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dnl x86-64 mpn_add_n/mpn_sub_n optimized for Pentium 4.
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 2007, 2008, 2010-2012 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 AMD K8,K9 2.8
C AMD K10 2.8
C Intel P4 4
C Intel core2 3.6-5 (fluctuating)
C Intel corei ?
C Intel atom ?
C VIA nano ?
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`vp', `%rdx')
define(`n', `%rcx')
define(`cy', `%r8')
ifdef(`OPERATION_add_n', `
define(ADDSUB, add)
define(func, mpn_add_n)
define(func_nc, mpn_add_nc)')
ifdef(`OPERATION_sub_n', `
define(ADDSUB, sub)
define(func, mpn_sub_n)
define(func_nc, mpn_sub_nc)')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
ASM_START()
TEXT
PROLOGUE(func)
FUNC_ENTRY(4)
xor %r8, %r8
IFDOS(` jmp L(ent) ')
EPILOGUE()
PROLOGUE(func_nc)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
L(ent): push %rbx
push %r12
mov (vp), %r9
mov R32(n), R32(%rax)
and $3, R32(%rax)
jne L(n00) C n = 0, 4, 8, ...
mov R32(%r8), R32(%rbx)
mov (up), %r8
mov 8(up), %r10
ADDSUB %r9, %r8
mov 8(vp), %r9
setc R8(%rax)
lea -16(rp), rp
jmp L(L00)
L(n00): cmp $2, R32(%rax)
jnc L(n01) C n = 1, 5, 9, ...
mov (up), %r11
mov R32(%r8), R32(%rax)
xor R32(%rbx), R32(%rbx)
dec n
jnz L(gt1)
ADDSUB %r9, %r11
setc R8(%rbx)
ADDSUB %rax, %r11
adc $0, R32(%rbx)
mov %r11, (rp)
jmp L(ret)
L(gt1): mov 8(up), %r8
ADDSUB %r9, %r11
mov 8(vp), %r9
setc R8(%rbx)
lea -8(rp), rp
lea 8(up), up
lea 8(vp), vp
jmp L(L01)
L(n01): jne L(n10) C n = 2, 6, 10, ...
mov (up), %r12
mov R32(%r8), R32(%rbx)
mov 8(up), %r11
ADDSUB %r9, %r12
mov 8(vp), %r9
setc R8(%rax)
lea -32(rp), rp
lea 16(up), up
lea 16(vp), vp
jmp L(L10)
L(n10): mov (up), %r10 C n = 3, 7, 11, ...
mov R32(%r8), R32(%rax)
xor R32(%rbx), R32(%rbx)
mov 8(up), %r12
ADDSUB %r9, %r10
mov 8(vp), %r9
setc R8(%rbx)
lea -24(rp), rp
lea -8(up), up
lea -8(vp), vp
jmp L(L11)
L(c0): mov $1, R8(%rbx)
jmp L(rc0)
L(c1): mov $1, R8(%rax)
jmp L(rc1)
L(c2): mov $1, R8(%rbx)
jmp L(rc2)
L(c3): mov $1, R8(%rax)
jmp L(rc3)
ALIGN(16)
L(top): mov (up), %r8 C not on critical path
ADDSUB %r9, %r11 C not on critical path
mov (vp), %r9 C not on critical path
setc R8(%rbx) C save carry out
mov %r12, (rp)
L(L01): ADDSUB %rax, %r11 C apply previous carry out
jc L(c0) C jump if ripple
L(rc0): mov 8(up), %r10
ADDSUB %r9, %r8
mov 8(vp), %r9
setc R8(%rax)
mov %r11, 8(rp)
L(L00): ADDSUB %rbx, %r8
jc L(c1)
L(rc1): mov 16(up), %r12
ADDSUB %r9, %r10
mov 16(vp), %r9
setc R8(%rbx)
mov %r8, 16(rp)
L(L11): ADDSUB %rax, %r10
jc L(c2)
L(rc2): mov 24(up), %r11
ADDSUB %r9, %r12
lea 32(up), up
mov 24(vp), %r9
lea 32(vp), vp
setc R8(%rax)
mov %r10, 24(rp)
L(L10): ADDSUB %rbx, %r12
jc L(c3)
L(rc3): lea 32(rp), rp
sub $4, n
ja L(top)
L(end): ADDSUB %r9, %r11
setc R8(%rbx)
mov %r12, (rp)
ADDSUB %rax, %r11
jnc L(1)
mov $1, R8(%rbx)
L(1): mov %r11, 8(rp)
L(ret): mov R32(%rbx), R32(%rax)
pop %r12
pop %rbx
FUNC_EXIT()
ret
EPILOGUE()
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