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dnl PowerPC-32 mpn_mul_1 -- Multiply a limb vector with a limb and store
dnl the result in a second limb vector.
dnl Copyright (C) 1995, 1997, 2000 Free Software 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 by
dnl the Free Software Foundation; either version 2.1 of the License, or (at your
dnl 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; see the file COPYING.LIB. If not, write to
dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
dnl MA 02111-1307, USA.
dnl INPUT PARAMETERS
dnl res_ptr r3
dnl s1_ptr r4
dnl size r5
dnl s2_limb r6
dnl This is optimized for the PPC604 but it runs decently even on PPC601. It
dnl has not been tested on a PPC603 since I don't have access to any such
dnl machines.
include(`../config.m4')
ASM_START()
PROLOGUE(mpn_mul_1)
mtctr r5
addi r3,r3,-4 C adjust res_ptr, it's offset before it's used
li r12,0 C clear upper product reg
addic r0,r0,0 C clear cy
C Start software pipeline
lwz r8,0(r4)
bdz .Lend3
stmw r30,-8(r1) C save registers we are supposed to preserve
lwzu r9,4(r4)
mullw r11,r8,r6
mulhwu r0,r8,r6
bdz .Lend1
C Software pipelined main loop
.Loop: lwz r8,4(r4)
mullw r10,r9,r6
adde r30,r11,r12
mulhwu r12,r9,r6
stw r30,4(r3)
bdz .Lend2
lwzu r9,8(r4)
mullw r11,r8,r6
adde r31,r10,r0
mulhwu r0,r8,r6
stwu r31,8(r3)
bdnz .Loop
C Finish software pipeline
.Lend1: mullw r10,r9,r6
adde r30,r11,r12
mulhwu r12,r9,r6
stw r30,4(r3)
adde r31,r10,r0
stwu r31,8(r3)
addze r3,r12
lmw r30,-8(r1) C restore registers from stack
blr
.Lend2: mullw r11,r8,r6
adde r31,r10,r0
mulhwu r0,r8,r6
stwu r31,8(r3)
adde r30,r11,r12
stw r30,4(r3)
addze r3,r0
lmw r30,-8(r1) C restore registers from stack
blr
.Lend3: mullw r11,r8,r6
stw r11,4(r3)
mulhwu r3,r8,r6
blr
EPILOGUE(mpn_mul_1)
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