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Build # 11380194690

Build Type

push

github

Committed by Buristan

Commit Message

Limit CSE for IR_CARG to fix loop optimizations.

Thanks to Peter Cawley.

(cherry picked from commit 3bdc6498c)

`IR_CALLXS` for the vararg function contains `IR_CARG(fptr, ctid)` as
the second operand. The `loop_emit_phi()` scans only the first operand
of the IR, so the second is not marked as PHI. In this case, when the IR
appears in both the invariant and variant parts of the loop, CSE may
remove it and thus lead to incorrect emitting results.

This patch tweaks the CSE rules to avoid CSE across the `IR_LOOP`.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#10199

Run Details

5692 of 6033 branches covered (94.35%)

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4 of 4 new or added lines in 1 file covered. (100.0%)

21 existing lines in 5 files now uncovered.

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