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Author SHA1 Message Date
Florian Hahn cf9ee49b4d [DSE] Lift post-dominance for objs not accessible in caller. 
We can eliminate MemoryDefs of objects not accessible after the function
returns (e.g. alloca), if there are no reads between the MemoryDef and
any function exits. We can stop traversing paths that completely
overwrite the memory location of the MemoryDef.

This patch was split off D73763.

Reviewers: dmgreen, bryant, asbirlea, Tyker, efriedma, george.burgess.iv

Reviewed By: asbirlea, george.burgess.iv

Differential Revision: https://reviews.llvm.org/D77736
 2020-04-15 11:37:14 +01:00
Florian Hahn 4184b2e034 [DSE,MSSA] Add additional test cases for multi-path elimination (NFC). 
This adds additional test cases for more scenarios and also with objects
that are accessible after the functions return and allocas.
 2020-04-08 15:26:26 +01:00
Florian Hahn ece6cf0fa5 [DSE,MSSA] Precommit additional tests for D73763. 2020-03-20 13:39:46 +00:00