underflow handled much more slowly in gcc than in icc

Solution Unverified - Updated -


  • Underflow in gcc is handled much more slowly in gcc than icc.
  • The solution is probably to take some ideas from projects like http://lipforge.ens-lyon.fr/www/crlibm/ and incorporate them into glibc.
  • Currently glibc's libm is derived from IBM Ultimate Precision Math Library which preserves the precision perfectly but does so at an immense cost in certain circumstances.


  • Red Hat Enterprise Linux 6

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