3.4.5 winavr produces nice tidy code. Even the compares with 0 reduce to tight sbic/jmp pairs.
----------- Larry Barello www.barello.net | -----Original Message----- | From: [EMAIL PROTECTED] [mailto:avr-gcc- | [EMAIL PROTECTED] On Behalf Of James L. Evans | Sent: Tuesday, May 16, 2006 3:47 PM | To: avr-gcc-list@nongnu.org | Subject: [avr-gcc-list] Horrible code | | Could someone with a 4.1 version of the AVR-GCC compiler please compile | the following code (-Os) and see if it generates better code than the | horrible code (25 instructions) generated for Case 2 by version 3.4.3? | | Thanks, | | Jim Evans | | | #include <inttypes.h> | #include <avr/io.h> | | void test7(void) { | while (PINA & 0x40) PORTA = 0; // Case 1 | | while ((PINA & 0x40) == 0) PORTA = 0; // Case 2 | | while (!(PINA & 0x40)) PORTA = 0; // Case 3 | | uint8_t b; | while ((b = (PINA & 0x40)) == 0) PORTA = 0; // Case 4 | } | | | _______________________________________________ | AVR-GCC-list mailing list | AVR-GCC-list@nongnu.org | http://lists.nongnu.org/mailman/listinfo/avr-gcc-list _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
