Joseph Savona 3a200fa4a1 Pass to eliminate redundant phis ...

This is an alternate take on phi elimination to the one we pursued over VC w 
@poteto driving. This version exploits the RPO ordering of blocks to do phi 
elimination in a single pass when there are no loops, and to minimize repeated 
visits when there are loops. The main difference is when redundant phis are 
removed. Rather than eagerly walking through the CFG for each pruned phi to 
rewrite its uses, we build up a mapping of rewritten identifiers. As we walk 
through subsequent instructions, we rewrite each place based on that mapping. We 
continue cycling through the blocks so long as a given iteration *both* added 
new rewrites (meaning there may be subsequent uses to rewrite) *and* there are 
back-edges. With no loops this results in a single visit of each block and of 
each instruction, but even with loops this is bounded.

2022-11-07 08:37:19 -08:00

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Pass to eliminate redundant phis

2022-11-07 08:37:19 -08:00

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