Debug with DW_OP_piece and DW_OP_bit_piece

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#1

We are running into trouble with debug information in that we have registers along with sub registers, and they both point to the same dwarf register. Does LLVM support the DW_OP_piece/bit_piece debug information when allocating a sub-register from a super register? If not, is there any plan to add it? If not, would it be difficult to add?

Thanks,

Micah

#2

It would not be too difficult to add for your target. Today, ARM code gen supports this. See ARMAsmPrinter::EmitDwarfRegOp().

#3

Thanks! I didn’t see this in the 2.9 tree anywhere, looks like it has been added since then.