[Bug c/85661] double comparison illegally statically reduced
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85661 Andrew Pinski changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #3 from Andrew Pinski --- See bug 323. *** This bug has been marked as a duplicate of bug 323 ***
[Bug c/85661] double comparison illegally statically reduced
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85661 --- Comment #2 from manuel.serrano at inria dot fr --- Dear Jakub, Thank you very much for your useful answer. I was indeed ignorant of the -fexcess-precision=fast option and as you suggested "-msse2 -mfpmath=sse" solves the problem. I'm still puzzled why inserting a dummy printf changes the behaviour of the double equality test. Is that expected?
[Bug c/85661] double comparison illegally statically reduced
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85661 Jakub Jelinek changed: What|Removed |Added CC||jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek --- If this is on i?86 32-bit, then most likely you just aren't taking into account the extended precision and the default -fexcess-precision=fast mode. So, either if you want excess precision, but require the C rules (and are using C), you need to use -fexcess-precision=standard (default in strict C std modes), or if you don't want excess precision, make sure you have SSE2 or later hw and use -msse2 -mfpmath=sse. In any case, that is a user error rather than compiler bug.
