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1a59d1b8e0
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
38 lines
918 B
ArmAsm
38 lines
918 B
ArmAsm
;; SPDX-License-Identifier: GPL-2.0-or-later
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;; Copyright (C) 2010 Texas Instruments Incorporated
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;; Contributed by Mark Salter <msalter@redhat.com>.
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;;
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#include <linux/linkage.h>
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;; uint64_t __c6xabi_mpyll(uint64_t x, uint64_t y)
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;;
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;; 64x64 multiply
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;; First compute partial results using 32-bit parts of x and y:
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;;
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;; b63 b32 b31 b0
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;; -----------------------------
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;; | 1 | 0 |
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;; -----------------------------
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;;
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;; P0 = X0*Y0
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;; P1 = X0*Y1 + X1*Y0
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;; P2 = X1*Y1
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;;
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;; result = (P2 << 64) + (P1 << 32) + P0
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;;
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;; Since the result is also 64-bit, we can skip the P2 term.
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.text
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ENTRY(__c6xabi_mpyll)
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mpy32u .m1x A4,B4,A1:A0 ; X0*Y0
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b .s2 B3
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|| mpy32u .m2x B5,A4,B1:B0 ; X0*Y1 (don't need upper 32-bits)
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|| mpy32u .m1x A5,B4,A3:A2 ; X1*Y0 (don't need upper 32-bits)
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nop
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nop
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mv .s1 A0,A4
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add .l1x A2,B0,A5
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add .s1 A1,A5,A5
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ENDPROC(__c6xabi_mpyll)
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