dnl X86-64 mpn_mul_basecase optimised for Intel Nehalem/Westmere.
dnl It also seems good for Conroe/Wolfdale.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2008, 2011-2013 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 mul_1 mul_2 mul_3 addmul_2
C AMD K8,K9
C AMD K10
C AMD bull
C AMD pile
C AMD steam
C AMD bobcat
C AMD jaguar
C Intel P4
C Intel core 4.0 4.0 - 4.18-4.25
C Intel NHM 3.75 3.8 - 4.06-4.2
C Intel SBR
C Intel IBR
C Intel HWL
C Intel BWL
C Intel atom
C VIA nano
C The inner loops of this code are the result of running a code generation and
C optimisation tool suite written by David Harvey and Torbjörn Granlund.
C Code structure:
C
C
C m_1(0m4) m_1(1m4) m_1(2m4) m_1(3m4)
C | | | |
C m_2(0m4) | m_2(1m4) | m_2(2m4) | m_2(3m4) |
C | / | / | / | /
C | / | / | / | /
C | / | / | / | /
C \|/ |/_ \|/ |/_ \|/ |/_ \|/ |/_
C _____ _____ _____ _____
C / \ / \ / \ / \
C \|/ | \|/ | \|/ | \|/ |
C am_2(0m4) | am_2(1m4) | am_2(2m4) | am_2(3m4) |
C \ /|\ \ /|\ \ /|\ \ /|\
C \_____/ \_____/ \_____/ \_____/
C TODO
C * Tune. None done so far.
C * Currently 2687 bytes, making it smaller would be nice.
C * Implement some basecases, say for un < 4.
C * Try zeroing with xor in m2 loops.
C * Try re-rolling the m2 loops to avoid the current 9 insn code duplication
C between loop header and wind-down code.
C * Consider adc reg,reg instead of adc $0,reg in m2 loops. This save a byte.
C When playing with pointers, set this to $2 to fall back to conservative
C indexing in wind-down code.
define(`I',`$1')
C Define this to $1 to use late loop index variable as zero, $2 to use an
C explicit $0.
define(`Z',`$1')
define(`rp', `%rdi')
define(`up', `%rsi')
define(`un_param', `%rdx')
define(`vp_param', `%rcx') C FIXME reallocate vp to rcx but watch performance!
define(`vn_param', `%r8')
define(`un', `%r9')
define(`vn', `(%rsp)')
define(`v0', `%r10')
define(`v1', `%r11')
define(`w0', `%rbx')
define(`w1', `%rcx')
define(`w2', `%rbp')
define(`w3', `%r12')
define(`i', `%r13')
define(`vp', `%r14')
define(`X0', `%r8')
define(`X1', `%r15')
C rax rbx rcx rdx rdi rsi rbp r8 r9 r10 r11 r12 r13 r14 r15
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
define(`ALIGNx', `ALIGN(16)')
define(`N', 85)
ifdef(`N',,`define(`N',0)')
define(`MOV', `ifelse(eval(N & $3),0,`mov $1, $2',`lea ($1), $2')')
ASM_START()
TEXT
ALIGN(32)
PROLOGUE(mpn_mul_basecase)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8d ')
mov (up), %rax C shared for mul_1 and mul_2
push %rbx
push %rbp
push %r12
push %r13
push %r14
mov (vp_param), v0 C shared for mul_1 and mul_2
xor un, un
sub un_param, un C un = -un_param
lea (up,un_param,8), up
lea (rp,un_param,8), rp
mul v0 C shared for mul_1 and mul_2
test $1, R8(vn_param)
jz L(m2)
lea 8(vp_param), vp C FIXME: delay until known needed
test $1, R8(un)
jnz L(m1x1)
L(m1x0):test $2, R8(un)
jnz L(m1s2)
L(m1s0):
lea (un), i
mov %rax, (rp,un,8)
mov 8(up,un,8), %rax
mov %rdx, w0 C FIXME: Use lea?
