[Llvm-bgq-discuss] Interpreting CLANG assembly

[Hal Finkel]

----- Original Message -----
> From: "Thomas Gooding" <tgooding at us.ibm.com>
> To: "Hal Finkel" <hfinkel at anl.gov>
> Cc: "Ian Karlin" <karlin1 at llnl.gov>, llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Thursday, April 18, 2013 2:51:35 PM
> Subject: Re: [Llvm-bgq-discuss] Interpreting CLANG assembly
> 
> 
> 
> llvm-bgq-discuss-bounces at lists.alcf.anl.gov wrote on 04/17/2013
> 11:06:14 PM:
> 
> > From:
> > 
> > Hal Finkel <hfinkel at anl.gov>
> > Can you be more specific about at what you're looking? The
> > underlying assembly language is indeed the same (and, as far as I
> > know, both compilers use the same underlying system assembler).
> 
> I'm not sure it uses the same assembler as gcc. The following is an
> instruction that gave me some trouble, it assembles under gcc but
> not llvm.
> mtfsf 0,%f0,1,0
> 
> start.S: Assembler messages:
> start.S:278: Error: junk at end of line: `1,0'
> 
> The mtfsf instruction appears to have additional parameters in the
> embedded PowerPC book.

That's odd; can you grep both assembly files so that I can see that LLVM prints vs. what gcc prints?

Thanks again,
Hal

> 
> Tom Gooding
> Senior Engineer / Blue Gene Kernels
> 507-253-0747 (internal: 553-0747)