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Author SHA1 Message Date
Florian Hahn 4e62c6359c [DSE] Eliminate stores at the end of the function. 
This patch add support for eliminating MemoryDefs that do not have any
aliasing users, which indicates that there are no reads/writes to the
memory location until the end of the function.

To eliminate such defs, we have to ensure that the underlying object is
not visible in the caller and does not escape via returning. We need a
separate check for that, as InvisibleToCaller does not consider returns.

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

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D72631
 2020-06-24 12:58:20 +01:00
Florian Hahn 81dbb6aec6 Recommit "[DSE] Add first version of MemorySSA-backed DSE (Bottom up walk)." 
This includes a fix for the santizier failures.

This reverts the revert commit
42f8b915eb.
 2020-02-12 14:17:50 +00:00
Kadir Cetinkaya 42f8b915eb
Revert "[DSE] Add first version of MemorySSA-backed DSE (Bottom up walk)." 
This reverts commit d0c4d4fe09.

Revert "[DSE,MSSA] Move more passing test cases from todo to simple.ll."

This reverts commit 02266e64bb.

Revert "[DSE,MSSA] Adjust mda-with-dbg-values.ll to MSSA backed DSE."

This reverts commit 74f03e4ff0.
 2020-02-11 15:34:48 +01:00
Florian Hahn 74f03e4ff0 [DSE,MSSA] Adjust mda-with-dbg-values.ll to MSSA backed DSE. 
-memdep-block-scan-limit is not relevant with MSSA.
 2020-02-10 15:24:00 +00:00
Florian Hahn da52b9c118 [DSE] Add tests for MemorySSA based DSE. 
This copies the DSE tests into a MSSA subdirectory to test the MemorySSA
backed DSE implementation, without disturbing the original tests.

Differential Revision: https://reviews.llvm.org/D72145
 2020-02-10 10:28:43 +00:00