Possible std.math.exp() bug

[anthony.difranco at yale.edu]

Ideas?  Help much appreciated; this is a huge obstacle right now.  Have
reproduced this on two different x86 linux systems.  Nothing special about 3.0
in reproducing this.  Have verified that the corresponding C library exp()
works.

real tgamma(real x);
The Gamma function, Γ(x)

$ cat test.d
import std.math;

int main(char[][] args)
{
printf("f(3.0) %f\n", sqrt(3.0));
printf("g(3.0) %f\n", exp(3.0));
printf("h(3.0) %f\n", tgamma(3.0));
return 1;
}

$ dmd test.d
gcc test.o -o test -lphobos -lpthread -lm

$ ./test
f(3.0) 1.732051
g(3.0) -0.000000
h(3.0) -0.000000

$ dmd
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