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MFC r309722:

Description

MFC r309722:

Pull in r281586 from upstream llvm trunk (by Wei Mi):

Add some shortcuts in LazyValueInfo to reduce compile time of
Correlated Value Propagation.

The patch is to partially fix PR10584. Correlated Value Propagation
queries LVI to check non-null for pointer params of each callsite. If
we know the def of param is an alloca instruction, we know it is
non-null and can return early from LVI. Similarly, CVP queries LVI to
check whether pointer for each mem access is constant. If the def of
the pointer is an alloca instruction, we know it is not a constant
pointer. These shortcuts can reduce the cost of CVP significantly.

Differential Revision: https://reviews.llvm.org/D18066

This significantly reduces memory usage and compilation time when
compiling a particular C++ source file of the graphics/colmap port.

PR: 215136

Details

Committed
dimDec 11 2016, 7:58 PM
Parents
rS309856: Postpone ZVOL media/block size caching till first open.
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