109 lines
2.5 KiB
NASM
109 lines
2.5 KiB
NASM
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; mpn_sub_n
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; Copyright 2009 Jason Moxham
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; Windows Conversion Copyright 2008 Brian Gladman
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;
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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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;
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; ret mpn_sub_n(mp_ptr,mp_ptr,mp_ptr,mp_size_t)
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; (r9,rcx)=(rdx,rcx)-(r8,rcx) return rax=borrow
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%include "..\yasm_mac.inc"
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%define TR2 r10
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%define TR4 r10
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CPU Core2
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BITS 64
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LEAF_PROC mpn_sub_n
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movsxd rax, r9d
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mov r9, rcx
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mov rcx, rax
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and rax, 3
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sub rcx, rax
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lea r9, [r9+rcx*8]
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lea rdx, [rdx+rcx*8]
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lea r8, [r8+rcx*8]
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neg rcx
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cmp rcx, 0
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jz L_skiplp
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xalign 16
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L_lp:
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mov r10, [rdx+rcx*8]
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mov r11, [rdx+rcx*8+16]
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sbb r10, [r8+rcx*8]
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mov [r9+rcx*8], r10
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mov TR2, [rdx+rcx*8+8]
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sbb TR2, [r8+rcx*8+8]
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mov [r9+rcx*8+8], TR2
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lea rcx, [rcx+4]
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mov TR4, [rdx+rcx*8-8]
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sbb r11, [r8+rcx*8-16]
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sbb TR4, [r8+rcx*8-8]
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mov [r9+rcx*8-16], r11
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mov [r9+rcx*8-8], TR4
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jrcxz L_exitlp
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jmp L_lp
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L_exitlp:
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sbb rcx, rcx
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L_skiplp:
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cmp rax, 2
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ja L_case3
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jz L_case2
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jp L_case1
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L_case0:
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sub rax, rcx
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ret
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xalign 16
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L_case1:
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add rcx, rcx
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mov r10, [rdx]
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sbb r10, [r8]
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mov [r9], r10
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sbb rax, rax
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neg rax
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ret
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xalign 16
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L_case3:
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add rcx, rcx
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mov r10, [rdx]
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mov r11, [rdx+16]
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sbb r10, [r8]
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mov [r9], r10
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mov TR2, [rdx+8]
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sbb TR2, [r8+8]
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mov [r9+8], TR2
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sbb r11, [r8+16]
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mov [r9+16], r11
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sbb rax, rax
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neg rax
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ret
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xalign 16
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L_case2:
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add rcx, rcx
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mov r10, [rdx]
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sbb r10, [r8]
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mov [r9], r10
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mov TR2, [rdx+8]
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sbb TR2, [r8+8]
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mov [r9+8], TR2
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sbb rax, rax
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neg rax
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ret
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end
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