diff options
Diffstat (limited to 'vendor/gmp-6.3.0/mpn/x86/p6/mode1o.asm')
-rw-r--r-- | vendor/gmp-6.3.0/mpn/x86/p6/mode1o.asm | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/vendor/gmp-6.3.0/mpn/x86/p6/mode1o.asm b/vendor/gmp-6.3.0/mpn/x86/p6/mode1o.asm new file mode 100644 index 0000000..7083195 --- /dev/null +++ b/vendor/gmp-6.3.0/mpn/x86/p6/mode1o.asm @@ -0,0 +1,170 @@ +dnl Intel P6 mpn_modexact_1_odd -- exact division style remainder. + +dnl Copyright 2000-2002, 2007 Free Software Foundation, Inc. + +dnl This file is part of the GNU MP Library. +dnl +dnl The GNU MP Library is free software; you can redistribute it and/or modify +dnl it under the terms of either: +dnl +dnl * the GNU Lesser General Public License as published by the Free +dnl Software Foundation; either version 3 of the License, or (at your +dnl option) any later version. +dnl +dnl or +dnl +dnl * the GNU General Public License as published by the Free Software +dnl Foundation; either version 2 of the License, or (at your option) any +dnl later version. +dnl +dnl or both in parallel, as here. +dnl +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 General Public License +dnl for more details. +dnl +dnl You should have received copies of the GNU General Public License and the +dnl GNU Lesser General Public License along with the GNU MP Library. If not, +dnl see https://www.gnu.org/licenses/. + +include(`../config.m4') + + +C P6: 10.0 cycles/limb + + +C mp_limb_t mpn_modexact_1_odd (mp_srcptr src, mp_size_t size, +C mp_limb_t divisor); +C mp_limb_t mpn_modexact_1c_odd (mp_srcptr src, mp_size_t size, +C mp_limb_t divisor, mp_limb_t carry); +C +C It's not worth skipping a step at the end when high<divisor since the main +C loop is only 10 cycles. + +defframe(PARAM_CARRY, 16) +defframe(PARAM_DIVISOR,12) +defframe(PARAM_SIZE, 8) +defframe(PARAM_SRC, 4) + +dnl Not enough room under modexact_1 to make these re-use the parameter +dnl space, unfortunately. +defframe(SAVE_EBX, -4) +defframe(SAVE_ESI, -8) +defframe(SAVE_EDI, -12) +deflit(STACK_SPACE, 12) + + TEXT + + ALIGN(16) +PROLOGUE(mpn_modexact_1c_odd) +deflit(`FRAME',0) + + movl PARAM_CARRY, %ecx + jmp L(start_1c) + +EPILOGUE() + + ALIGN(16) +PROLOGUE(mpn_modexact_1_odd) +deflit(`FRAME',0) + + xorl %ecx, %ecx +L(start_1c): + movl PARAM_DIVISOR, %eax + + subl $STACK_SPACE, %esp FRAME_subl_esp(STACK_SPACE) + + movl %esi, SAVE_ESI + movl PARAM_SRC, %esi + + shrl %eax C d/2 + movl %edi, SAVE_EDI + + andl $127, %eax + +ifdef(`PIC',` + LEA( binvert_limb_table, %edi) + movzbl (%eax,%edi), %edi C inv 8 bits +',` + movzbl binvert_limb_table(%eax), %edi C inv 8 bits +') + + xorl %edx, %edx C initial extra carry + leal (%edi,%edi), %eax C 2*inv + + imull %edi, %edi C inv*inv + + movl %ebx, SAVE_EBX + movl PARAM_SIZE, %ebx + + imull PARAM_DIVISOR, %edi C inv*inv*d + + subl %edi, %eax C inv = 2*inv - inv*inv*d + leal (%eax,%eax), %edi C 2*inv + + imull %eax, %eax C inv*inv + + imull PARAM_DIVISOR, %eax C inv*inv*d + + leal (%esi,%ebx,4), %esi C src end + negl %ebx C -size + + subl %eax, %edi C inv = 2*inv - inv*inv*d + + ASSERT(e,` C d*inv == 1 mod 2^GMP_LIMB_BITS + movl PARAM_DIVISOR, %eax + imull %edi, %eax + cmpl $1, %eax') + + +C The dependent chain here is +C +C subl %edx, %eax 1 +C imull %edi, %eax 4 +C mull PARAM_DIVISOR 5 +C ---- +C total 10 +C +C and this is the measured speed. No special scheduling is necessary, out +C of order execution hides the load latency. + +L(top): + C eax scratch (src limb) + C ebx counter, limbs, negative + C ecx carry bit, 0 or 1 + C edx carry limb, high of last product + C esi &src[size] + C edi inverse + C ebp + + movl (%esi,%ebx,4), %eax + subl %ecx, %eax + + sbbl %ecx, %ecx + subl %edx, %eax + + sbbl $0, %ecx + + imull %edi, %eax + + negl %ecx + + mull PARAM_DIVISOR + + incl %ebx + jnz L(top) + + + movl SAVE_ESI, %esi + leal (%ecx,%edx), %eax + + movl SAVE_EDI, %edi + + movl SAVE_EBX, %ebx + addl $STACK_SPACE, %esp + + ret + +EPILOGUE() +ASM_END() |