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List:       llvm-dev
Subject:    Re: [LLVMdev] bsr not implemented?
From:       Duncan Sands <baldrick () free ! fr>
Date:       2011-04-09 14:42:22
Message-ID: 4DA0704E.9080409 () free ! fr
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Hi Gunther,

> just trying to use the dragonegg plugin with gcc on my project.
> Unfortunately I get an
>
> /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.5.2/include/ia32intrin.h:170:35:
> error: unsupported target builtin ‘__builtin_ia32_bsrdi’ used

yup, bsrdi and bsrsi aren't implemented (yet).  Please open a bug report about
this.  The unimplemented x86 builtins are those commented out in the file
x86/x86_builtins

> error. I use (and need) the "bsr" (bit scan reverse) instruction. So it
> seems it isn't implemented (yet). Can I safely use gcc inline assembly
> instead?

Yes, inline assembly should work.

  Are the some preprocessor macros defined while using dragonegg
> so that I can conditionally compile?

No, and I don't think it is possible to add any.  On the other hand
you can always add -DDRAGONEGG or something to your compilation flags
when you are using the plugin.

Ciao, Duncan.
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