dnl AMD64 mpn_mul_1 optimised for Intel Broadwell.
dnl Copyright 2015 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 n/a
C AMD K10 n/a
C AMD bull n/a
C AMD pile n/a
C AMD steam n/a
C AMD bobcat n/a
C AMD jaguar n/a
C Intel P4 n/a
C Intel core2 n/a
C Intel NHM n/a
C Intel SBR n/a
C Intel IBR n/a
C Intel HWL 1.68
C Intel BWL 1.69
C Intel atom n/a
C Intel SLM n/a
C VIA nano n/a
C The loop of this code is the result of running a code generation and
C optimisation tool suite written by David Harvey and Torbjorn Granlund.
C TODO
C * Put an initial mulx before switching, targeting some free registers.
C * Tune feed-in code.
C * Trim nop execution after L(f2).
C * Port to DOS64, not forgetting nop execution.
define(`rp', `%rdi') C rcx
define(`up', `%rsi') C rdx
define(`n_param', `%rdx') C r8
define(`v0_param',`%rcx') C r9
define(`n', `%rcx')
dnl ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
dnl IFDOS(` define(`up', ``%rsi'') ') dnl
dnl IFDOS(` define(`rp', ``%rcx'') ') dnl
dnl IFDOS(` define(`vl', ``%r9'') ') dnl
dnl IFDOS(` define(`r9', ``rdi'') ') dnl
dnl IFDOS(` define(`n', ``%r8'') ') dnl
dnl IFDOS(` define(`r8', ``r11'') ') dnl
ASM_START()
TEXT
ALIGN(32)
PROLOGUE(mpn_mul_1)
mov v0_param, %r10
mov n_param, n
mov R32(n_param), R32(%r8)
shr $3, n
and $7, R32(%r8) C clear OF, CF as side-effect
mov %r10, %rdx
lea L(tab)(%rip), %r10
ifdef(`PIC',
` movslq (%r10,%r8,4), %r8
lea (%r8, %r10), %r10
jmp *%r10
',`
jmp *(%r10,%r8,8)
')
JUMPTABSECT
ALIGN(8)
L(tab): JMPENT( L(f0), L(tab))
JMPENT( L(f1), L(tab))
JMPENT( L(f2), L(tab))
JMPENT( L(f3), L(tab))
JMPENT( L(f4), L(tab))
JMPENT( L(f5), L(tab))
JMPENT( L(f6), L(tab))
JMPENT( L(f7), L(tab))
TEXT
L(f0): mulx( (up), %r10, %r8)
lea 56(up), up
lea -8(rp), rp
jmp L(b0)
L(f3): mulx( (up), %r9, %rax)
lea 16(up), up
lea 16(rp), rp
inc n
jmp L(b3)
L(f4): mulx( (up), %r10, %r8)
lea 24(up), up
lea 24(rp), rp
inc n
jmp L(b4)
L(f5): mulx( (up), %r9, %rax)
lea 32(up), up
lea 32(rp), rp
inc n
jmp L(b5)
L(f6): mulx( (up), %r10, %r8)
lea 40(up), up
lea 40(rp), rp
inc n
jmp L(b6)
L(f7): mulx( (up), %r9, %rax)
lea 48(up), up
lea 48(rp), rp
inc n
jmp L(b7)
L(f1): mulx( (up), %r9, %rax)
test n, n
jnz L(b1)
L(1): mov %r9, (rp)
ret
L(f2): mulx( (up), %r10, %r8)
lea 8(up), up
lea 8(rp), rp
mulx( (up), %r9, %rax)
test n, n
jz L(end)
ALIGN(32)
L(top): mov %r10, -8(rp)
adc %r8, %r9
L(b1): mulx( 8,(up), %r10, %r8)
adc %rax, %r10
lea 64(up), up
mov %r9, (rp)
L(b0): mov %r10, 8(rp)
mulx( -48,(up), %r9, %rax)
lea 64(rp), rp
adc %r8, %r9
L(b7): mulx( -40,(up), %r10, %r8)
mov %r9, -48(rp)
adc %rax, %r10
L(b6): mov %r10, -40(rp)
mulx( -32,(up), %r9, %rax)
adc %r8, %r9
L(b5): mulx( -24,(up), %r10, %r8)
mov %r9, -32(rp)
adc %rax, %r10
L(b4): mulx( -16,(up), %r9, %rax)
mov %r10, -24(rp)
adc %r8, %r9
L(b3): mulx( -8,(up), %r10, %r8)
adc %rax, %r10
mov %r9, -16(rp)
dec n
mulx( (up), %r9, %rax)
jnz L(top)
L(end): mov %r10, -8(rp)
adc %r8, %r9
mov %r9, (rp)
adc %rcx, %rax
ret
EPILOGUE()
ASM_END()