llvm dev - Jun 2005 - [LLVMdev] Re: llvm linux/PPC cfrontend

Cyrille Mescam wrote:
> Morning,
> 
> I would like to know if you received my mail with the assembly code
> you wanted.
> 
> It not, i'll send it again to you.
> 
> Thanks for your help.
> 
> Regards.
> 
> Cyrille
> 
I've looked into the files you sent me, and it seems that the problem is 
occuring due to the C library simplication pass (which is run by gccas). 
  What appears to be happening is that a call to fprintf() is being 
changed to a call to fwrite(), but this transform is being done 
incorrectly because the fprintf() is being passed a ubyte * while 
fwrite() takes an sbyte *.

I'm creating a reduced testcase right now, but in the meantime, I'd like
for you to try something.  This should work around the problem that 
you're having (as well as verify that I understand the problem):

Go into your LLVM source tree and comment out the following line in 
llvm/tools/gccas/gccas.cpp:

addPass(PM, createSimplifyLibCallsPass());     // Library Call Optimizations

Rebuild gccas.  Then, try to build the LLVM GCC frontend again.  Please 
email the llvmdev list and let us know if it works.

In the meantime, I will continue to try to get a reduced test case and 
either fix the bug or hand it off to Reid (the author of the C library 
simplification pass).

-- John T.

-- 
John T. Criswell
Research Programmer
University of Illinois at Urbana-Champaign
"It's today!" said Piglet. "My favorite day," said Pooh.

Chris Lattner wrote:
> On Tue, 28 Jun 2005, John Criswell wrote:
> 
>> addPass(PM, createSimplifyLibCallsPass());     // Library Call 
>> Optimizations
>>
>> Rebuild gccas.  Then, try to build the LLVM GCC frontend again.  
>> Please email the llvmdev list and let us know if it works.
>>
>> In the meantime, I will continue to try to get a reduced test case and 
>> either fix the bug or hand it off to Reid (the author of the C library 
>> simplification pass).
> 
> 
> Please file a PR for this.  If noone else beats me to it, I will look 
> into it tonight.  However, feel free to beat me to it. :)
But of course.  I'm just waiting for bugpoint to finishing chomping on it.
:)
> 
> -Chris
> 
-- John T.

-- 
John T. Criswell
Research Programmer
University of Illinois at Urbana-Champaign
"It's today!" said Piglet. "My favorite day," said Pooh.

On Tue, 28 Jun 2005, John Criswell wrote:
> addPass(PM, createSimplifyLibCallsPass());     // Library Call
Optimizations
>
> Rebuild gccas.  Then, try to build the LLVM GCC frontend again.  Please
email
> the llvmdev list and let us know if it works.
>
> In the meantime, I will continue to try to get a reduced test case and
either
> fix the bug or hand it off to Reid (the author of the C library 
> simplification pass).
Please file a PR for this.  If noone else beats me to it, I will look into 
it tonight.  However, feel free to beat me to it. :)

-Chris

-- 
http://nondot.org/sabre/
http://llvm.cs.uiuc.edu/