[LLVMdev] TableGen: NumResults <= 1 restriction
Chris Lattner
clattner at apple.com
Wed May 13 10:14:26 PDT 2009
On May 13, 2009, at 7:22 AM, Stripf, Timo wrote:
> Hi all,
>
> i’m working atm on a backend for a processor architecture that is
> capable of storing the carry flag of ADDC in an 1-bit register
> class. So I tried to lower the ADDC instruction to generate two
> register values as result. On the tablegen description of the
> instruction i came across the tablegen restriction that only one
> output result of one instruction is possible:
>
> assert(NumResults <= 1 &&
> "We only work with nodes with zero or one result so far!");
>
> So my question is now how much work it would be to remove this
> restriction in tablegen. What do I have to take into consideration?
>
I don't know offhand, but this would be a very welcome improvement!
-Chris
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