[LLVMdev] [ia64] Assertion failed: (!OpInfo.AssignedRegs.Regs.empty() && "Couldn't allocate input reg!")

[Chris Lattner]

On Tue, 20 May 2008, Marcel Moolenaar wrote:
> On May 20, 2008, at 1:45 PM, Marcel Moolenaar wrote:
>> The following IR is causing the assert:

The issue here is that the IA64 backend doesn't have inline asm support 
yet.  This should be pretty easy to add.  Take a look at the X86 version:
X86TargetLowering::getRegForInlineAsmConstraint

it just maps "r" onto the GPR register class, itanium should do something 
similar.

> Is it me or is the comment not really applicable to this particular
> case?

Right.  The issue is that the target didn't return info about what it is, 
so the generic code is trying to guess :).  The code at the end of the 
X86/X86ISelLowering.cpp file should be a good place to start, or the ARM 
backend or PPC which are somewhat simpler.

-Chris

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