124 lines
3.0 KiB
NASM
124 lines
3.0 KiB
NASM
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; AMD64 mpn_rsh1sub_n
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; Copyright 2009 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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;
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; (rdi,rcx)=((rsi,rcx)-(rdx,rcx))/2
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; return bottom bit of difference
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; subtraction treated as two compliment
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%include "..\yasm_mac.inc"
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%define reg_save_list rbx, rsi, rdi, r12
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CPU Athlon64
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BITS 64
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FRAME_PROC mpn_rsh1sub_n, 0, reg_save_list
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movsxd rax, r9d
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lea rdi, [rcx+rax*8-32]
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lea rsi, [rdx+rax*8-32]
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lea rdx, [r8+rax*8-32]
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mov rcx, rax
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mov r8, 4
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sub r8, rcx
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mov r12, [rsi+r8*8]
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sub r12, [rdx+r8*8]
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sbb rbx, rbx
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mov rax, r12
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and rax, 1
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cmp r8, 0
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jge L_skiplp
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L_lp:
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mov r11, [rsi+r8*8+32]
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mov r10, [rsi+r8*8+24]
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add rbx, 1
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mov rcx, [rsi+r8*8+8]
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mov r9, [rsi+r8*8+16]
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sbb rcx, [rdx+r8*8+8]
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sbb r9, [rdx+r8*8+16]
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sbb r10, [rdx+r8*8+24]
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sbb r11, [rdx+r8*8+32]
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sbb rbx, rbx
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bt r11, 0
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rcr r10, 1
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rcr r9, 1
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rcr rcx, 1
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rcr r12, 1
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mov [rdi+r8*8], r12
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mov [rdi+r8*8+8], rcx
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mov [rdi+r8*8+16], r9
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mov [rdi+r8*8+24], r10
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mov r12, r11
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add r8, 4
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jnc L_lp
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L_skiplp:
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cmp r8, 2
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ja L_case0
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jz L_case1
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jp L_case2
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L_case3:
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mov r10, [rsi+r8*8+24]
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add rbx, 1
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mov rcx, [rsi+r8*8+8]
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mov r9, [rsi+r8*8+16]
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sbb rcx, [rdx+r8*8+8]
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sbb r9, [rdx+r8*8+16]
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sbb r10, [rdx+r8*8+24]
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rcr r10, 1
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rcr r9, 1
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rcr rcx, 1
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rcr r12, 1
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mov [rdi+r8*8], r12
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mov [rdi+r8*8+8], rcx
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mov [rdi+r8*8+16], r9
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mov [rdi+r8*8+24], r10
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jmp L_xit
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xalign 16
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L_case2:
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add rbx, 1
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mov rcx, [rsi+r8*8+8]
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mov r9, [rsi+r8*8+16]
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sbb rcx, [rdx+r8*8+8]
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sbb r9, [rdx+r8*8+16]
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rcr r9, 1
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rcr rcx, 1
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rcr r12, 1
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mov [rdi+r8*8], r12
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mov [rdi+r8*8+8], rcx
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mov [rdi+r8*8+16], r9
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jmp L_xit
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xalign 16
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L_case1:
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add rbx, 1
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mov rcx, [rsi+r8*8+8]
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sbb rcx, [rdx+r8*8+8]
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rcr rcx, 1
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rcr r12, 1
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mov [rdi+r8*8], r12
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mov [rdi+r8*8+8], rcx
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jmp L_xit
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xalign 16
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L_case0:
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add rbx, 1
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rcr r12, 1
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mov [rdi+r8*8], r12
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L_xit:
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END_PROC reg_save_list
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end
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