74 lines
2.0 KiB
NASM
74 lines
2.0 KiB
NASM
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dnl PowerPC-64 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 1999, 2000, 2001, 2003, 2005 Free Software Foundation, 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 POWER3/PPC630: ?
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C POWER4/PPC970: 16
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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 v r6,r7 or r7,r8
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ASM_START()
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PROLOGUE(mpn_submul_1)
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ifdef(`BROKEN_LONGLONG_PARAM',
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` rldimi r8, r7, 32,0 C assemble vlimb from separate 32-bit arguments
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mr r6, r8
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',`
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rldimi r7, r6, 32,0 C assemble vlimb from separate 32-bit arguments
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mr r6, r7
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')
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li r7, 0 C cy_limb = 0
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mtctr r5
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addic r0, r0, 0
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addi r3, r3, -8
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addi r4, r4, -8
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L(oop): ldu r0, 8(r4)
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mulld r9, r0, r6
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adde r12, r9, r7 C add old high limb and new low limb
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srdi r5, r9, 32
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srdi r11, r7, 32
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adde r5, r5, r11 C add high limb parts, set cy
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mulhdu r7, r0, r6
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addze r7, r7
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ld r10, 8(r3)
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subfc r9, r12, r10
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srdi r5, r12, 32
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srdi r11, r10, 32
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subfe r5, r5, r11 C subtract high limb parts, set cy
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stdu r9, 8(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(oop)
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addze r4, r7
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srdi r3, r4, 32
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blr
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EPILOGUE()
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