Yashas Andaluri a361de6d13 [RDF] Create phi nodes for clobbering defs (#123694) ...

When a def in a block A reaches another block B that is in A's iterated
dominance frontier, a phi node is added to B for the def register.

A clobbering def can be created at a call instruction, for a register
clobbered by a call.
However, phi nodes are not created for a register, when one of the
reaching defs of the register is a clobbering def.

This patch adds phi nodes for registers that have a clobbering reaching
def. These additional phis help in checking reaching defs for an
instruction in RDF based copy propagation and addressing mode
optimizations.

2025-02-07 08:28:29 -06:00

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