[LLVMdev] Re: Problems Cross Compiling for x86 and ia64

[Chris Lattner]

On Fri, 16 Sep 2005, Michael McCracken wrote:
> OK, I noticed a few problems with my previous email, so I will boil
> the question down:
>
> What I want to do is compile for x86 and ia64 from darwin.
> I also want to load my own passes into opt and llc.

Ok.

> Should I be using llvmc at all here, or should I be doing something
> like llvmgcc -> gccas -> opt -> llc ?

No, llvmc is not finished yet.  Using the pipeline above should work.

> I've given up on the filetype=obj argument, so now the problem is that
> llc is crashing when I use -march=ia64. I'd appreciate help tracking
> this down. I've included the backtrace here.

filetype=obj is not yet complete, and will only be supported on some 
targets.  Just output .s files as normal and things shoudl work.  IF you 
send me a bugpointed version of the ia64 crash, I (or duraid) can look 
into it.

Just run this:

bugpoint -run-llc loopUnroll.bc -tool-args -march=ia64

That should reduce loopUnroll to something smallish.

Thanks!

-Chris

> Thanks,
> -mike
>
> (gdb) run -march=ia64 loopUnroll.bc -f
> Starting program:
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/Debug/bin/llc
> -march=ia64 loopUnroll.bc -f
> Reading symbols for shared libraries . done
>
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> Reason: KERN_PROTECTION_FAILURE at address: 0x00000018
> 0x00513d50 in llvm::MachineInstr::getParent (this=0x0) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/include/llvm/Analysis/LoopInfo.h:433
> Line number 433 out of range;
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/include/llvm/Analysis/LoopInfo.h
> has 336 lines.
> (gdb) bt
> #0  0x00513d50 in llvm::MachineInstr::getParent (this=0x0) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/include/llvm/Analysis/LoopInfo.h:433
> #1  0x001ca99c in (anonymous
> namespace)::RA::assignRegOrStackSlotAtInterval (this=0x8b010f0,
> cur=0x8b34114) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/CodeGen/RegAllocLinearScan.cpp:567
> #2  0x001cca64 in (anonymous namespace)::RA::linearScan
> (this=0x8b010f0) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/CodeGen/RegAllocLinearScan.cpp:276
> #3  0x001cd328 in (anonymous namespace)::RA::runOnMachineFunction
> (this=0x8b010f0, fn=@0x8b122c0) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/CodeGen/RegAllocLinearScan.cpp:214
> #4  0x005632e0 in llvm::MachineFunctionPass::runOnFunction
> (this=0x8b010f0, F=@0x8b05010) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/include/llvm/CodeGen/MachineFunctionPass.h:38
> #5  0x007c3390 in llvm::PassManagerTraits<llvm::Function>::runPass
> (P=0x8b010f0, F=0x8b05010) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/PassManagerT.h:706
> #6  0x007e1fb0 in llvm::PassManagerT<llvm::Function>::runOnUnit
> (this=0x8b12cb0, M=0x8b05010) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/PassManagerT.h:256
> #7  0x007c3624 in
> llvm::PassManagerTraits<llvm::Function>::runOnFunction
> (this=0x8b12cb0, F=@0x8b05010) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/PassManagerT.h:810
> #8  0x00283384 in llvm::FunctionPass::runOnModule (this=0x8b12cb0,
> M=@0x8b02580) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/Pass.cpp:252
> #9  0x007c3494 in llvm::PassManagerTraits<llvm::Module>::runPass
> (P=0x8b12cb0, M=0x8b02580) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/PassManagerT.h:746
> #10 0x007df4dc in llvm::PassManagerT<llvm::Module>::runOnUnit
> (this=0x8b0d770, M=0x8b02580) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/PassManagerT.h:256
> #11 0x007c3564 in llvm::PassManagerTraits<llvm::Module>::runOnModule
> (this=0x8b0d770, M=@0x8b02580) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/PassManagerT.h:755
> #12 0x00282128 in llvm::PassManager::run (this=0xbfffee94,
> M=@0x8b02580) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/VMCore/Pass.cpp:88
> #13 0x00003dc8 in main (argc=4, argv=0xbfffefc8) at
> /Users/mike/Documents/hpcl/LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/tools/llc/llc.cpp:221
> (gdb)
>
> On 9/15/05, Michael McCracken <michael.mccracken at gmail.com> wrote:
>> Hi, I'm having some problems cross-compiling from ppc (OS X) to x86
>> object files and to ia64, at all. I'd appreciate some advice as to
>> whether or not I'm actually supposed to be able to do this, and what's
>> wrong if so.
>>
>> Here's how I configured it:
>>
>> ../llvm-darcslocal/llvm/configure --with-llvmgccdir=$LLVMGCCDIR
>> --prefix=$HOME/Documents/hpcl/LLVM/install
>>
>> The results work fine when building for ppc.
>>
>> Here's what I tried:
>>
>> LLVM/cfe-src/install/bin/gcc -o loopUnroll loopUnroll.c
>> LLVM/obj-llvm-darcslocal/Debug/bin/llvmc -O3 -o loopUnroll-llvm loopUnroll.bc
>> llvm-ld: warning: Cannot find library 'c'
>>
>> LLVM/obj-llvm-darcslocal/Debug/bin/llc -march=x86 -f -filetype=obj -o
>> loopUnroll-x86 loopUnroll.bc
>> LLVM/obj-llvm-darcslocal/../llvm-darcslocal/llvm/lib/CodeGen/ELFWriter.cpp:63:
>> failed assertion `0 && "unimp"'
>> ^Cmake: *** [llvm-x86] Abort trap (core dumped)
>>
>> -- note that without -filetype=obj I get no problems and an apparently
>> fine x86 asm file.
>>
>> LLVM/obj-llvm-darcslocal/Debug/bin//llc -march=ia64 -stats -f -o
>> loopUnroll-ia64 loopUnroll.bc
>> make: *** [llvm-ia64] Bus error (core dumped)
>>
>> -- note that this has no -filetype option at all.
>>
>> Any hints?
>>
>> Thanks,
>> -mike
>>
>> --
>> Michael McCracken
>> UCSD CSE PhD Candidate
>> research: http://www.cse.ucsd.edu/~mmccrack/
>> misc: http://michael-mccracken.net/blog/
>>
>
>
>

-Chris

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