lea L(do_am0)(%rip), %rbp
jmp L(m1e0)
L(m1s2):
lea 2(un), i
mov %rax, (rp,un,8)
mov 8(up,un,8), %rax
mov %rdx, w0 C FIXME: Use lea?
mul v0
lea L(do_am2)(%rip), %rbp
test i, i
jnz L(m1e2)
add %rax, w0
adc $0, %rdx
mov w0, I(-8(rp),8(rp,un,8))
mov %rdx, I((rp),16(rp,un,8))
jmp L(ret2)
L(m1x1):test $2, R8(un)
jz L(m1s3)
L(m1s1):
lea 1(un), i
mov %rax, (rp,un,8)
test i, i
jz L(1)
mov 8(up,un,8), %rax
mov %rdx, w1 C FIXME: Use lea?
lea L(do_am1)(%rip), %rbp
jmp L(m1e1)
L(1): mov %rdx, I((rp),8(rp,un,8))
jmp L(ret2)
L(m1s3):
lea -1(un), i
mov %rax, (rp,un,8)
mov 8(up,un,8), %rax
mov %rdx, w1 C FIXME: Use lea?
lea L(do_am3)(%rip), %rbp
jmp L(m1e3)
ALIGNx
L(m1top):
mul v0
mov w1, -16(rp,i,8)
L(m1e2):xor R32(w1), R32(w1)
add %rax, w0
mov (up,i,8), %rax
adc %rdx, w1
mov w0, -8(rp,i,8)
L(m1e1):xor R32(w0), R32(w0)
mul v0
add %rax, w1
mov 8(up,i,8), %rax
adc %rdx, w0
mov w1, (rp,i,8)
L(m1e0):xor R32(w1), R32(w1)
mul v0
add %rax, w0
mov 16(up,i,8), %rax
adc %rdx, w1
mov w0, 8(rp,i,8)
L(m1e3):xor R32(w0), R32(w0)
mul v0
add %rax, w1
mov 24(up,i,8), %rax
adc %rdx, w0
add $4, i
js L(m1top)
mul v0
mov w1, I(-16(rp),-16(rp,i,8))
add %rax, w0
adc $0, %rdx
mov w0, I(-8(rp),-8(rp,i,8))
mov %rdx, I((rp),(rp,i,8))
dec vn_param
jz L(ret2)
lea -8(rp), rp
jmp *%rbp
L(m2):
mov 8(vp_param), v1
lea 16(vp_param), vp C FIXME: delay until known needed
test $1, R8(un)
jnz L(bx1)
L(bx0): test $2, R8(un)
jnz L(b10)
L(b00): lea (un), i
mov %rax, (rp,un,8)
mov %rdx, w1 C FIXME: Use lea?
mov (up,un,8), %rax
mov $0, R32(w2)
jmp L(m2e0)
L(b10): lea -2(un), i
mov %rax, w2 C FIXME: Use lea?
mov (up,un,8), %rax
mov %rdx, w3 C FIXME: Use lea?
mov $0, R32(w0)
jmp L(m2e2)
L(bx1): test $2, R8(un)
jz L(b11)
L(b01): lea 1(un), i
mov %rax, (rp,un,8)
mov (up,un,8), %rax
mov %rdx, w0 C FIXME: Use lea?
mov $0, R32(w1)
jmp L(m2e1)
L(b11): lea -1(un), i
mov %rax, w1 C FIXME: Use lea?
mov (up,un,8), %rax
mov %rdx, w2 C FIXME: Use lea?
