| ;; SPDX-License-Identifier: GPL-2.0-or-later | |
| ;; Copyright (C) 2010 Texas Instruments Incorporated | |
| ;; Contributed by Mark Salter <msalter@redhat.com>. | |
| ;; | |
| #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) |