diff options
Diffstat (limited to 'vendor/gmp-6.3.0/mpn/alpha/ev67/popcount.asm')
-rw-r--r-- | vendor/gmp-6.3.0/mpn/alpha/ev67/popcount.asm | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/vendor/gmp-6.3.0/mpn/alpha/ev67/popcount.asm b/vendor/gmp-6.3.0/mpn/alpha/ev67/popcount.asm new file mode 100644 index 0000000..049c1cd --- /dev/null +++ b/vendor/gmp-6.3.0/mpn/alpha/ev67/popcount.asm @@ -0,0 +1,101 @@ +dnl Alpha ev67 mpn_popcount -- mpn bit population count. + +dnl Copyright 2003, 2005 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 ev67: 1.5 cycles/limb + + +C unsigned long mpn_popcount (mp_srcptr src, mp_size_t size); +C +C This schedule seems necessary for the full 1.5 c/l, the IQ can't quite hide +C all latencies, the addq's must be deferred to the next iteration. +C +C Since we need just 3 instructions per limb, further unrolling could approach +C 1.0 c/l. +C +C The main loop processes two limbs at a time. An odd size is handled by +C processing src[0] at the start. If the size is even that result is +C discarded, and src[0] is repeated by the main loop. +C + +ASM_START() +PROLOGUE(mpn_popcount) + + C r16 src + C r17 size + + ldq r0, 0(r16) C L0 src[0] + and r17, 1, r8 C U1 1 if size odd + srl r17, 1, r17 C U0 size, limb pairs + + s8addq r8, r16, r16 C L1 src++ if size odd + ctpop r0, r0 C U0 + beq r17, L(one) C U1 if size==1 + + cmoveq r8, r31, r0 C L discard first limb if size even + clr r3 C L + + clr r4 C L + unop C U + unop C L + unop C U + + + ALIGN(16) +L(top): + C r0 total accumulating + C r3 pop 0 + C r4 pop 1 + C r16 src, incrementing + C r17 size, decrementing + + ldq r1, 0(r16) C L + ldq r2, 8(r16) C L + lda r16, 16(r16) C U + lda r17, -1(r17) C U + + addq r0, r3, r0 C L + addq r0, r4, r0 C L + ctpop r1, r3 C U0 + ctpop r2, r4 C U0 + + ldl r31, 512(r16) C L prefetch + bne r17, L(top) C U + + + addq r0, r3, r0 C L + addq r0, r4, r0 C U +L(one): + ret r31, (r26), 1 C L0 + +EPILOGUE() +ASM_END() |