Matt Arsenault d246cc618a PeepholeOpt: Do not add subregister indexes to reg_sequence operands (#124111) ...

Given the rest of the pass just gives up when it needs to compose
subregisters, folding a subregister extract directly into a reg_sequence
is counterproductive. Later fold attempts in the function will give up
on the subregister operand, preventing looking up through the reg_sequence.

It may still be profitable to do these folds if we start handling
the composes. There are some test regressions, but this mostly
looks better.

2025-01-30 20:42:02 +07:00

454 KiB

Raw Blame History

View Raw