[LLVMdev] code generation problem

Óscar Fuentes ofv at wanadoo.es
Wed Sep 12 04:41:47 PDT 2012

"Weiss, Eran" <Eran.Weiss at emc.com> writes:

> I have a problem with JIT code generation on mac. The LLVM-IR I have
> is fine, but the machine code generated crashes.  I see two
> instructions "add %al,(%eax)" (which are four 0 bytes, numerically)
> prior to function calls. As eax holds the pointer to the called
> function, this crashes with SIGBUS. These instructions don't make
> sense in the context of the code, which is why I'm suspecting a code
> generation error. I'd appreciate any any suggestions regarding what
> could cause this behavior or where to look for clues.

The most effective way of dealing with this type of problems is to
create a complete, minimal test case and file a bug report. Once done
this, the usual outcome is that either the bug is quickly fixed or the
comments from others will help you on your understanding of the problem.

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