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author | Kevin Ryde <user42@zip.com.au> | 2001-11-02 00:52:56 +0100 |
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committer | Kevin Ryde <user42@zip.com.au> | 2001-11-02 00:52:56 +0100 |
commit | f7349743ef6d0dca00f2b039b67dc7bfd98fdcb5 (patch) | |
tree | f04d7bdf0d0d778adfb67dfac61e01e327e773e6 /mpn | |
parent | 1c253604cd43921af2635daca3b9d637b9adcdf8 (diff) | |
download | gmp-f7349743ef6d0dca00f2b039b67dc7bfd98fdcb5.tar.gz |
* mpn/x86/pentium4/mmx/popham.asm: New file.
Diffstat (limited to 'mpn')
-rw-r--r-- | mpn/x86/pentium4/mmx/popham.asm | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/mpn/x86/pentium4/mmx/popham.asm b/mpn/x86/pentium4/mmx/popham.asm new file mode 100644 index 000000000..708391143 --- /dev/null +++ b/mpn/x86/pentium4/mmx/popham.asm @@ -0,0 +1,188 @@ +dnl Intel Pentium 4 mpn_popcount, mpn_hamdist -- population count and +dnl hamming distance. +dnl +dnl P4: popcount 8.5 cycles/limb +dnl hamdist 9.5 cycles/limb + +dnl Copyright 2000, 2001 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. + +include(`../config.m4') + + +C unsigned long mpn_popcount (mp_srcptr src, mp_size_t size); +C unsigned long mpn_hamdist (mp_srcptr src, mp_srcptr src2, mp_size_t size); +C +C Loading with unaligned movq's costs an extra 1 c/l and hence is avoided. +C Two movd's and a punpckldq seems to be the same speed as an aligned movq, +C and using them saves fiddling about with alignment testing on entry. +C +C For popcount there's 13 mmx instructions in the loop, so perhaps 6.5 c/l +C might be possible, but 8.5 c/l relying on out-of-order execution is +C already quite reasonable. + +ifdef(`OPERATION_popcount',, +`ifdef(`OPERATION_hamdist',, +`m4_error(`Need OPERATION_popcount or OPERATION_hamdist defined +')')') + +define(HAM, +m4_assert_numargs(1) +`ifdef(`OPERATION_hamdist',`$1')') + +define(POP, +m4_assert_numargs(1) +`ifdef(`OPERATION_popcount',`$1')') + +HAM(` +defframe(PARAM_SIZE, 12) +defframe(PARAM_SRC2, 8) +defframe(PARAM_SRC, 4) +define(M4_function,mpn_hamdist) +') +POP(` +defframe(PARAM_SIZE, 8) +defframe(PARAM_SRC, 4) +define(M4_function,mpn_popcount) +') + +MULFUNC_PROLOGUE(mpn_popcount mpn_hamdist) + + +ifdef(`PIC',,` + dnl non-PIC + RODATA + ALIGN(8) +LF(M4_function,rodata_AAAAAAAAAAAAAAAA): + .long 0xAAAAAAAA + .long 0xAAAAAAAA +LF(M4_function,rodata_3333333333333333): + .long 0x33333333 + .long 0x33333333 +LF(M4_function,rodata_0F0F0F0F0F0F0F0F): + .long 0x0F0F0F0F + .long 0x0F0F0F0F +') + + TEXT + ALIGN(16) + +PROLOGUE(M4_function) +deflit(`FRAME',0) + + movl PARAM_SIZE, %ecx + movl PARAM_SRC, %eax + +ifdef(`PIC',` + movl $0xAAAAAAAA, %edx + movd %edx, %mm7 + punpckldq %mm7, %mm7 + + movl $0x33333333, %edx + movd %edx, %mm6 + punpckldq %mm6, %mm6 + + movl $0x0F0F0F0F, %edx + movd %edx, %mm5 + punpckldq %mm5, %mm5 + +HAM(` movl PARAM_SRC2, %edx') + +',` + dnl non-PIC +HAM(` movl PARAM_SRC2, %edx') + movq L(rodata_AAAAAAAAAAAAAAAA), %mm7 + movq L(rodata_3333333333333333), %mm6 + movq L(rodata_0F0F0F0F0F0F0F0F), %mm5 +') + + pxor %mm4, %mm4 C zero + pxor %mm0, %mm0 C total + + subl $1, %ecx + ja L(top) + +L(last): + movd (%eax,%ecx,4), %mm1 C src high limb +HAM(` movd (%edx,%ecx,4), %mm2 + pxor %mm2, %mm1 +') + jmp L(loaded) + + +L(top): + C eax src + C ebx + C ecx counter, size-1 to 2 or 1, inclusive + C edx [hamdist] src2 + C + C mm0 total (low dword) + C mm1 (scratch) + C mm2 (scratch) + C mm3 + C mm4 0x0000000000000000 + C mm5 0x0F0F0F0F0F0F0F0F + C mm6 0x3333333333333333 + C mm7 0xAAAAAAAAAAAAAAAA + + movd (%eax), %mm1 + movd 4(%eax), %mm2 + punpckldq %mm2, %mm1 + addl $8, %eax + +HAM(` movd (%edx), %mm2 + movd 4(%edx), %mm3 + punpckldq %mm3, %mm2 + pxor %mm2, %mm1 + addl $8, %edx +') + +L(loaded): + movq %mm7, %mm2 + pand %mm1, %mm2 + psrlq $1, %mm2 + psubd %mm2, %mm1 C bit pairs + + movq %mm6, %mm2 + pand %mm1, %mm2 + psrlq $2, %mm1 + pand %mm6, %mm1 + paddd %mm2, %mm1 C nibbles + + movq %mm5, %mm2 + pand %mm1, %mm2 + psrlq $4, %mm1 + pand %mm5, %mm1 + paddd %mm2, %mm1 C bytes + + psadbw( %mm4, %mm1) + paddd %mm1, %mm0 C to total + + subl $2, %ecx + jg L(top) + + C ecx is 0 or -1 representing respectively 1 or 0 further limbs + jz L(last) + + + movd %mm0, %eax + emms + ret + +EPILOGUE() |