6786 2008-07-30 14:52:00 +0000 erfc() does not set errno for underflow 2012-02-29 21:06:48 +0000 1 1 1 Unclassified glibc math unspecified All All NEW P2 normal --- 1 mtk.manpages unassigned glibc-bugs 24575 mtk.manpages 2008-07-30 14:52:55 +0000 When erfc() is given an argument that causes underflow (e.g., erfc(106.9) on x8632) it raises an underflow exception. However, errno is not set. It should be set to ERANGE for this case. Background: On error, many glibc math functions both set errno and raise an exception (fetestexcept(3)). For example, the following function all do this: acos(), asin(), cosh(), sinh(), acosh(), asinh(), exp(), exp2(), ldexp(), log(), log10(), log2(). However, there is much inconsistency. Some functions raise an exception, but don't set errno. Some functions set errno for some errors, but not others. A few set errno, but don't raise an exception. This series of bug reports documents deviations from what I consider the ideal: all functions should BOTH set errno AND raise an exception for all errors. All of these reports relate to tests on glibc 2.8 (as provided by SUSE 11.0). 24594 2851 mtk.manpages 2008-07-31 08:52:25 +0000 Created attachment 2851 test program (I got the underflow value wrong in my initial report. I think 106.9 gives underflow with the long double variant. 27 doies the trick for the double version.) Sample run showing problem: $ /tmp/mt_erfc 27 errno == 0 fetestexcept() says: FE_UNDERFLOW FE_INEXACT erfc(2.70000000000000000e+01)=5.23704643935262924e-319 0 FE_UNDERFLOW subnormal 53673 jsm28 2012-02-29 21:06:48 +0000 Confirmed with current sources on both x86 and x86_64. 2851 2008-07-31 08:52:00 +0000 2008-07-31 08:52:25 +0000 test program mt_erfc.c text/plain 11749 mtk.manpages LyogL3RtcC9tdF9lcmZjLmMgKGF1dG8tZ2VuZXJhdGVkIGF0IDIwMDgtMDctMzEgMTA6Mjg6MjAp ICovCiNkZWZpbmUgX1hPUEVOX1NPVVJDRSA2MDAKI2RlZmluZSBfR05VX1NPVVJDRQojaW5jbHVk ZSA8YXNzZXJ0Lmg+CiNpbmNsdWRlIDxzdGRsaWIuaD4KI2luY2x1ZGUgPHVuaXN0ZC5oPgojaW5j bHVkZSA8c3RkaW8uaD4KI2luY2x1ZGUgPGVycm5vLmg+CiNpbmNsdWRlIDxzdHJpbmcuaD4KI2lu Y2x1ZGUgPGZlbnYuaD4KI2luY2x1ZGUgPGxpbWl0cy5oPgojaW5jbHVkZSA8bWF0aC5oPgojaW5j bHVkZSA8ZmxvYXQuaD4KI2luY2x1ZGUgPGN0eXBlLmg+CgojZGVmaW5lIEVYSVRfdGVzdF9zZXR1 cF9mYWlsZWQgMgoKc3RhdGljIGludCB2ZXJib3NlID0gMTsKCi8qIENvbnZlcnQgYSBzdHJpbmcg dG8gYSBkb3VibGUsIGJ1dCBhbGxvdyBhIGZldyBzcGVjaWFsIGNhc2VzCiAgIGluIHRoZSBmb3Jt 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