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ff4ff35918
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118 lines
2.5 KiB
NASM
118 lines
2.5 KiB
NASM
dnl PowerPC-64 mpn_modexact_1_odd -- mpn by limb exact remainder.
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dnl Copyright 2006 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 cycles/limb
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C POWER3/PPC630 13-19
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C POWER4/PPC970 16
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C POWER5 16
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C POWER6 ?
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C POWER7 12
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C TODO
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C * Check if n=1 code is really an improvement. It probably isn't.
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C * Make more similar to dive_1.asm.
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C INPUT PARAMETERS
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define(`up', `r3')
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define(`n', `r4')
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define(`d', `r5')
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define(`cy', `r6')
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ASM_START()
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EXTERN(binvert_limb_table)
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PROLOGUE(mpn_modexact_1c_odd,toc)
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addic. n, n, -1 C set carry as side effect
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ld r8, 0(up)
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bne cr0, L(2)
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cmpld cr7, r6, r8
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bge cr7, L(4)
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subf r8, r6, r8
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divdu r3, r8, d
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mulld r3, r3, d
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subf. r3, r3, r8
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beqlr cr0
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subf r3, r3, d
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blr
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L(4): subf r3, r8, r6
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divdu r8, r3, d
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mulld r8, r8, d
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subf r3, r8, r3
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blr
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L(2): LEA( r7, binvert_limb_table)
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rldicl r9, d, 63, 57
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mtctr n
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lbzx r0, r7, r9
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mulld r7, r0, r0
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sldi r0, r0, 1
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mulld r7, d, r7
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subf r0, r7, r0
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mulld r9, r0, r0
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sldi r0, r0, 1
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mulld r9, d, r9
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subf r0, r9, r0
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mulld r7, r0, r0
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sldi r0, r0, 1
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mulld r7, d, r7
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subf r9, r7, r0
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ALIGN(16)
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L(loop):
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subfe r0, r6, r8
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ld r8, 8(up)
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addi up, up, 8
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mulld r0, r9, r0
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mulhdu r6, r0, d
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bdnz L(loop)
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cmpld cr7, d, r8
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blt cr7, L(10)
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subfe r0, r0, r0
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subf r6, r0, r6
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cmpld cr7, r6, r8
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subf r3, r8, r6
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bgelr cr7
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add r3, d, r3
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blr
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L(10): subfe r0, r6, r8
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mulld r0, r9, r0
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mulhdu r3, r0, d
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blr
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EPILOGUE()
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ASM_END()
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