[PATCH] D31561: cmath: Skip Libc for integral types in isinf, etc.

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.

For std::isinf, the standard requires effectively calling isinf as
double from Libc for integral types.  But integral types are never
infinite; we don't need to call Libc to return false.

      

Also short-circuit other functions where Libc won't have interesting
answers: signbit, fpclassify, isfinite, isnan, and isnormal.

      

I added correctness tests for integral types since we're no longer
deferring to Libc.


https://reviews.llvm.org/D31561

Files:
  libcxx/include/math.h
  libcxx/test/std/numerics/c.math/cmath.pass.cpp

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