github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpn/x86/pentium4/sse2/sub_n.asm (about)

     1  dnl  Intel Pentium-4 mpn_sub_n -- mpn subtraction.
     2  
     3  dnl  Copyright 2001, 2002 Free Software Foundation, Inc.
     4  
     5  dnl  This file is part of the GNU MP Library.
     6  dnl
     7  dnl  The GNU MP Library is free software; you can redistribute it and/or modify
     8  dnl  it under the terms of either:
     9  dnl
    10  dnl    * the GNU Lesser General Public License as published by the Free
    11  dnl      Software Foundation; either version 3 of the License, or (at your
    12  dnl      option) any later version.
    13  dnl
    14  dnl  or
    15  dnl
    16  dnl    * the GNU General Public License as published by the Free Software
    17  dnl      Foundation; either version 2 of the License, or (at your option) any
    18  dnl      later version.
    19  dnl
    20  dnl  or both in parallel, as here.
    21  dnl
    22  dnl  The GNU MP Library is distributed in the hope that it will be useful, but
    23  dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    24  dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    25  dnl  for more details.
    26  dnl
    27  dnl  You should have received copies of the GNU General Public License and the
    28  dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
    29  dnl  see https://www.gnu.org/licenses/.
    30  
    31  include(`../config.m4')
    32  
    33  
    34  C					cycles/limb
    35  C			     dst!=src1,2  dst==src1  dst==src2
    36  C P6 model 0-8,10-12		-
    37  C P6 model 9   (Banias)		?
    38  C P6 model 13  (Dothan)		?
    39  C P4 model 0-1 (Willamette)	?
    40  C P4 model 2   (Northwood)	4	     6		6
    41  C P4 model 3-4 (Prescott)	4.25	     7.5	7.5
    42  
    43  defframe(PARAM_CARRY,20)
    44  defframe(PARAM_SIZE, 16)
    45  defframe(PARAM_SRC2, 12)
    46  defframe(PARAM_SRC1, 8)
    47  defframe(PARAM_DST,  4)
    48  
    49  dnl  re-use parameter space
    50  define(SAVE_EBX,`PARAM_SRC1')
    51  
    52  	TEXT
    53  	ALIGN(8)
    54  
    55  PROLOGUE(mpn_sub_nc)
    56  deflit(`FRAME',0)
    57  	movd	PARAM_CARRY, %mm0
    58  	jmp	L(start_nc)
    59  EPILOGUE()
    60  
    61  	ALIGN(8)
    62  PROLOGUE(mpn_sub_n)
    63  deflit(`FRAME',0)
    64  	pxor	%mm0, %mm0
    65  L(start_nc):
    66  	mov	PARAM_SRC1, %eax
    67  	mov	%ebx, SAVE_EBX
    68  	mov	PARAM_SRC2, %ebx
    69  	mov	PARAM_DST, %edx
    70  	mov	PARAM_SIZE, %ecx
    71  
    72  	lea	(%eax,%ecx,4), %eax	C src1 end
    73  	lea	(%ebx,%ecx,4), %ebx	C src2 end
    74  	lea	(%edx,%ecx,4), %edx	C dst end
    75  	neg	%ecx			C -size
    76  
    77  L(top):
    78  	C eax	src1 end
    79  	C ebx	src2 end
    80  	C ecx	counter, limbs, negative
    81  	C edx	dst end
    82  	C mm0	carry bit
    83  
    84  	movd	(%eax,%ecx,4), %mm1
    85  	movd	(%ebx,%ecx,4), %mm2
    86  	psubq	%mm2, %mm1
    87  
    88  	psubq	%mm0, %mm1
    89  	movd	%mm1, (%edx,%ecx,4)
    90  
    91  	psrlq	$63, %mm1
    92  
    93  	add	$1, %ecx
    94  	jz	L(done_mm1)
    95  
    96  	movd	(%eax,%ecx,4), %mm0
    97  	movd	(%ebx,%ecx,4), %mm2
    98  	psubq	%mm2, %mm0
    99  
   100  	psubq	%mm1, %mm0
   101  	movd	%mm0, (%edx,%ecx,4)
   102  
   103  	psrlq	$63, %mm0
   104  
   105  	add	$1, %ecx
   106  	jnz	L(top)
   107  
   108  	movd	%mm0, %eax
   109  	mov	SAVE_EBX, %ebx
   110  	emms
   111  	ret
   112  
   113  L(done_mm1):
   114  	movd	%mm1, %eax
   115  	mov	SAVE_EBX, %ebx
   116  	emms
   117  	ret
   118  
   119  EPILOGUE()