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Re: [PATCH]: update to df for mainline.

Kenneth Zadeck wrote:

Is this correct, and if it is not what is wrong with it.

I hesitate to review pseudo code, given how ambiguous some of the terms are... I can only repeat, have a look at flow.c's mark_set_1, case SUBREG. I believe it handles everything you need to know.

if (single word register)

For a suitable definition of "single word register". Pseudos and hard regs likely will require separate treatment.

if (set is of a subreg of the mw register)

Only if it really is a _sub_register. You could also get (subreg:DF (reg:DI x)), which really is mode-punning, rather than a partial access.


Bernd

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