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 -
C AMD K10 -
C AMD bull -
C AMD pile -
C AMD steam -
C AMD excavator -
C AMD bobcat -
C AMD jaguar -
C Intel P4 -
C Intel core2 -
C Intel NHM -
C Intel SBR -
C Intel IBR -
C Intel HWL 1.70
C Intel BWL 1.51
C Intel SKL 1.52
C Intel atom -
C Intel SLM -
C VIA nano -
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()
