https://llvm.org/bugs/show_bug.cgi?id=28958
Bug ID: 28958
Summary: [memcpyopt] Memcpy-memcpy dependence isn't detected
across basic blocks.
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 16939
--> https://llvm.org/bugs/attachment.cgi?id=16939&action=edit
Proposed patch, part 1.
The memory dependence queries in the memcpy optimizer don't take the nonlocal
case into account. The attached patch fixes this; with it, 28% of the memcpy
calls in librustc (part of the Rust compiler) are eliminated.
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