| ;; Copyright (C) 2010 Texas Instruments Incorporated |
| ;; Contributed by Mark Salter <msalter@redhat.com>. |
| ;; |
| ;; This program is free software; you can redistribute it and/or modify |
| ;; it under the terms of the GNU General Public License as published by |
| ;; the Free Software Foundation; either version 2 of the License, or |
| ;; (at your option) any later version. |
| ;; |
| ;; This program is distributed in the hope that it will be useful, |
| ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| ;; GNU General Public License for more details. |
| ;; |
| ;; You should have received a copy of the GNU General Public License |
| ;; along with this program; if not, write to the Free Software |
| ;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| |
| #include <linux/linkage.h> |
| |
| ;; uint64_t __c6xabi_mpyll(uint64_t x, uint64_t y) |
| ;; |
| ;; 64x64 multiply |
| ;; First compute partial results using 32-bit parts of x and y: |
| ;; |
| ;; b63 b32 b31 b0 |
| ;; ----------------------------- |
| ;; | 1 | 0 | |
| ;; ----------------------------- |
| ;; |
| ;; P0 = X0*Y0 |
| ;; P1 = X0*Y1 + X1*Y0 |
| ;; P2 = X1*Y1 |
| ;; |
| ;; result = (P2 << 64) + (P1 << 32) + P0 |
| ;; |
| ;; Since the result is also 64-bit, we can skip the P2 term. |
| |
| .text |
| ENTRY(__c6xabi_mpyll) |
| mpy32u .m1x A4,B4,A1:A0 ; X0*Y0 |
| b .s2 B3 |
| || mpy32u .m2x B5,A4,B1:B0 ; X0*Y1 (don't need upper 32-bits) |
| || mpy32u .m1x A5,B4,A3:A2 ; X1*Y0 (don't need upper 32-bits) |
| nop |
| nop |
| mv .s1 A0,A4 |
| add .l1x A2,B0,A5 |
| add .s1 A1,A5,A5 |
| ENDPROC(__c6xabi_mpyll) |