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Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium/mode1o.asm')
-rw-r--r-- | Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium/mode1o.asm | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium/mode1o.asm b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium/mode1o.asm new file mode 100644 index 00000000000..eb2790e1a08 --- /dev/null +++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium/mode1o.asm @@ -0,0 +1,266 @@ +dnl Intel Pentium mpn_modexact_1_odd -- exact division style remainder. + +dnl Copyright 2000-2002 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 P5: 23.0 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 There seems no way to pair up the two lone instructions in the main loop. +C +C The special case for size==1 saves about 20 cycles (non-PIC), making it +C the same as mpn_mod_1, and in fact making modexact faster than mod_1 at +C all sizes. +C +C Alternatives: +C +C Using mmx for the multiplies might be possible, with pmullw and pmulhw +C having just 3 cycle latencies, but carry bit handling would probably be +C complicated. + +defframe(PARAM_CARRY, 16) +defframe(PARAM_DIVISOR,12) +defframe(PARAM_SIZE, 8) +defframe(PARAM_SRC, 4) + +dnl re-using parameter space +define(VAR_INVERSE,`PARAM_SIZE') + + TEXT + + ALIGN(16) +PROLOGUE(mpn_modexact_1c_odd) +deflit(`FRAME',0) + + movl PARAM_DIVISOR, %eax + movl PARAM_CARRY, %edx + + jmp L(start_1c) + +EPILOGUE() + + ALIGN(16) +PROLOGUE(mpn_modexact_1_odd) +deflit(`FRAME',0) + + movl PARAM_DIVISOR, %eax + xorl %edx, %edx C carry + +L(start_1c): + +ifdef(`PIC',` + call L(here) FRAME_pushl() +L(here): + + shrl %eax C d/2 + movl (%esp), %ecx C eip + + addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ecx + movl %ebx, (%esp) C push ebx + + andl $127, %eax + movl PARAM_SIZE, %ebx + + movl binvert_limb_table@GOT(%ecx), %ecx + subl $2, %ebx + + movb (%eax,%ecx), %cl C inv 8 bits + jc L(one_limb) + +',` +dnl non-PIC + shrl %eax C d/2 + pushl %ebx FRAME_pushl() + + movl PARAM_SIZE, %ebx + andl $127, %eax + + subl $2, %ebx + jc L(one_limb) + + movb binvert_limb_table(%eax), %cl C inv 8 bits +') + + movl %ecx, %eax + addl %ecx, %ecx C 2*inv + + imull %eax, %eax C inv*inv + + imull PARAM_DIVISOR, %eax C inv*inv*d + + subl %eax, %ecx C inv = 2*inv - inv*inv*d + + movl %ecx, %eax + addl %ecx, %ecx C 2*inv + + imull %eax, %eax C inv*inv + + imull PARAM_DIVISOR, %eax C inv*inv*d + + subl %eax, %ecx C inv = 2*inv - inv*inv*d + pushl %esi FRAME_pushl() + + ASSERT(e,` C d*inv == 1 mod 2^GMP_LIMB_BITS + movl %ecx, %eax + imull PARAM_DIVISOR, %eax + cmpl $1, %eax') + + movl PARAM_SRC, %esi + movl %ecx, VAR_INVERSE + + movl (%esi), %eax C src[0] + leal 4(%esi,%ebx,4), %esi C &src[size-1] + + xorl $-1, %ebx C -(size-1) + ASSERT(nz) + jmp L(entry) + + +C The use of VAR_INVERSE means only a store is needed for that value, rather +C than a push and pop of say %edi. + + ALIGN(16) +L(top): + C eax scratch, low product + C ebx counter, limbs, negative + C ecx carry bit + C edx scratch, high product + C esi &src[size-1] + C edi + C ebp + + mull PARAM_DIVISOR C h:dummy = q*d + + movl (%esi,%ebx,4), %eax C src[i] + subl %ecx, %edx C h -= -c + +L(entry): + subl %edx, %eax C s = src[i] - h + + sbbl %ecx, %ecx C new -c (0 or -1) + + imull VAR_INVERSE, %eax C q = s*i + + incl %ebx + jnz L(top) + + + mull PARAM_DIVISOR + + movl (%esi), %eax C src high + subl %ecx, %edx C h -= -c + + cmpl PARAM_DIVISOR, %eax + + jbe L(skip_last) +deflit(FRAME_LAST,FRAME) + + + subl %edx, %eax C s = src[i] - h + popl %esi FRAME_popl() + + sbbl %ecx, %ecx C c (0 or -1) + popl %ebx FRAME_popl() + + imull VAR_INVERSE, %eax C q = s*i + + mull PARAM_DIVISOR C h:dummy = q*d + + movl %edx, %eax + + subl %ecx, %eax + + ret + + +C When high<divisor can skip last step. + +L(skip_last): +deflit(`FRAME',FRAME_LAST) + C eax src high + C ebx + C ecx + C edx r + C esi + + subl %eax, %edx C r-s + popl %esi FRAME_popl() + + sbbl %eax, %eax C -1 if underflow + movl PARAM_DIVISOR, %ebx + + andl %ebx, %eax C divisor if underflow + popl %ebx FRAME_popl() + + addl %edx, %eax C addback if underflow + + ret + + +C Special case for size==1 using a division for r = c-a mod d. +C Could look for a-c<d and save a division sometimes, but that doesn't seem +C worth bothering about. + +L(one_limb): +deflit(`FRAME',4) + C eax + C ebx size-2 (==-1) + C ecx + C edx carry + C esi src end + C edi + C ebp + + movl %edx, %eax + movl PARAM_SRC, %edx + + movl PARAM_DIVISOR, %ecx + popl %ebx FRAME_popl() + + subl (%edx), %eax C c-a + + sbbl %edx, %edx + decl %ecx C d-1 + + andl %ecx, %edx C b*d+c-a if c<a, or c-a if c>=a + + divl PARAM_DIVISOR + + movl %edx, %eax + + ret + +EPILOGUE() |