mov $0, R32(w3)
jmp L(m2e3)
ALIGNx
L(m2top0):
mul v0
add %rax, w3
mov -8(up,i,8), %rax
mov w3, -8(rp,i,8)
adc %rdx, w0
adc $0, R32(w1)
mul v1
add %rax, w0
adc %rdx, w1
mov $0, R32(w2)
mov (up,i,8), %rax
mul v0
add %rax, w0
mov w0, (rp,i,8)
adc %rdx, w1
mov (up,i,8), %rax
adc $0, R32(w2)
L(m2e0):mul v1
add %rax, w1
adc %rdx, w2
mov 8(up,i,8), %rax
mul v0
mov $0, R32(w3)
add %rax, w1
adc %rdx, w2
adc $0, R32(w3)
mov 8(up,i,8), %rax
mul v1
add %rax, w2
mov w1, 8(rp,i,8)
adc %rdx, w3
mov $0, R32(w0)
mov 16(up,i,8), %rax
mul v0
add %rax, w2
mov 16(up,i,8), %rax
adc %rdx, w3
adc $0, R32(w0)
mul v1
mov $0, R32(w1)
add %rax, w3
mov 24(up,i,8), %rax
mov w2, 16(rp,i,8)
adc %rdx, w0
add $4, i
js L(m2top0)
mul v0
add %rax, w3
mov I(-8(up),-8(up,i,8)), %rax
mov w3, I(-8(rp),-8(rp,i,8))
adc %rdx, w0
adc R32(w1), R32(w1)
mul v1
add %rax, w0
adc %rdx, w1
mov w0, I((rp),(rp,i,8))
mov w1, I(8(rp),8(rp,i,8))
add $-2, vn_param
jz L(ret2)
L(do_am0):
push %r15
push vn_param
L(olo0):
mov (vp), v0
mov 8(vp), v1
lea 16(vp), vp
lea 16(rp), rp
mov (up,un,8), %rax
C lea 0(un), i
mov un, i
mul v0
mov %rax, X0
mov (up,un,8), %rax
MOV( %rdx, X1, 2)
mul v1
MOV( %rdx, w0, 4)
mov (rp,un,8), w2
mov %rax, w3
jmp L(lo0)
ALIGNx
L(am2top0):
mul v1
add w0, w1
adc %rax, w2
mov (up,i,8), %rax
MOV( %rdx, w3, 1)
adc $0, w3
mul v0
add w1, X1
mov X1, -8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 2)
adc $0, X1
mov (up,i,8), %rax
mul v1
MOV( %rdx, w0, 4)
mov (rp,i,8), w1
add w1, w2
adc %rax, w3
adc $0, w0
L(lo0): mov 8(up,i,8), %rax
mul v0
add w2, X0
adc %rax, X1
mov X0, (rp,i,8)
MOV( %rdx, X0, 8)
adc $0, X0
mov 8(up,i,8), %rax
mov 8(rp,i,8), w2
mul v1
add w2, w3
adc %rax, w0
MOV( %rdx, w1, 16)
adc $0, w1
mov 16(up,i,8), %rax
mul v0
add w3, X1
mov X1, 8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 32)
mov 16(rp,i,8), w3
adc $0, X1
mov 16(up,i,8), %rax
mul v1
add w3, w0
MOV( %rdx, w2, 64)
adc %rax, w1
mov 24(up,i,8), %rax
adc $0, w2
mul v0
add w0, X0
mov X0, 16(rp,i,8)
MOV( %rdx, X0, 128)
adc %rax, X1
mov 24(up,i,8), %rax
mov 24(rp,i,8), w0
adc $0, X0
add $4, i
jnc L(am2top0)
mul v1
add w0, w1
adc %rax, w2
adc Z(i,$0), %rdx
add w1, X1
adc Z(i,$0), X0
mov X1, I(-8(rp),-8(rp,i,8))
add w2, X0
mov X0, I((rp),(rp,i,8))
adc Z(i,$0), %rdx
mov %rdx, I(8(rp),8(rp,i,8))
addl $-2, vn
jnz L(olo0)
L(ret): pop %rax
pop %r15
L(ret2):pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
