Using `callgrind` to count function calls in Linux

Question

I am trying to track function call counts on a program I'm interested in. If I run the program on its own, it will run fine. If I try to run it with valgrind using the command seen below I seem to be getting a different result.

Command run:

Produces this input immediately, even though the execution is normally slow.

Answer 1

valgrind has limited floating point support. You're probably using non-standard or very large floats.

UPDATE: since you're using long double, you're outta luck. Unfortunately,

Your least-worst option is to find a way to make your world work just using standard IEEE754 64-bit double precision.

This probably isn't easy considering you're using an existing project.

Answer 2

I'd say that this is more likely to be related to this issue. However to be certain you will need to tell us

1. what compilation options are being used - specifically are you using anything related to AVX or x87?
2. What hardware this is running on.

It would help if you can cut this down to a small example and either update this or the frexp bugzilla items.