Connor Abbott
edf23e15eb
To simplify the pre-RA merge set code and express the result live-range splitting in RA, we need to add support for parallel copy instructions, and for the merge set code these parallel copies need to be in SSA form. Parallel copies have multiple destinations by necessity, but there was no way to express this in the existing IR. In particular there was no support for marking a register as being a destination, and no support for indicating which destination register out of several an SSA source refers to. This replaces ir3_register::instr with ir3_register::def and re-purposes ir3_register::instr. I haven't propagated this into common helpers, like ssa(), because that would vastly increase the amount of churn and the number of places that produce such instructions should be limited -- only RA will create parallel copies and they will be destroyed right after RA. In the future swz will have multiple destinations too, but it will only be created after RA via parallel copy lowering. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9842>
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