Detecting the reason for EXCEPTION_FLT_STACK_CHECK

Question

I have a compliacted C and C++ code with heavy mathematics calculations. I use intel C++ - the latest update to compile. I use optimizatons and the application does not give the expected answer. After a long time I managed to reduce the problem to getting EXCEPTION_FLT_STACK_CHECK 0xc0000092. If I compile without optimization - The program work as expected.

It's a single threaded code on Winxp64 (the application is 32-bit).

MSVC 2010 gives the same results with Debug or Release builds. (I mean Good=Expected results)

Can someone help me where to look? Currently I suspect a compiler bug - since I have no asmsembly code of my own, Only compiler-generated code. I looked at the assembler and it's SSE/x87 mixed code.

I'm looking for directions to look for. Since I'm on trial version (of the intel compiler) I don't have much time for investigations.

I will try to use /Qfp-stack-check tommorow to see if i can find something wrong with my code.

* Update * I just found a bug in intel compiler. A function returns a value on st(0) but the calling function does not remove it. That way i get the stack exception. Workaround is to use the returned value even that i dont always need it. I will try to reproduce it with code that I can share.

After this workaround intel was faster 35% then msvc2010 on the same code. - That's the main result.

mordy

Answer 1

• Update * I just found a bug in intel compiler. A function returns a value on st(0) but the calling function does not remove it. That way i get the stack exception. Workaround is to use the returned value even that i dont always need it.