When I run the attached script I get the following output:
[bradbell@brad-home trash]$ ./valgrind_tan_bug.sh
mkdir valgrind_bug
cd valgrind_bug
cat valgrind_bug.cpp
# include <limits>
# include <cmath>
# include <iostream>
int main(void)
{ float x = std::numeric_limits<float>::max() / float(2);
std::cout << "x = " << std::endl;
std::cout << "std::tan(x) = " << std::tan(x) << std::endl;
return 0;
}
g++ valgrind_bug.cpp -o valgrind_bug -g -Wall -ansi -pedantic-errors
-std=c++98 -Wshadow
./valgrind_bug x = std::tan(x) = 1.24272 valgrind ./valgrind_bug ==8289== Memcheck, a memory error detector ==8289== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al. ==8289== Using Valgrind-3.6.1 and LibVEX; rerun with -h for copyright info ==8289== Command: ./valgrind_bug ==8289== x = std::tan(x) = nan ==8289== ==8289== HEAP SUMMARY: ==8289== in use at exit: 0 bytes in 0 blocks ==8289== total heap usage: 0 allocs, 0 frees, 0 bytes allocated ==8289== ==8289== All heap blocks were freed -- no leaks are possible ==8289== ==8289== For counts of detected and suppressed errors, rerun with: -v ==8289== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 15 from 8) Note: value of tan(x) is different when run with valgrind uname -aLinux brad-home.localdomain 2.6.43.8-1.fc15.i686 #1 SMP Mon Jun 4 20:28:56 UTC 2012 i686 i686 i386 GNU/Linux
valgrind --version valgrind-3.6.1 g++ --version g++ (GCC) 4.6.1 20110908 (Red Hat 4.6.1-9) Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. [bradbell@brad-home trash]$
valgrind_tan_bug.sh
Description: application/shellscript
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