137 lines
2.6 KiB
NASM
137 lines
2.6 KiB
NASM
dnl mpn_popcount
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dnl Copyright 2009 Jason Moxham
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dnl This file is part of the MPIR Library.
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dnl The MPIR Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The MPIR Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the MPIR Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C ret mpn_popcount(mp_ptr,mp_size_t)
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C rax rdi, rsi
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ASM_START()
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PROLOGUE(mpn_popcount)
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push %r12
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push %rbp
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push %rbx
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mov $0x5555555555555555,%r8
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mov $0x3333333333333333,%r9
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mov $0x0f0f0f0f0f0f0f0f,%r10
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mov $0x0101010101010101,%r11
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mov $0,%rax
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sub $2,%rsi
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jc skip
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mov 8(%rdi,%rsi,8),%rcx
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or 8(%rdi,%rsi,8),%rcx
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mov (%rdi,%rsi,8),%r12
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or (%rdi,%rsi,8),%r12
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sub $2,%rsi
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jc skiplp
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ALIGN(16)
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lp:
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mov %rcx,%rbp
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shr $1,%rcx
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and %r8,%rcx
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sub %rcx,%rbp
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mov %rbp,%rcx
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shr $2,%rbp
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and %r9,%rcx
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and %r9,%rbp
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add %rcx,%rbp
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mov %r12,%rbx
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shr $1,%r12
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and %r8,%r12
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sub %r12,%rbx
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mov 8(%rdi,%rsi,8),%rcx
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mov %rbx,%r12
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shr $2,%rbx
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and %r9,%r12
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or 8(%rdi,%rsi,8),%rcx
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and %r9,%rbx
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add %r12,%rbx
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add %rbp,%rbx
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mov %rbx,%rdx
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mov (%rdi,%rsi,8),%r12
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or (%rdi,%rsi,8),%r12
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shr $4,%rbx
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and %r10,%rdx
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and %r10,%rbx
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add %rbx,%rdx
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imul %r11,%rdx
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shr $56,%rdx
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add %rdx,%rax
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sub $2,%rsi
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jnc lp
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skiplp:
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mov %rcx,%rbp
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shr $1,%rcx
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and %r8,%rcx
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sub %rcx,%rbp
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mov %rbp,%rcx
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shr $2,%rbp
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and %r9,%rcx
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and %r9,%rbp
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add %rcx,%rbp
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mov %r12,%rbx
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shr $1,%r12
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and %r8,%r12
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sub %r12,%rbx
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mov %rbx,%r12
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shr $2,%rbx
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and %r9,%r12
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and %r9,%rbx
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add %r12,%rbx
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add %rbp,%rbx
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mov %rbx,%rdx
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shr $4,%rbx
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and %r10,%rdx
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and %r10,%rbx
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add %rbx,%rdx
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imul %r11,%rdx
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shr $56,%rdx
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add %rdx,%rax
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skip: cmp $-2,%rsi
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jz case0
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case1: mov 8(%rdi,%rsi,8),%rcx
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or 8(%rdi,%rsi,8),%rcx
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mov %rcx,%rbp
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shr $1,%rcx
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and %r8,%rcx
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sub %rcx,%rbp
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mov %rbp,%rcx
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shr $2,%rbp
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and %r9,%rcx
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and %r9,%rbp
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add %rcx,%rbp
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mov %rbp,%rdx
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shr $4,%rbp
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add %rbp,%rdx
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and %r10,%rdx
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imul %r11,%rdx
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shr $56,%rdx
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add %rdx,%rax
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case0: pop %rbx
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pop %rbp
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pop %r12
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ret
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EPILOGUE()
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