71 lines
1.8 KiB
NASM
71 lines
1.8 KiB
NASM
; PROLOGUE(mpn_popcount)
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; AMD64 mpn_popcount
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; Copyright 2009 Jason Moxham
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; This file is part of the MPIR Library.
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; The MPIR Library is free software; you can redistribute it and/or modify
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; it under the terms of the GNU Lesser General Public License as published
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; by the Free Software Foundation; either verdxon 2.1 of the License, or (at
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; your option) any later verdxon.
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; The MPIR Library is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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; License for more details.
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; You should have received a copy of the GNU Lesser General Public License
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; along with the MPIR Library; see the file COPYING.LIB. If not, write
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; to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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; Boston, MA 02110-1301, USA.
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; mpn_limb_t mpn_popcount(mp_ptr,mp_size_t)
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; rax rdi, rsi
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; eax rcx, rdx
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%include 'yasm_mac.inc'
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CPU nehalem
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BITS 64
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LEAF_PROC mpn_popcount
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mov r8, 5
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lea rcx, [rcx+rdx*8-40]
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xor eax, eax
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sub r8, rdx
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jnc .1
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xalign 16
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.0:
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popcnt r9, [rcx+r8*8]
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popcnt r10, [rcx+r8*8+8]
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popcnt r11, [rcx+r8*8+16]
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popcnt rdx, [rcx+r8*8+24]
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add rax, r9
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add rax, rdx
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add rax, r10
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popcnt r9, [rcx+r8*8+32]
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popcnt r10, [rcx+r8*8+40]
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add rax, r9
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add rax, r11
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add rax, r10
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add r8, 6
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jnc .0
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.1:
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lea rdx, [rel .2]
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lea r8, [r8+r8*8]
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add rdx, r8
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jmp rdx
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.2:
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nop
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popcnt r9, [rcx]
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add rax, r9
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.3:
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popcnt r10, [rcx+8]
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add rax, r10
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.4: popcnt r11, [rcx+16]
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add rax, r11
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.5: popcnt rdx, [rcx+24]
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add rax, rdx
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.6: popcnt r9, [rcx+32]
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add rax, r9
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.7: ret
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end
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