114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#pragma once
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/**
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* Optimized math functions for AVR
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*/
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// intRes = longIn1 * longIn2 >> 24
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// uses:
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// A[tmp] to store 0
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// B[tmp] to store bits 16-23 of the 48bit result. The top bit is used to round the two byte result.
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// note that the lower two bytes and the upper byte of the 48bit result are not calculated.
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// this can cause the result to be out by one as the lower bytes may cause carries into the upper ones.
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// B A are bits 24-39 and are the returned value
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// C B A is longIn1
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// D C B A is longIn2
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//
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static FORCE_INLINE uint16_t MultiU24X32toH16(uint32_t longIn1, uint32_t longIn2) {
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uint8_t tmp1;
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uint8_t tmp2;
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uint16_t intRes;
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__asm__ __volatile__(
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A("clr %[tmp1]")
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A("mul %A[longIn1], %B[longIn2]")
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A("mov %[tmp2], r1")
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A("mul %B[longIn1], %C[longIn2]")
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A("movw %A[intRes], r0")
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A("mul %C[longIn1], %C[longIn2]")
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A("add %B[intRes], r0")
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A("mul %C[longIn1], %B[longIn2]")
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A("add %A[intRes], r0")
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A("adc %B[intRes], r1")
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A("mul %A[longIn1], %C[longIn2]")
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A("add %[tmp2], r0")
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A("adc %A[intRes], r1")
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A("adc %B[intRes], %[tmp1]")
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A("mul %B[longIn1], %B[longIn2]")
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A("add %[tmp2], r0")
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A("adc %A[intRes], r1")
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A("adc %B[intRes], %[tmp1]")
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A("mul %C[longIn1], %A[longIn2]")
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A("add %[tmp2], r0")
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A("adc %A[intRes], r1")
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A("adc %B[intRes], %[tmp1]")
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A("mul %B[longIn1], %A[longIn2]")
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A("add %[tmp2], r1")
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A("adc %A[intRes], %[tmp1]")
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A("adc %B[intRes], %[tmp1]")
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A("lsr %[tmp2]")
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A("adc %A[intRes], %[tmp1]")
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A("adc %B[intRes], %[tmp1]")
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A("mul %D[longIn2], %A[longIn1]")
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A("add %A[intRes], r0")
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A("adc %B[intRes], r1")
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A("mul %D[longIn2], %B[longIn1]")
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A("add %B[intRes], r0")
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A("clr r1")
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: [intRes] "=&r" (intRes),
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[tmp1] "=&r" (tmp1),
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[tmp2] "=&r" (tmp2)
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: [longIn1] "d" (longIn1),
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[longIn2] "d" (longIn2)
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: "cc"
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);
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return intRes;
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}
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// intRes = intIn1 * intIn2 >> 16
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// uses:
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// r26 to store 0
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// r27 to store the byte 1 of the 24 bit result
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static FORCE_INLINE uint16_t MultiU16X8toH16(uint8_t charIn1, uint16_t intIn2) {
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uint8_t tmp;
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uint16_t intRes;
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__asm__ __volatile__ (
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A("clr %[tmp]")
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A("mul %[charIn1], %B[intIn2]")
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A("movw %A[intRes], r0")
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A("mul %[charIn1], %A[intIn2]")
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A("add %A[intRes], r1")
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A("adc %B[intRes], %[tmp]")
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A("lsr r0")
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A("adc %A[intRes], %[tmp]")
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A("adc %B[intRes], %[tmp]")
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A("clr r1")
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: [intRes] "=&r" (intRes),
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[tmp] "=&r" (tmp)
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: [charIn1] "d" (charIn1),
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[intIn2] "d" (intIn2)
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: "cc"
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);
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return intRes;
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}
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