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159 lines
3.3 KiB
NASM
159 lines
3.3 KiB
NASM
dnl AMD64 mpn_rshift -- mpn right shift.
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dnl Copyright 2003, 2005, 2009 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 3 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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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 GNU MP Library. If not, see http://www.gnu.org/licenses/.
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include(`../config.m4')
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C cycles/limb
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C K8,K9: 2.375
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C K10: 2.375
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C P4: 8
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C P6-15 (Core2): 2.11
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C P6-28 (Atom): 5.75
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C INPUT PARAMETERS
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define(`rp', `%rdi')
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define(`up', `%rsi')
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define(`n', `%rdx')
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define(`cnt', `%rcx')
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ASM_START()
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TEXT
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ALIGN(32)
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PROLOGUE(mpn_rshift)
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neg R32(%rcx) C put rsh count in cl
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mov (up), %rax
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shl R8(%rcx), %rax C function return value
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neg R32(%rcx) C put lsh count in cl
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lea 1(n), R32(%r8)
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lea -8(up,n,8), up
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lea -8(rp,n,8), rp
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neg n
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and $3, R32(%r8)
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je L(rlx) C jump for n = 3, 7, 11, ...
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dec R32(%r8)
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jne L(1)
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C n = 4, 8, 12, ...
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mov 8(up,n,8), %r10
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shr R8(%rcx), %r10
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neg R32(%rcx) C put rsh count in cl
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mov 16(up,n,8), %r8
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shl R8(%rcx), %r8
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or %r8, %r10
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mov %r10, 8(rp,n,8)
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inc n
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jmp L(rll)
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L(1): dec R32(%r8)
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je L(1x) C jump for n = 1, 5, 9, 13, ...
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C n = 2, 6, 10, 16, ...
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mov 8(up,n,8), %r10
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shr R8(%rcx), %r10
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neg R32(%rcx) C put rsh count in cl
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mov 16(up,n,8), %r8
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shl R8(%rcx), %r8
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or %r8, %r10
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mov %r10, 8(rp,n,8)
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inc n
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neg R32(%rcx) C put lsh count in cl
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L(1x):
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cmp $-1, n
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je L(ast)
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mov 8(up,n,8), %r10
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shr R8(%rcx), %r10
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mov 16(up,n,8), %r11
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shr R8(%rcx), %r11
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neg R32(%rcx) C put rsh count in cl
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mov 16(up,n,8), %r8
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mov 24(up,n,8), %r9
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shl R8(%rcx), %r8
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or %r8, %r10
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shl R8(%rcx), %r9
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or %r9, %r11
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mov %r10, 8(rp,n,8)
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mov %r11, 16(rp,n,8)
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add $2, n
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L(rll): neg R32(%rcx) C put lsh count in cl
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L(rlx): mov 8(up,n,8), %r10
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shr R8(%rcx), %r10
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mov 16(up,n,8), %r11
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shr R8(%rcx), %r11
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add $4, n C 4
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jb L(end) C 2
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ALIGN(16)
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L(top):
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C finish stuff from lsh block
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neg R32(%rcx) C put rsh count in cl
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mov -16(up,n,8), %r8
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mov -8(up,n,8), %r9
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shl R8(%rcx), %r8
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or %r8, %r10
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shl R8(%rcx), %r9
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or %r9, %r11
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mov %r10, -24(rp,n,8)
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mov %r11, -16(rp,n,8)
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C start two new rsh
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mov (up,n,8), %r8
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mov 8(up,n,8), %r9
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shl R8(%rcx), %r8
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shl R8(%rcx), %r9
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C finish stuff from rsh block
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neg R32(%rcx) C put lsh count in cl
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mov -8(up,n,8), %r10
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mov 0(up,n,8), %r11
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shr R8(%rcx), %r10
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or %r10, %r8
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shr R8(%rcx), %r11
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or %r11, %r9
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mov %r8, -8(rp,n,8)
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mov %r9, 0(rp,n,8)
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C start two new lsh
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mov 8(up,n,8), %r10
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mov 16(up,n,8), %r11
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shr R8(%rcx), %r10
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shr R8(%rcx), %r11
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add $4, n
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jae L(top) C 2
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L(end):
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neg R32(%rcx) C put rsh count in cl
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mov -8(up), %r8
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shl R8(%rcx), %r8
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or %r8, %r10
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mov (up), %r9
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shl R8(%rcx), %r9
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or %r9, %r11
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mov %r10, -16(rp)
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mov %r11, -8(rp)
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neg R32(%rcx) C put lsh count in cl
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L(ast): mov (up), %r10
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shr R8(%rcx), %r10
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mov %r10, (rp)
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ret
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EPILOGUE()
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