[llvm-dev] Glue two instructions together

[Przemyslaw Ossowski via llvm-dev]

Hi,



for DAG-to-DAG instruction selection I’ve implemented a pattern, which
creates from one SDNode two instructions, something like:



def: Pat<(NEW_SDNODE REG:$r1),

         (INST_OUT (INST_IN), REG:$r1)>;



where INST_IN doesn't  accepts any inputs and INST_OUT accepts two inputs -
one returned by INST_IN and REG;$r1.


Is there any possibility to ‘Glue’ two instruction created in a such way?
Maybe something similar to creation SDNodes with SDNPOutGlue, SDNPInGlue) ?


These two instructions INST_IN and INST_OUT have to be one after another
without any other inserted between them.



Thanks,

Przemek
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