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113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
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/**
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 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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#ifndef MATH_AVR_H
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#define MATH_AVR_H
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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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// r26 to store 0
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// r27 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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// B0 A0 are bits 24-39 and are the returned value
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// C1 B1 A1 is longIn1
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// D2 C2 B2 A2 is longIn2
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//
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#define MultiU24X32toH16(intRes, longIn1, longIn2) \
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asm volatile ( \
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"clr r26 \n\t" \
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"mul %A1, %B2 \n\t" \
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"mov r27, r1 \n\t" \
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"mul %B1, %C2 \n\t" \
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"movw %A0, r0 \n\t" \
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"mul %C1, %C2 \n\t" \
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"add %B0, r0 \n\t" \
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"mul %C1, %B2 \n\t" \
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"add %A0, r0 \n\t" \
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"adc %B0, r1 \n\t" \
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"mul %A1, %C2 \n\t" \
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"add r27, r0 \n\t" \
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"adc %A0, r1 \n\t" \
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"adc %B0, r26 \n\t" \
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"mul %B1, %B2 \n\t" \
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"add r27, r0 \n\t" \
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"adc %A0, r1 \n\t" \
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"adc %B0, r26 \n\t" \
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"mul %C1, %A2 \n\t" \
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"add r27, r0 \n\t" \
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"adc %A0, r1 \n\t" \
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"adc %B0, r26 \n\t" \
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"mul %B1, %A2 \n\t" \
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"add r27, r1 \n\t" \
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"adc %A0, r26 \n\t" \
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"adc %B0, r26 \n\t" \
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"lsr r27 \n\t" \
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"adc %A0, r26 \n\t" \
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"adc %B0, r26 \n\t" \
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"mul %D2, %A1 \n\t" \
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"add %A0, r0 \n\t" \
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"adc %B0, r1 \n\t" \
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"mul %D2, %B1 \n\t" \
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"add %B0, r0 \n\t" \
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"clr r1 \n\t" \
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: \
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"=&r" (intRes) \
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: \
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"d" (longIn1), \
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"d" (longIn2) \
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: \
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"r26" , "r27" \
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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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#define MultiU16X8toH16(intRes, charIn1, intIn2) \
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asm volatile ( \
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"clr r26 \n\t" \
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"mul %A1, %B2 \n\t" \
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"movw %A0, r0 \n\t" \
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"mul %A1, %A2 \n\t" \
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"add %A0, r1 \n\t" \
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"adc %B0, r26 \n\t" \
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"lsr r0 \n\t" \
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"adc %A0, r26 \n\t" \
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"adc %B0, r26 \n\t" \
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"clr r1 \n\t" \
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: \
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"=&r" (intRes) \
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: \
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"d" (charIn1), \
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"d" (intIn2) \
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: \
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"r26" \
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)
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#endif
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