> -----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 Georg-Johann Lay > Sent: Monday, March 23, 2009 1:49 PM > To: avr-gcc-list@nongnu.org > Subject: Re: [avr-gcc-list] Bug in *rotlsi3 insns? > > Georg-Johann Lay schrieb: > > Hi, im just browsing avr.md in trunk and stumbled over some > new patterns > > that implement rotlsi3. > > > > IMHO, they are buggy. But I have no testcase to make it explicit. > > Consider this test case: > > unsigned long rotl (int dummy, unsigned long x) > { > return (x << 8) | (x >> 24); > } > > Compile with, e.g. > avr-gcc -mmcu=atmega8 -S -Os -fno-split-wide-types > to get > > rotl: > /* prologue: function */ > /* frame size = 0 */ > mov r22,r23 > mov r23,r20 > mov r24,r21 > mov r25,r22 > /* epilogue start */ > ret > > This will map 0x33221100 to 0x33110033 instead of to 0x22110033
What do you get if you drop -fno-split-wide-types? And what version is this on? _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
