139 lines
2.9 KiB
NASM
139 lines
2.9 KiB
NASM
dnl PowerPC-32 mpn_submul_1 -- Multiply a limb vector with a limb and subtract
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dnl the result from a second limb vector.
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dnl Copyright 1995, 1997, 1998, 2000, 2002, 2005 Free Software Foundation,
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dnl Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C cycles/limb
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C 603e: ?
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C 604e: 7.5
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C 75x (G3): 9.3-15
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C 7400,7410 (G4): 9.3-15
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C 744x,745x (G4+): 10.5
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C power4/ppc970: 6.75
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C power5: 6.5
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C INPUT PARAMETERS
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C rp r3
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C up r4
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C n r5
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C vl r6
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C This is optimized for the PPC604. See addmul_1.asm for additional comments.
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ASM_START()
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PROLOGUE(mpn_submul_1)
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cmpwi cr0,r5,9 C more than 9 limbs?
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bgt cr0,L(big) C branch if more than 9 limbs
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mtctr r5
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lwz r0,0(r4)
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mullw r7,r0,r6
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mulhwu r10,r0,r6
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lwz r9,0(r3)
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subfc r8,r7,r9
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addc r7,r7,r8 C invert cy (r7 is junk)
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addi r3,r3,-4
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bdz L(end)
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L(loop):
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lwzu r0,4(r4)
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stwu r8,4(r3)
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mullw r8,r0,r6
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adde r7,r8,r10
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mulhwu r10,r0,r6
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lwz r9,4(r3)
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addze r10,r10
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subfc r8,r7,r9
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addc r7,r7,r8 C invert cy (r7 is junk)
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bdnz L(loop)
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L(end): stw r8,4(r3)
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addze r3,r10
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blr
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L(big): stmw r30,-32(r1)
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addi r5,r5,-1
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srwi r0,r5,2
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mtctr r0
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lwz r7,0(r4)
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mullw r8,r7,r6
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mulhwu r0,r7,r6
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lwz r7,0(r3)
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subfc r7,r8,r7
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addc r8,r8,r7
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stw r7,0(r3)
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L(loopU):
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lwz r7,4(r4)
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lwz r12,8(r4)
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lwz r30,12(r4)
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lwzu r31,16(r4)
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mullw r8,r7,r6
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mullw r9,r12,r6
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mullw r10,r30,r6
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mullw r11,r31,r6
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adde r8,r8,r0 C add cy_limb
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mulhwu r0,r7,r6
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lwz r7,4(r3)
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adde r9,r9,r0
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mulhwu r0,r12,r6
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lwz r12,8(r3)
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adde r10,r10,r0
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mulhwu r0,r30,r6
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lwz r30,12(r3)
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adde r11,r11,r0
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mulhwu r0,r31,r6
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lwz r31,16(r3)
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addze r0,r0 C new cy_limb
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subfc r7,r8,r7
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stw r7,4(r3)
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subfe r12,r9,r12
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stw r12,8(r3)
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subfe r30,r10,r30
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stw r30,12(r3)
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subfe r31,r11,r31
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stwu r31,16(r3)
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subfe r11,r11,r11 C invert ...
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addic r11,r11,1 C ... carry
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bdnz L(loopU)
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andi. r31,r5,3
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mtctr r31
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beq cr0,L(endx)
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L(loopE):
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lwzu r7,4(r4)
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mullw r8,r7,r6
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adde r8,r8,r0 C add cy_limb
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mulhwu r0,r7,r6
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lwz r7,4(r3)
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addze r0,r0 C new cy_limb
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subfc r7,r8,r7
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addc r8,r8,r7
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stwu r7,4(r3)
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bdnz L(loopE)
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L(endx):
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addze r3,r0
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lmw r30,-32(r1)
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blr
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EPILOGUE(mpn_submul_1)
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