[Bug target/30652] SSE expansion is missing for isinf() and other fpclassify functions

[rth at gcc dot gnu dot org]

------- Comment #2 from rth at gcc dot gnu dot org  2007-02-01 00:28 -------
The generic implementation, including for SSE, is 

  isgreater (abs(f), FLT_MAX)

For isfinite, use islessequal instead.  For isnan, one can use 

  isunordered(f, f)

For isnormal, it'd be

  isgreaterequal(abs(f), FLT_MIN) & islessequal(abs(f), FLT_MAX)

which is less likely to be friendly to inline.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30652