62 lines
1.9 KiB
ActionScript
62 lines
1.9 KiB
ActionScript
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; AMD64 mpn_submul_1 -- Multiply a limb vector with a limb and subtract the
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; result from a second limb vector.
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;
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; Copyright 2004 Free Software Foundation, Inc.
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;
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; Copyright 2008 William Hart
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;
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; This file is part of the MPIR Library.
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;
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; The MPIR Library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Lesser General Public License as
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; published by the Free Software Foundation; either version 2.1 of the
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; License, or (at your option) any later version.
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;
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; The MPIR Library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; Lesser General Public License for more details.
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;
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; You should have received a copy of the GNU Lesser General Public
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; License along with the MPIR Library; see the file COPYING.LIB. If
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; not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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; Fifth Floor, Boston, MA 02110-1301, USA.
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;
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; cycles/limb
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; Hammer: 4.7
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;
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;
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; INPUT PARAMETERS
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; rp rdi
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; up rsi
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; n rdx
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; vl rcx
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%include 'yasm_mac.inc'
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BITS 64
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GLOBAL_FUNC mpn_submul_1
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mov r11, rdx
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lea rsi, [rsi+r11*8]
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lea rdi, [rdi+r11*8]
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neg r11
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xor r8d, r8d
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align 8 ; minimal alignment for claimed speed
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loop1:
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mov rax, [rsi+r11*8]
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mov r10, [rdi+r11*8] ; load limb from rp
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mul rcx ; multiply
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sub r10, r8 ; subtract any previous high limb (stored in r8)
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mov r8d, 0 ; clear r8 again
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adc r8d, r8d ; put any borrow from this iteration in r8
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sub r10, rax ; subtract low limb of product
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adc r8, rdx ; add high limb and any borrow to r8 for next iteration
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mov [rdi+r11*8], r10 ; store low limb
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inc r11
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jne loop1
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mov rax, r8
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ret
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