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| author | Mikael Pettersson <[email protected]> | 2016-04-17 20:02:28 +0200 |
|---|---|---|
| committer | Lukas Larsson <[email protected]> | 2016-04-26 10:28:22 +0200 |
| commit | 0127f930e6aa2abc95ec4a95c9d5638d7e9bd512 (patch) | |
| tree | 3629899b02f9eb9a1855ffcaa9a886f4a6d97cdd /erts/internal_doc | |
| parent | 76cf34c49631845a21ffdd6d317d7fc944ab9b7b (diff) | |
| download | otp-0127f930e6aa2abc95ec4a95c9d5638d7e9bd512.tar.gz otp-0127f930e6aa2abc95ec4a95c9d5638d7e9bd512.tar.bz2 otp-0127f930e6aa2abc95ec4a95c9d5638d7e9bd512.zip | |
matherr() must not fake an FP exception
When FP exceptions are used, matherr() forces a fake FP exception,
which is interpreted as an error by the checking code after a math
routine call. This is wrong for several reasons:
- it's not necessary for error checking: when FP exceptions aren't
used, matherr() is a stub and no information is derived from it
being called
- it's not necessary for FPU maintenance: the FPU only needs to be
reprogrammed after an actual FP exception
- it causes false negatives: matherr() may be called even though
Erlang doesn't consider the case to be an error (exp() and pow()
underflows on Solaris for instance); with FP exceptions enabled
they are incorrectly considered errors
The fix is to remove all FP exception related code from matherr().
Diffstat (limited to 'erts/internal_doc')
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