tree 901fe8402cb0b6a210d902a808e8285c6ef8dcff
parent ec1722e8d4e7efc8a6e913a06104874d83c7983b
author Tim Peters <tim.peters@gmail.com> 971331025 +0000
committer Tim Peters <tim.peters@gmail.com> 971331025 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4018028

Stop raising OverflowError on underflows reported by libm (errno==ERANGE and
libm result is 0).  Cautiously add a few libm exception test cases:
1. That exp(-huge) returns 0 without exception.
2. That exp(+huge) triggers OverflowError.
3. That sqrt(-1) raises ValueError specifically (apparently under glibc linked
   with -lieee, it was raising OverflowError due to an accident of the way
   mathmodule.c's CHECK() macro happened to deal with Infs and NaNs under gcc).