[LLVMdev] long double type on ARM

[Jin Gu Kang]

Hi Xerxes!

Now, I tried to compile 'od' program's bitcode using llc in llvm 2.6 release.
but there was same error as before.

To avoid this problem, 
I modified a little bit code in $llvm_src/lib/Bitcode/Reader/BitcodeReader.cpp file

bool BitcodeReader::ParseTypeTable()
{
....
    switch (Stream.ReadRecord(Code, Record)) {
....    
    case bitc::TYPE_CODE_X86_FP80:  // X86_FP80
       if target is arm
         ResultTy = Type::DoubleTy;
       else
         ResultTy = Type::X86_FP80Ty;
....
}

I will send the bugreport for this problem with 'od.bc' file attatchment.

Thank you

Best regards,

Jin-Gu kang
________________________________________
From: Xerxes Ra*nby [xerxes at zafena.se]
Sent: Wednesday, September 30, 2009 11:37 PM
To: Jin Gu Kang; LLVM Developers Mailing List
Subject: Re: [LLVMdev] long double type on ARM

Hi Jin-Gu Kang!
It are possible that the problem you are experiencing have already been
solved in the current llvm 2.6 release tree and the current svn trunk.
So try using llc from llvm 2.6 release branch or llvm pre2.7 svn trunk!

It would be helpful if you could open a bugreport for this issue and
attach the problematic od.bc since we need a testcase from the bitcode
that exposes the bug inorder to help you analyse and solve your problem.

Cheers
Xerxes

Jin Gu Kang skrev:
> Dear LLVM members.
> I am compiling coreutils-7.4 package for ARM linux using LLVM 2.5 version.
> When i compiled 'od' program in coreutils package using LLVM 2.5,
> i could see the error message on llc processing.
> > llvm-gcc -emit-llvm ./od.c -c -o ./od.bc /-other-options.../
> > llc -march=arm ./od.bc -f -o ./od.s
> llc:
> /home/jaykang10/HardDisk2/Projects/LLVM/src/llvm-2.5/lib/Target/TargetData.cpp:305:
> unsigned int llvm::TargetData::getAlignmentInfo(llvm::AlignTypeEnum,
> uint32_t, bool, const llvm::Type*) const: Assertion `AlignType ==
> VECTOR_ALIGN && "Unknown alignment type!"' failed.
> The problem was that
> when i converted 'od' source code to llvm bitcode, long double type of
> 'od' source code was changed to x86_fp80 type in llvm bitcode and then
> llc on ARM target was not support x86_fp80 type.
> I think that long double type on ARM is 8 byte. (same as double type)
> When we use llvm on ARM target,(or other target not support x86_fp80)
> i think it might be better to convert long double type in C to double
> type in llvm bitcode on llvm-gcc or
> treat x86_fp80 type in llvm bitcode as double type on llc.
> (I wonder if we select the target at llvm-gcc build time)
> I would like to know how to solve the above problem.
> Thank you
> Best regards,
> Jin-Gu Kang
> ------------------------------------------------------------------------
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