diff options
Diffstat (limited to 'rts/gmp/mpn/x86/diveby3.asm')
| -rw-r--r-- | rts/gmp/mpn/x86/diveby3.asm | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/rts/gmp/mpn/x86/diveby3.asm b/rts/gmp/mpn/x86/diveby3.asm deleted file mode 100644 index df879da9e1..0000000000 --- a/rts/gmp/mpn/x86/diveby3.asm +++ /dev/null @@ -1,115 +0,0 @@ -dnl x86 mpn_divexact_by3 -- mpn division by 3, expecting no remainder. - - -dnl Copyright (C) 2000 Free Software Foundation, Inc. -dnl -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 -dnl modify it under the terms of the GNU Lesser General Public License as -dnl published by the Free Software Foundation; either version 2.1 of the -dnl License, or (at your option) any later version. -dnl -dnl The GNU MP Library is distributed in the hope that it will be useful, -dnl but WITHOUT ANY WARRANTY; without even the implied warranty of -dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -dnl Lesser General Public License for more details. -dnl -dnl You should have received a copy of the GNU Lesser General Public -dnl License along with the GNU MP Library; see the file COPYING.LIB. If -dnl not, write to the Free Software Foundation, Inc., 59 Temple Place - -dnl Suite 330, Boston, MA 02111-1307, USA. - - -dnl The following all have their own optimized versions of this routine, -dnl but for reference the code here runs as follows. -dnl -dnl cycles/limb -dnl P54 18.0 -dnl P55 17.0 -dnl P6 14.5 -dnl K6 14.0 -dnl K7 10.0 - - -include(`../config.m4') - - -C mp_limb_t mpn_divexact_by3c (mp_ptr dst, mp_srcptr src, mp_size_t size, -C mp_limb_t carry); - -defframe(PARAM_CARRY,16) -defframe(PARAM_SIZE, 12) -defframe(PARAM_SRC, 8) -defframe(PARAM_DST, 4) - -dnl multiplicative inverse of 3, modulo 2^32 -deflit(INVERSE_3, 0xAAAAAAAB) - -dnl ceil(b/3) and ceil(b*2/3) where b=2^32 -deflit(ONE_THIRD_CEIL, 0x55555556) -deflit(TWO_THIRDS_CEIL, 0xAAAAAAAB) - - .text - ALIGN(8) - -PROLOGUE(mpn_divexact_by3c) -deflit(`FRAME',0) - - movl PARAM_SRC, %ecx - pushl %ebp FRAME_pushl() - - movl PARAM_SIZE, %ebp - pushl %edi FRAME_pushl() - - movl PARAM_DST, %edi - pushl %esi FRAME_pushl() - - movl $INVERSE_3, %esi - pushl %ebx FRAME_pushl() - - leal (%ecx,%ebp,4), %ecx - movl PARAM_CARRY, %ebx - - leal (%edi,%ebp,4), %edi - negl %ebp - - - ALIGN(8) -L(top): - C eax scratch, low product - C ebx carry limb (0 to 3) - C ecx &src[size] - C edx scratch, high product - C esi multiplier - C edi &dst[size] - C ebp counter, limbs, negative - - movl (%ecx,%ebp,4), %eax - - subl %ebx, %eax - - setc %bl - - imull %esi - - cmpl $ONE_THIRD_CEIL, %eax - movl %eax, (%edi,%ebp,4) - - sbbl $-1, %ebx C +1 if eax>=ceil(b/3) - cmpl $TWO_THIRDS_CEIL, %eax - - sbbl $-1, %ebx C +1 if eax>=ceil(b*2/3) - incl %ebp - - jnz L(top) - - - movl %ebx, %eax - popl %ebx - popl %esi - popl %edi - popl %ebp - ret - -EPILOGUE() |