FUNC_EXIT()
ret
ALIGNx
L(m2top1):
mul v0
add %rax, w3
mov -8(up,i,8), %rax
mov w3, -8(rp,i,8)
adc %rdx, w0
adc $0, R32(w1)
L(m2e1):mul v1
add %rax, w0
adc %rdx, w1
mov $0, R32(w2)
mov (up,i,8), %rax
mul v0
add %rax, w0
mov w0, (rp,i,8)
adc %rdx, w1
mov (up,i,8), %rax
adc $0, R32(w2)
mul v1
add %rax, w1
adc %rdx, w2
mov 8(up,i,8), %rax
mul v0
mov $0, R32(w3)
add %rax, w1
adc %rdx, w2
adc $0, R32(w3)
mov 8(up,i,8), %rax
mul v1
add %rax, w2
mov w1, 8(rp,i,8)
adc %rdx, w3
mov $0, R32(w0)
mov 16(up,i,8), %rax
mul v0
add %rax, w2
mov 16(up,i,8), %rax
adc %rdx, w3
adc $0, R32(w0)
mul v1
mov $0, R32(w1)
add %rax, w3
mov 24(up,i,8), %rax
mov w2, 16(rp,i,8)
adc %rdx, w0
add $4, i
js L(m2top1)
mul v0
add %rax, w3
mov I(-8(up),-8(up,i,8)), %rax
mov w3, I(-8(rp),-8(rp,i,8))
adc %rdx, w0
adc R32(w1), R32(w1)
mul v1
add %rax, w0
adc %rdx, w1
mov w0, I((rp),(rp,i,8))
mov w1, I(8(rp),8(rp,i,8))
add $-2, vn_param
jz L(ret2)
L(do_am1):
push %r15
push vn_param
L(olo1):
mov (vp), v0
mov 8(vp), v1
lea 16(vp), vp
lea 16(rp), rp
mov (up,un,8), %rax
lea 1(un), i
mul v0
mov %rax, X1
MOV( %rdx, X0, 128)
mov (up,un,8), %rax
mov (rp,un,8), w1
mul v1
mov %rax, w2
mov 8(up,un,8), %rax
MOV( %rdx, w3, 1)
jmp L(lo1)
ALIGNx
L(am2top1):
mul v1
add w0, w1
adc %rax, w2
mov (up,i,8), %rax
MOV( %rdx, w3, 1)
adc $0, w3
L(lo1): mul v0
add w1, X1
mov X1, -8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 2)
adc $0, X1
mov (up,i,8), %rax
mul v1
MOV( %rdx, w0, 4)
mov (rp,i,8), w1
add w1, w2
adc %rax, w3
adc $0, w0
mov 8(up,i,8), %rax
mul v0
add w2, X0
adc %rax, X1
mov X0, (rp,i,8)
MOV( %rdx, X0, 8)
adc $0, X0
mov 8(up,i,8), %rax
mov 8(rp,i,8), w2
mul v1
add w2, w3
adc %rax, w0
MOV( %rdx, w1, 16)
adc $0, w1
mov 16(up,i,8), %rax
mul v0
add w3, X1
mov X1, 8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 32)
mov 16(rp,i,8), w3
adc $0, X1
mov 16(up,i,8), %rax
mul v1
add w3, w0
MOV( %rdx, w2, 64)
adc %rax, w1
mov 24(up,i,8), %rax
adc $0, w2
mul v0
add w0, X0
mov X0, 16(rp,i,8)
MOV( %rdx, X0, 128)
adc %rax, X1
mov 24(up,i,8), %rax
mov 24(rp,i,8), w0
adc $0, X0
add $4, i
jnc L(am2top1)
mul v1
add w0, w1
adc %rax, w2
adc Z(i,$0), %rdx
add w1, X1
adc Z(i,$0), X0
mov X1, I(-8(rp),-8(rp,i,8))
add w2, X0
mov X0, I((rp),(rp,i,8))
adc Z(i,$0), %rdx
mov %rdx, I(8(rp),8(rp,i,8))
addl $-2, vn
jnz L(olo1)
pop %rax
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
