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dnl Intel Pentium-4 mpn_sub_n -- mpn subtraction.
dnl Copyright 2001, 2002 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C dst!=src1,2 dst==src1 dst==src2
C P6 model 0-8,10-12 -
C P6 model 9 (Banias) ?
C P6 model 13 (Dothan) ?
C P4 model 0-1 (Willamette) ?
C P4 model 2 (Northwood) 4 6 6
C P4 model 3-4 (Prescott) 4.25 7.5 7.5
defframe(PARAM_CARRY,20)
defframe(PARAM_SIZE, 16)
defframe(PARAM_SRC2, 12)
defframe(PARAM_SRC1, 8)
defframe(PARAM_DST, 4)
dnl re-use parameter space
define(SAVE_EBX,`PARAM_SRC1')
TEXT
ALIGN(8)
PROLOGUE(mpn_sub_nc)
deflit(`FRAME',0)
movd PARAM_CARRY, %mm0
jmp L(start_nc)
EPILOGUE()
ALIGN(8)
PROLOGUE(mpn_sub_n)
deflit(`FRAME',0)
pxor %mm0, %mm0
L(start_nc):
mov PARAM_SRC1, %eax
mov %ebx, SAVE_EBX
mov PARAM_SRC2, %ebx
mov PARAM_DST, %edx
mov PARAM_SIZE, %ecx
lea (%eax,%ecx,4), %eax C src1 end
lea (%ebx,%ecx,4), %ebx C src2 end
lea (%edx,%ecx,4), %edx C dst end
neg %ecx C -size
L(top):
C eax src1 end
C ebx src2 end
C ecx counter, limbs, negative
C edx dst end
C mm0 carry bit
movd (%eax,%ecx,4), %mm1
movd (%ebx,%ecx,4), %mm2
psubq %mm2, %mm1
psubq %mm0, %mm1
movd %mm1, (%edx,%ecx,4)
psrlq $63, %mm1
add $1, %ecx
jz L(done_mm1)
movd (%eax,%ecx,4), %mm0
movd (%ebx,%ecx,4), %mm2
psubq %mm2, %mm0
psubq %mm1, %mm0
movd %mm0, (%edx,%ecx,4)
psrlq $63, %mm0
add $1, %ecx
jnz L(top)
movd %mm0, %eax
mov SAVE_EBX, %ebx
emms
ret
L(done_mm1):
movd %mm1, %eax
mov SAVE_EBX, %ebx
emms
ret
EPILOGUE()
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