[LLVMdev] Instruction selection of intrinsics
Jonas Paulsson
jnspaulsson at hotmail.com
Tue Feb 15 08:03:04 PST 2011
Hi,
I am a bit stuck with this because the intrinsics on the LLVM I/R can only have one value, but for a memory intrinsic, I need it to have two values actually.
How should I add the second value and maintain the control chain?
The intrinsic looks like (MVT::i16, MVT::other), and if I lower the node to (MVT::i16, MVT::i16, MVT::other), I get the problem that the user of the chain is not updated to the right value index. Should I put the chain in the same slot, like (MVT::i16, MVT::other, MVT::i16), to avoid this, or must the chain be last value / first operand always, and if so, why?
Or, should I perhaps use a custom lowering and add the operand manually?
thanks,
Jonas
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