FUNC_EXIT()
ret
ALIGNx
L(m2top2):
mul v0
add %rax, w3
mov -8(up,i,8), %rax
mov w3, -8(rp,i,8)
adc %rdx, w0
adc $0, R32(w1)
mul v1
add %rax, w0
adc %rdx, w1
mov $0, R32(w2)
mov (up,i,8), %rax
mul v0
add %rax, w0
mov w0, (rp,i,8)
adc %rdx, w1
mov (up,i,8), %rax
adc $0, R32(w2)
mul v1
add %rax, w1
adc %rdx, w2
mov 8(up,i,8), %rax
mul v0
mov $0, R32(w3)
add %rax, w1
adc %rdx, w2
adc $0, R32(w3)
mov 8(up,i,8), %rax
mul v1
add %rax, w2
mov w1, 8(rp,i,8)
adc %rdx, w3
mov $0, R32(w0)
mov 16(up,i,8), %rax
mul v0
add %rax, w2
mov 16(up,i,8), %rax
adc %rdx, w3
adc $0, R32(w0)
L(m2e2):mul v1
mov $0, R32(w1)
add %rax, w3
mov 24(up,i,8), %rax
mov w2, 16(rp,i,8)
adc %rdx, w0
add $4, i
js L(m2top2)
mul v0
add %rax, w3
mov I(-8(up),-8(up,i,8)), %rax
mov w3, I(-8(rp),-8(rp,i,8))
adc %rdx, w0
adc R32(w1), R32(w1)
mul v1
add %rax, w0
adc %rdx, w1
mov w0, I((rp),(rp,i,8))
mov w1, I(8(rp),8(rp,i,8))
add $-2, vn_param
jz L(ret2)
L(do_am2):
push %r15
push vn_param
L(olo2):
mov (vp), v0
mov 8(vp), v1
lea 16(vp), vp
lea 16(rp), rp
mov (up,un,8), %rax
lea -2(un), i
mul v0
mov %rax, X0
MOV( %rdx, X1, 32)
mov (up,un,8), %rax
mov (rp,un,8), w0
mul v1
mov %rax, w1
lea (%rdx), w2
mov 8(up,un,8), %rax
jmp L(lo2)
ALIGNx
L(am2top2):
mul v1
add w0, w1
adc %rax, w2
mov (up,i,8), %rax
MOV( %rdx, w3, 1)
adc $0, w3
mul v0
add w1, X1
mov X1, -8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 2)
adc $0, X1
mov (up,i,8), %rax
mul v1
MOV( %rdx, w0, 4)
mov (rp,i,8), w1
add w1, w2
adc %rax, w3
adc $0, w0
mov 8(up,i,8), %rax
mul v0
add w2, X0
adc %rax, X1
mov X0, (rp,i,8)
MOV( %rdx, X0, 8)
adc $0, X0
mov 8(up,i,8), %rax
mov 8(rp,i,8), w2
mul v1
add w2, w3
adc %rax, w0
MOV( %rdx, w1, 16)
adc $0, w1
mov 16(up,i,8), %rax
mul v0
add w3, X1
mov X1, 8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 32)
mov 16(rp,i,8), w3
adc $0, X1
mov 16(up,i,8), %rax
mul v1
add w3, w0
MOV( %rdx, w2, 64)
adc %rax, w1
mov 24(up,i,8), %rax
adc $0, w2
L(lo2): mul v0
add w0, X0
mov X0, 16(rp,i,8)
MOV( %rdx, X0, 128)
adc %rax, X1
mov 24(up,i,8), %rax
mov 24(rp,i,8), w0
adc $0, X0
add $4, i
jnc L(am2top2)
mul v1
add w0, w1
adc %rax, w2
adc Z(i,$0), %rdx
add w1, X1
adc Z(i,$0), X0
mov X1, I(-8(rp),-8(rp,i,8))
add w2, X0
mov X0, I((rp),(rp,i,8))
adc Z(i,$0), %rdx
mov %rdx, I(8(rp),8(rp,i,8))
addl $-2, vn
jnz L(olo2)
pop %rax
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
