http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46080
--- Comment #2 from Vincent Lefèvre <vincent at vinc17 dot org> 2010-10-20 01:51:56 UTC --- Created attachment 22089 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22089 sh script to test sqrtf Similar problems can also be found with: printf ("%.60f\n%.60f\n%.60f\n", sqrtf(x), sqrtf(x), sqrtf(x)); I've found that every GCC version I could test was showing some incorrect behavior (but GCC 4.2.4 was the most consistent one). With the attached script, I get: -DSEP -O0 -O1 -O2 GCC 3.4.6 SSS SSS SDD SDD GCC 4.1.3 SSS SSS DSS DDS GCC 4.2.4 SSS SSS DDD DDD (x86) GCC 4.3.5 SSS SSS DSS DDD (ditto with GCC 4.3.2 on x86) GCC 4.4.5 DSS SSD DSS DDD where S means that one gets the result in single precision (as expected) and D means that one gets the result in double precision.
