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dnl AMD64 mpn_addmul_1 optimised for Intel Broadwell.
dnl Copyright 2015, 2017 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 bd1 n/a
C AMD bd2 n/a
C AMD bd3 n/a
C AMD bd4 ?
C AMD zen1 ?
C AMD zen2 ?
C AMD zen3 1.5
C AMD bt1 n/a
C AMD bt2 n/a
C Intel P4 n/a
C Intel PNR n/a
C Intel NHM n/a
C Intel SBR n/a
C Intel IBR n/a
C Intel HWL n/a
C Intel BWL 1.67 1.74
C Intel SKL 1.63 1.71
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 * For DOS64, fix 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')
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_addmul_1)
FUNC_ENTRY(4)
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 -8(up), up
lea -8(rp), rp
lea -1(n), n
jmp L(b0)
L(f3): mulx( (up), %r9, %rax)
lea 16(up), up
lea -48(rp), rp
jmp L(b3)
L(f4): mulx( (up), %r10, %r8)
lea 24(up), up
lea -40(rp), rp
jmp L(b4)
L(f5): mulx( (up), %r9, %rax)
lea 32(up), up
lea -32(rp), rp
jmp L(b5)
L(f6): mulx( (up), %r10, %r8)
lea 40(up), up
lea -24(rp), rp
jmp L(b6)
L(f1): mulx( (up), %r9, %rax)
jrcxz L(1)
jmp L(b1)
L(1): add (rp), %r9
mov %r9, (rp)
adc %rcx, %rax C relies on rcx = 0
FUNC_EXIT()
ret
L(end): adox( (rp), %r9)
mov %r9, (rp)
adox( %rcx, %rax) C relies on rcx = 0
adc %rcx, %rax C relies on rcx = 0
FUNC_EXIT()
ret
ifdef(`PIC',
` nop;nop;nop;nop',
` nop;nop;nop;nop;nop;nop;nop;nop;nop;nop;nop')
L(f2): mulx( (up), %r10, %r8)
lea 8(up), up
lea 8(rp), rp
mulx( (up), %r9, %rax)
ALIGN(32)
L(top): adox( -8,(rp), %r10)
adcx( %r8, %r9)
mov %r10, -8(rp)
jrcxz L(end)
L(b1): mulx( 8,(up), %r10, %r8)
adox( (rp), %r9)
lea -1(n), n
mov %r9, (rp)
adcx( %rax, %r10)
L(b0): mulx( 16,(up), %r9, %rax)
adcx( %r8, %r9)
adox( 8,(rp), %r10)
mov %r10, 8(rp)
L(b7): mulx( 24,(up), %r10, %r8)
lea 64(up), up
adcx( %rax, %r10)
adox( 16,(rp), %r9)
mov %r9, 16(rp)
L(b6): mulx( -32,(up), %r9, %rax)
adox( 24,(rp), %r10)
adcx( %r8, %r9)
mov %r10, 24(rp)
L(b5): mulx( -24,(up), %r10, %r8)
adcx( %rax, %r10)
adox( 32,(rp), %r9)
mov %r9, 32(rp)
L(b4): mulx( -16,(up), %r9, %rax)
adox( 40,(rp), %r10)
adcx( %r8, %r9)
mov %r10, 40(rp)
L(b3): adox( 48,(rp), %r9)
mulx( -8,(up), %r10, %r8)
mov %r9, 48(rp)
lea 64(rp), rp
adcx( %rax, %r10)
mulx( (up), %r9, %rax)
jmp L(top)
L(f7): mulx( (up), %r9, %rax)
lea -16(up), up
lea -16(rp), rp
jmp L(b7)
EPILOGUE()
ASM_END()
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