FUNC_EXIT()
ret
ALIGNx
L(m2top3):
mul v0
add %rax, w3
mov -8(up,i,8), %rax
mov w3, -8(rp,i,8)
adc %rdx, w0
adc $0, R32(w1)
mul v1
add %rax, w0
adc %rdx, w1
mov $0, R32(w2)
mov (up,i,8), %rax
mul v0
add %rax, w0
mov w0, (rp,i,8)
adc %rdx, w1
mov (up,i,8), %rax
adc $0, R32(w2)
mul v1
add %rax, w1
adc %rdx, w2
mov 8(up,i,8), %rax
mul v0
mov $0, R32(w3)
add %rax, w1
adc %rdx, w2
adc $0, R32(w3)
mov 8(up,i,8), %rax
L(m2e3):mul v1
add %rax, w2
mov w1, 8(rp,i,8)
adc %rdx, w3
mov $0, R32(w0)
mov 16(up,i,8), %rax
mul v0
add %rax, w2
mov 16(up,i,8), %rax
adc %rdx, w3
adc $0, R32(w0)
mul v1
mov $0, R32(w1)
add %rax, w3
mov 24(up,i,8), %rax
mov w2, 16(rp,i,8)
adc %rdx, w0
add $4, i
js L(m2top3)
mul v0
add %rax, w3
mov I(-8(up),-8(up,i,8)), %rax
mov w3, I(-8(rp),-8(rp,i,8))
adc %rdx, w0
adc $0, R32(w1)
mul v1
add %rax, w0
adc %rdx, w1
mov w0, I((rp),(rp,i,8))
mov w1, I(8(rp),8(rp,i,8))
add $-2, vn_param
jz L(ret2)
L(do_am3):
push %r15
push vn_param
L(olo3):
mov (vp), v0
mov 8(vp), v1
lea 16(vp), vp
lea 16(rp), rp
mov (up,un,8), %rax
lea -1(un), i
mul v0
mov %rax, X1
MOV( %rdx, X0, 8)
mov (up,un,8), %rax
mov (rp,un,8), w3
mul v1
mov %rax, w0
MOV( %rdx, w1, 16)
mov 8(up,un,8), %rax
jmp L(lo3)
ALIGNx
L(am2top3):
mul v1
add w0, w1
adc %rax, w2
mov (up,i,8), %rax
MOV( %rdx, w3, 1)
adc $0, w3
mul v0
add w1, X1
mov X1, -8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 2)
adc $0, X1
mov (up,i,8), %rax
mul v1
MOV( %rdx, w0, 4)
mov (rp,i,8), w1
add w1, w2
adc %rax, w3
adc $0, w0
mov 8(up,i,8), %rax
mul v0
add w2, X0
adc %rax, X1
mov X0, (rp,i,8)
MOV( %rdx, X0, 8)
adc $0, X0
mov 8(up,i,8), %rax
mov 8(rp,i,8), w2
mul v1
add w2, w3
adc %rax, w0
MOV( %rdx, w1, 16)
adc $0, w1
mov 16(up,i,8), %rax
L(lo3): mul v0
add w3, X1
mov X1, 8(rp,i,8)
adc %rax, X0
MOV( %rdx, X1, 32)
mov 16(rp,i,8), w3
adc $0, X1
mov 16(up,i,8), %rax
mul v1
add w3, w0
MOV( %rdx, w2, 64)
adc %rax, w1
mov 24(up,i,8), %rax
adc $0, w2
mul v0
add w0, X0
mov X0, 16(rp,i,8)
MOV( %rdx, X0, 128)
adc %rax, X1
mov 24(up,i,8), %rax
mov 24(rp,i,8), w0
adc $0, X0
add $4, i
jnc L(am2top3)
mul v1
add w0, w1
adc %rax, w2
adc Z(i,$0), %rdx
add w1, X1
adc Z(i,$0), X0
mov X1, I(-8(rp),-8(rp,i,8))
add w2, X0
mov X0, I((rp),(rp,i,8))
adc Z(i,$0), %rdx
mov %rdx, I(8(rp),8(rp,i,8))
addl $-2, vn
jnz L(olo3)
pop %rax
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
FUNC_EXIT()
ret
EPILOGUE()
CF_PROT