diff options
Diffstat (limited to 'sysdeps/i386/i586/sub_n.S')
| -rw-r--r-- | sysdeps/i386/i586/sub_n.S | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/sysdeps/i386/i586/sub_n.S b/sysdeps/i386/i586/sub_n.S new file mode 100644 index 0000000000..1382e665f6 --- /dev/null +++ b/sysdeps/i386/i586/sub_n.S @@ -0,0 +1,136 @@ +/* Pentium __mpn_sub_n -- Subtract two limb vectors of the same length > 0 + and store difference in a third limb vector. + +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) + s1_ptr (sp + 8) + s2_ptr (sp + 12) + size (sp + 16) +*/ + +#define r1 %eax +#define r2 %edx +#define src1 %esi +#define src2 %ebp +#define dst %edi +#define x %ebx + +#include "sysdep.h" +#include "asm-syntax.h" + +.text + ALIGN (3) + .globl C_SYMBOL_NAME(__mpn_sub_n) +C_SYMBOL_NAME(__mpn_sub_n:) + pushl %edi + pushl %esi + pushl %ebx + pushl %ebp + + movl 20(%esp),dst /* res_ptr */ + movl 24(%esp),src1 /* s1_ptr */ + movl 28(%esp),src2 /* s2_ptr */ + movl 32(%esp),%ecx /* size */ + + movl (src2),x + + decl %ecx + movl %ecx,r2 + shrl $3,%ecx + andl $7,r2 + testl %ecx,%ecx /* zero carry flag */ + jz Lend + pushl r2 + + ALIGN (3) +Loop: movl 28(dst),%eax /* fetch destination cache line */ + leal 32(dst),dst + +L1: movl (src1),r1 + movl 4(src1),r2 + sbbl x,r1 + movl 4(src2),x + sbbl x,r2 + movl 8(src2),x + movl r1,-32(dst) + movl r2,-28(dst) + +L2: movl 8(src1),r1 + movl 12(src1),r2 + sbbl x,r1 + movl 12(src2),x + sbbl x,r2 + movl 16(src2),x + movl r1,-24(dst) + movl r2,-20(dst) + +L3: movl 16(src1),r1 + movl 20(src1),r2 + sbbl x,r1 + movl 20(src2),x + sbbl x,r2 + movl 24(src2),x + movl r1,-16(dst) + movl r2,-12(dst) + +L4: movl 24(src1),r1 + movl 28(src1),r2 + sbbl x,r1 + movl 28(src2),x + sbbl x,r2 + movl 32(src2),x + movl r1,-8(dst) + movl r2,-4(dst) + + leal 32(src1),src1 + leal 32(src2),src2 + decl %ecx + jnz Loop + + popl r2 +Lend: + decl r2 /* test r2 w/o clobbering carry */ + js Lend2 + incl r2 +Loop2: + leal 4(dst),dst + movl (src1),r1 + sbbl x,r1 + movl 4(src2),x + movl r1,-4(dst) + leal 4(src1),src1 + leal 4(src2),src2 + decl r2 + jnz Loop2 +Lend2: + movl (src1),r1 + sbbl x,r1 + movl r1,(dst) + + sbbl %eax,%eax + negl %eax + + popl %ebp + popl %ebx + popl %esi + popl %edi + ret |