[LLVMdev] RegisterScavenging on targets without subregisters

[Scott Michel]

Ugh. Management lobotomy kicked in. Need to RTFC better.

On Thu, Feb 25, 2010 at 6:18 PM, Scott Michel <scooter.phd at gmail.com> wrote:

> There's an assert at line 192, lib/CodeGen/RegisterScavenging.cpp that
> appears to get tripped on targets that don't have subregisters defined:
>
>         bool SubUsed = false;
>         for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
>              unsigned SubReg = *SubRegs; ++SubRegs)
>           if (isUsed(SubReg)) {
>             SubUsed = true;
>             break;
>           }
>         assert(SubUsed && "Using an undefined register!");
>
> CellSPU does not define any subregisters; consequently, SubUsed will always
> be false and trip the assert. What's the intended behavior (before I submit
> a bug report)?
>
>
> -scooter
>
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