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dnl PowerPC-32 mpn_addmul_1 -- Multiply a limb vector with a limb and add the
dnl result to a second limb vector.
dnl Copyright 1995, 1997, 1998, 2000, 2001, 2002, 2003, 2005 Free Software
dnl Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C 603e: ?
C 604e: 6.75
C 75x (G3): 8.7-14.3
C 7400,7410 (G4): 8.7-14.3
C 744x,745x (G4+): 9.5
C power4/ppc970: 6.25
C power5: 6.25
C INPUT PARAMETERS
C rp r3
C up r4
C n r5
C vl r6
C This is optimized for the PPC604. It has not been tuned for other
C PowerPC processors.
C
C Loop Analysis for the 604:
C 12 mem insn
C 8 serializing insn
C 8 int multiply
C 25 int reg write
C 9 int ops (8 of which serialize)
C
C The multiply insns need 16 cycles/4limb.
C The integer register writes will need 13 cycles/4limb.
C All-in-all, it should be possible to get to 4 or 5 cycles/limb on PPC604,
C but that will require some clever FPNOPS and BNOPS for exact
C issue control.
ASM_START()
PROLOGUE(mpn_addmul_1)
cmpwi cr0,r5,9 C more than 9 limbs?
bgt cr0,L(big) C branch if more than 9 limbs
mtctr r5
lwz r0,0(r4)
mullw r7,r0,r6
mulhwu r10,r0,r6
lwz r9,0(r3)
addc r8,r7,r9
addi r3,r3,-4
bdz L(end)
L(loop):
lwzu r0,4(r4)
stwu r8,4(r3)
mullw r8,r0,r6
adde r7,r8,r10
mulhwu r10,r0,r6
lwz r9,4(r3)
addze r10,r10
addc r8,r7,r9
bdnz L(loop)
L(end): stw r8,4(r3)
addze r3,r10
blr
L(big): stmw r30,-32(r1)
addi r5,r5,-1
srwi r0,r5,2
mtctr r0
lwz r7,0(r4)
mullw r8,r7,r6
mulhwu r0,r7,r6
lwz r7,0(r3)
addc r8,r8,r7
stw r8,0(r3)
L(loopU):
lwz r7,4(r4)
lwz r12,8(r4)
lwz r30,12(r4)
lwzu r31,16(r4)
mullw r8,r7,r6
mullw r9,r12,r6
mullw r10,r30,r6
mullw r11,r31,r6
adde r8,r8,r0 C add cy_limb
mulhwu r0,r7,r6
lwz r7,4(r3)
adde r9,r9,r0
mulhwu r0,r12,r6
lwz r12,8(r3)
adde r10,r10,r0
mulhwu r0,r30,r6
lwz r30,12(r3)
adde r11,r11,r0
mulhwu r0,r31,r6
lwz r31,16(r3)
addze r0,r0 C new cy_limb
addc r8,r8,r7
stw r8,4(r3)
adde r9,r9,r12
stw r9,8(r3)
adde r10,r10,r30
stw r10,12(r3)
adde r11,r11,r31
stwu r11,16(r3)
bdnz L(loopU)
andi. r31,r5,3
mtctr r31
beq cr0,L(endx)
L(loopE):
lwzu r7,4(r4)
mullw r8,r7,r6
adde r8,r8,r0 C add cy_limb
mulhwu r0,r7,r6
lwz r7,4(r3)
addze r0,r0 C new cy_limb
addc r8,r8,r7
stwu r8,4(r3)
bdnz L(loopE)
L(endx):
addze r3,r0
lmw r30,-32(r1)
blr
EPILOGUE(mpn_addmul_1)
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