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Ran 21 Jun 2023 01:14PM UTC

Files 348

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Committed 21 Jun 2023 12:52AM UTC coverage: 87.472% (+1.2%) from 86.316%

Job # #37576.1

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push

local

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web-flow

Commit Message

Avoid creating invalid PhiNodes in IR passes (#50235)

As of #50158, irverify catches cases where PhiNodes show up in the
middle of a basic block (which is illegal). Unfortunately, it turns
out there were two cases in Base, where we created just such code:

1. When cfg_simplify! merged basic blocks, it didn't bother to delete
   (resp, replace by the one incoming edge) the PhiNodes in the basic
   block it was merging.

2. In irinterp we try to delete instructions that result in constants.
   This is not legal if the instruction is a PhiNode.

The second of these is somewhat unfortunate, but any subsequent compaction
will of course take care of it, so I don't think it's a huge issue
to just disable the replacement.

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73734 of 84294 relevant lines covered (87.47%)

32716237.11 hits per line

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