llvm dev - Jul 2011 - [LLVMdev] 32bit MIPS (little endian) code gen for simplescalar 3.0

We are using simplescalar 3.0 as an architecture simulation platform for our
research. The current version of the simplescalar still uses gnu binutils
1.5. and gcc-2.7.2 to generate 32bit mips code. We are currently trying to
replace gcc-2.7.2 by LLVM current. However, the generated code cannot be
processed by this old binutils-1.5. We expect that it can be quite difficult
to make simplescalar use the current gnu binutils. Instead, we are thinking
of modifing llc to generate mips code for binutils-1.5. Having said this,
could you advise which module(s) in LLVM we need to modify? Thanks in
advance.

Regards,

-- 

-- 
Gang-Ryung Uh, Associate Professor
Department of Computer Science
College of Engineering, Boise State Univerisity
tel: 1 208 426-5691  e-mail:guh at boisestate.edu
http://cs.boisestate.edu/~uh
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On Jul 17, 2011, at 8:29 AM, Gang-Ryung Uh wrote:
> We are using simplescalar 3.0 as an architecture simulation platform for
our research. The current version of the simplescalar still uses gnu binutils
1.5. and gcc-2.7.2 to generate 32bit mips code. We are currently trying to
replace gcc-2.7.2 by LLVM current. However, the generated code cannot be
processed by this old binutils-1.5. We expect that it can be quite difficult to
make simplescalar use the current gnu binutils. Instead, we are thinking of
modifing llc to generate mips code for binutils-1.5. Having said this, could you
advise which module(s) in LLVM we need to modify? Thanks in advance.
Your best bet would be to modify simplescalar to be more up to date since, as
far as the assembler is concerned, that's a single file. That said you'd
need to modify the mips backend in llvm/lib/Target/Mips to output code
that's compatible with your target.

-eric