[LLVMdev] Disassembler Issue

Jeff Bush jeffbush001 at gmail.com
Sun Sep 1 19:21:29 PDT 2013

I'm having trouble getting TableGen to generate disassembler code.
The issue is that I have several TableGen definitions that emit the
same instruction encoding.  This results in TableGen complaining about
encoding conflicts (and not handling those instructions).

For example, general purpose registers in the architecture I'm
targeting can hold floating point or integer values.  As such, I
created a multiclass for load/store instructions that have both
integer and floating point patterns. I've done similar things in other
areas, for example, ctlz and ctlz_zero_undef.

All of this stuff works fine for everything except when trying to
create a disassembler. My question is what the proper way is to make
several instruction patterns map to the same instruction encoding,
something that doesn't confuse the disassembler.



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