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[DAGCombine] Improve Load-Store Forwarding

Description

[DAGCombine] Improve Load-Store Forwarding

Summary:
Extend analysis forwarding loads from preceeding stores to work with
extended loads and truncated stores to the same address so long as the
load is fully subsumed by the store.

Hexagon's swp-epilog-phis.ll and swp-memrefs-epilog1.ll test are
deleted as they've no longer seem to be relevant.

Reviewers: RKSimon, rnk, kparzysz, javed.absar

Subscribers: sdardis, nemanjai, hiraditya, atanasyan, llvm-commits

Differential Revision: https://reviews.llvm.org/D49200

Details

Committed
niravdOct 10 2018, 7:15 AM
Differential Revision
D49200: [DAGCombine] Improve Load-Store Forwarding
Parents
rL344141: [x86] allow single source horizontal op matching (PR39195)
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