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- /* i80386 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
- the result from a second limb vector.
-
- Copyright (C) 1992, 1994 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)
- size (sp + 12)
- s2_limb (sp + 16)
- */
-
- #include "asm.h"
- #include "sysdep.h"
-
- #define res_ptr edi
- #define s1_ptr esi
- #define size ecx
- #define s2_limb ebp
-
- TEXT
- ALIGN
- GLOBL C_SYMBOL_NAME(__mpn_submul_1)
- C_SYMBOL_NAME(__mpn_submul_1):
-
- INSN1(push,l ,R(edi))
- INSN1(push,l ,R(esi))
- INSN1(push,l ,R(ebx))
- INSN1(push,l ,R(ebp))
-
- INSN2(mov,l ,R(res_ptr),MEM_DISP(esp,20))
- INSN2(mov,l ,R(s1_ptr),MEM_DISP(esp,24))
- INSN2(mov,l ,R(size),MEM_DISP(esp,28))
- INSN2(mov,l ,R(s2_limb),MEM_DISP(esp,32))
-
- INSN2(lea,l ,R(res_ptr),MEM_INDEX(res_ptr,size,4))
- INSN2(lea,l ,R(s1_ptr),MEM_INDEX(s1_ptr,size,4))
- INSN1(neg,l ,R(size))
- INSN2(xor,l ,R(ebx),R(ebx))
- Loop:
- INSN2(mov,l ,R(eax),MEM_INDEX(s1_ptr,size,4))
- INSN1(mul,l ,R(s2_limb))
- INSN2(add,l ,R(eax),R(ebx))
- INSN2(adc,l ,R(edx),$0)
- INSN2(sub,l ,MEM_INDEX(res_ptr,size,4),R(eax))
- INSN2(adc,l ,R(edx),$0)
- INSN2(mov,l ,R(ebx),R(edx))
-
- INSN1(inc,l ,R(size))
- INSN1(jnz, ,Loop)
- INSN2(mov,l ,R(eax),R(ebx))
-
- INSN1(pop,l ,R(ebp))
- INSN1(pop,l ,R(ebx))
- INSN1(pop,l ,R(esi))
- INSN1(pop,l ,R(edi))
- ret
-