[LLVMdev] long double type on ARM

[Jim Grosbach]

That would certainly do it. LLVM IR is not target-independent.

-Jim

On Sep 30, 2009, at 9:23 AM, Bob Wilson wrote:

> Unlike llvm itself, llvm-gcc needs to be configured for a particular  
> target architecture.  It looks like you're using a copy of llvm-gcc  
> that was built to generate x86 code.
>
> On Sep 30, 2009, at 6:27 AM, Jin Gu Kang wrote:
>
>> 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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