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64 lines
1.7 KiB
NASM
64 lines
1.7 KiB
NASM
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dnl ARM/Thumb mpn_add_n.
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dnl Copyright 1997, 2000, 2012 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl
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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 either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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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 General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://www.gnu.org/licenses/.
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include(`../config.m4')
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C INPUT PARAMETERS
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define(`rp', r0)
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define(`up', r1)
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define(`vp', r2)
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define(`n', r3)
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ASM_START()
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.thumb
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PROLOGUE(mpn_add_nc)
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push {r4, r5, r6}
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ldr r6, [sp, #12] C init carry save register
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sub r6, #1
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b L(top)
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EPILOGUE()
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PROLOGUE(mpn_add_n)
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push {r4, r5, r6}
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neg r6, n C init carry save register
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L(top): ldmia up!, {r4} C load next limb from S1
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cmp n, r6 C tricky carry restore
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ldmia vp!, {r5} C load next limb from S2
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adc r4, r5
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stmia rp!, {r4} C store result limb to RES
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sbc r6, r6 C save negated carry
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sub n, #1
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bne L(top)
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add r0, r6, #1
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pop {r4, r5, r6}
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bx lr
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EPILOGUE()
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