> -----Original Message----- > From: > avr-gcc-list-bounces+eric.weddington=atmel....@nongnu.org > [mailto:avr-gcc-list-bounces+eric.weddington=atmel....@nongnu. > org] On Behalf Of Thomas D. Dean > Sent: Monday, May 04, 2009 4:37 PM > To: avr-gcc-list@nongnu.org > Subject: [avr-gcc-list] Using in/out Instructions with ATmega128 > > I have > # avr-gcc --version > avr-gcc (GCC) 4.3.2 > Copyright (C) 2008 Free Software Foundation, Inc. > ... > > I want to use the ATmega128 and in/out instructions for > registers below > 0x40. > > # avr-gcc -mmcu=atmega128 -c -o 4x40-lcd.o xxx.c > # avr-gcc -mmcu=atmega128 4x40-lcd.o -o xxx.elf -lc > # avr-objdump -d xxx.elf > ... > 804: a2 e3 ldi r26, 0x32 ; 50 > 806: b0 e0 ldi r27, 0x00 ; 0 > 808: e2 e3 ldi r30, 0x32 ; 50 > 80a: f0 e0 ldi r31, 0x00 ; 0 > 80c: 80 81 ld r24, Z > 80e: 8f 70 andi r24, 0x0F ; 15 > 810: 80 62 ori r24, 0x20 ; 32 > 812: 8c 93 st X, r24 > ... > > This can be done with four instructions, in, andi, ori, and, > out. And, > 6 fewer clocks.
Where is the source code that corresponds to the above assembly? _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list