2009-03-05 12:50:57 -05:00
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; AMD64 mpn_sublsh1_n
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; Copyright 2008 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 version 2.1 of the License, or (at
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; your option) any later version.
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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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; (rdi, rcx) = (rsi, rcx) - (rdx, rcx)<<1
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; rax = borrow
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%include 'yasm_mac.inc'
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BITS 64
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GLOBAL_FUNC mpn_sublsh1_n
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lea rsi, [rsi+rcx*8]
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lea rdx, [rdx+rcx*8]
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lea rdi, [rdi+rcx*8]
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neg rcx
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xor r9, r9
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xor rax, rax
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test rcx, 3
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jz next
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lp1:
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mov r10, [rsi+rcx*8]
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add r9, 1
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sbb r10, [rdx+rcx*8]
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sbb r9, r9
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add rax, 1
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sbb r10, [rdx+rcx*8]
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sbb rax, rax
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mov [rdi+rcx*8], r10
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inc rcx
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test rcx, 3
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jnz lp1
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next:
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cmp rcx, 0
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jz end
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push r15
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push r14
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push r13
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push r12
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push rbx
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align 16
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lp:
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mov r10, [rsi+rcx*8]
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mov rbx, [rsi+rcx*8+8]
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mov r11, [rsi+rcx*8+16]
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mov r8, [rsi+rcx*8+24]
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mov r12, [rdx+rcx*8]
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mov r13, [rdx+rcx*8+8]
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mov r14, [rdx+rcx*8+16]
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mov r15, [rdx+rcx*8+24]
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add r9, 1
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sbb r10, r12
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sbb rbx, r13
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sbb r11, r14
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sbb r8, r15
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sbb r9, r9
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add rax, 1
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sbb r10, r12
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sbb rbx, r13
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sbb r11, r14
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sbb r8, r15
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sbb rax, rax
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mov [rdi+rcx*8], r10
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mov [rdi+rcx*8+8], rbx
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mov [rdi+rcx*8+16], r11
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mov [rdi+rcx*8+24], r8
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add rcx, 4
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jnz lp
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pop rbx
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pop r12
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pop r13
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pop r14
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pop r15
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end:
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add rax, r9
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neg rax
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ret
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