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dnl AMD64 mpn_addlshC_n, mpn_sublshC_n -- rp[] = up[] +- (vp[] << C), where
dnl C is 1, 2, 3. Optimized for Pentium 4.
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 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/.
C cycles/limb
C AMD K8,K9 3.8
C AMD K10 3.8
C Intel P4 5.8
C Intel core2 4.75
C Intel corei 4.75
C Intel atom ?
C VIA nano 4.75
C INPUT PARAMETERS
define(`rp',`%rdi')
define(`up',`%rsi')
define(`vp',`%rdx')
define(`n', `%rcx')
define(M, eval(m4_lshift(1,LSH)))
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(func)
FUNC_ENTRY(4)
push %rbx
push %r12
push %rbp
mov (vp), %r9
shl $LSH, %r9
mov 4(vp), R32(%rbp)
xor R32(%rbx), R32(%rbx)
mov R32(n), R32(%rax)
and $3, R32(%rax)
jne L(n00) C n = 0, 4, 8, ...
mov (up), %r8
mov 8(up), %r10
shr $RSH, R32(%rbp)
ADDSUB %r9, %r8
mov 8(vp), %r9
lea (%rbp,%r9,M), %r9
setc R8(%rax)
mov 12(vp), R32(%rbp)
lea -16(rp), rp
jmp L(L00)
L(n00): cmp $2, R32(%rax)
jnc L(n01) C n = 1, 5, 9, ...
mov (up), %r11
lea -8(rp), rp
shr $RSH, R32(%rbp)
ADDSUB %r9, %r11
setc R8(%rbx)
dec n
jz L(1) C jump for n = 1
mov 8(up), %r8
mov 8(vp), %r9
lea (%rbp,%r9,M), %r9
mov 12(vp), R32(%rbp)
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 8(up), %r11
shr $RSH, R32(%rbp)
ADDSUB %r9, %r12
mov 8(vp), %r9
lea (%rbp,%r9,M), %r9
setc R8(%rax)
mov 12(vp), R32(%rbp)
lea 16(up), up
lea 16(vp), vp
jmp L(L10)
L(n10): mov (up), %r10
mov 8(up), %r12
shr $RSH, R32(%rbp)
ADDSUB %r9, %r10
mov 8(vp), %r9
lea (%rbp,%r9,M), %r9
setc R8(%rbx)
mov 12(vp), R32(%rbp)
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)
ALIGN(16)
L(top): mov (up), %r8 C not on critical path
shr $RSH, R32(%rbp)
ADDSUB %r9, %r11 C not on critical path
mov (vp), %r9
lea (%rbp,%r9,M), %r9
setc R8(%rbx) C save carry out
mov 4(vp), R32(%rbp)
mov %r12, (rp)
ADDSUB %rax, %r11 C apply previous carry out
jc L(c0) C jump if ripple
L(rc0):
L(L01): mov 8(up), %r10
shr $RSH, R32(%rbp)
ADDSUB %r9, %r8
mov 8(vp), %r9
lea (%rbp,%r9,M), %r9
setc R8(%rax)
mov 12(vp), R32(%rbp)
mov %r11, 8(rp)
ADDSUB %rbx, %r8
jc L(c1)
L(rc1):
L(L00): mov 16(up), %r12
shr $RSH, R32(%rbp)
ADDSUB %r9, %r10
mov 16(vp), %r9
lea (%rbp,%r9,M), %r9
setc R8(%rbx)
mov 20(vp), R32(%rbp)
mov %r8, 16(rp)
ADDSUB %rax, %r10
jc L(c2)
L(rc2):
L(L11): mov 24(up), %r11
shr $RSH, R32(%rbp)
ADDSUB %r9, %r12
mov 24(vp), %r9
lea (%rbp,%r9,M), %r9
lea 32(up), up
lea 32(vp), vp
setc R8(%rax)
mov -4(vp), R32(%rbp)
mov %r10, 24(rp)
ADDSUB %rbx, %r12
jc L(c3)
L(rc3): lea 32(rp), rp
L(L10): sub $4, n
ja L(top)
L(end):
shr $RSH, R32(%rbp)
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)
lea (%rbx,%rbp), R32(%rax)
pop %rbp
pop %r12
pop %rbx
FUNC_EXIT()
ret
L(c3): mov $1, R8(%rax)
jmp L(rc3)
EPILOGUE()
ASM_END()
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