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Sanjoy Das 5de9960136 [BasicAA] Fix zext & sext handling 
Summary:

There are several unhandled edge cases in BasicAA's GetLinearExpression
method. This changes fixes outstanding issues, including zext / sext of
a constant with the sign bit set, and the refusal to decompose zexts or
sexts of wrapping arithmetic.

Test Plan: Unit tests added in //q.ext.ll//.

Patch by Nick White.

Reviewers: hfinkel, sanjoy

Reviewed By: hfinkel, sanjoy

Subscribers: sanjoy, llvm-commits, hfinkel

Differential Revision: http://reviews.llvm.org/D6682

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236894 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-08 18:58:55 +00:00
..
AssumptionCache [PM] Actually add the new pass manager support for the assumption cache. 2015-01-22 21:53:09 +00:00
BasicAA [BasicAA] Fix zext & sext handling 2015-05-08 18:58:55 +00:00
BlockFrequencyInfo [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
BranchProbabilityInfo Fix information loss in branch probability computation. 2015-05-07 17:22:06 +00:00
CallGraph [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
CFLAliasAnalysis [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
CostModel [X86][SSE] Avoid scalarization of v2i64 vector shifts (REAPPLIED) 2015-03-18 22:18:51 +00:00
Delinearization Fix a type mismatch assert in SCEV division 2015-04-22 15:06:40 +00:00
DependenceAnalysis [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
DivergenceAnalysis/NVPTX Divergence analysis for GPU programs 2015-04-10 05:03:50 +00:00
Dominators [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
GlobalsModRef [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
LazyCallGraph [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
Lint Make llvm.eh.begincatch use an outparam 2015-03-03 17:41:09 +00:00
LoopAccessAnalysis [getUnderlyingOjbects] Analyze loop PHIs further to remove false positives 2015-04-23 20:09:20 +00:00
LoopInfo [PM] Port LoopInfo to the new pass manager, adding both a LoopAnalysis 2015-01-20 10:58:50 +00:00
MemoryDependenceAnalysis [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
PostDominators FileCheck-ize tests. 2013-08-22 00:51:19 +00:00
RegionInfo [tests] Cleanup initialization of test suffixes. 2013-08-16 00:37:11 +00:00
ScalarEvolution [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
ScopedNoAliasAA [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
TypeBasedAliasAnalysis [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
ValueTracking Extend the statepoint intrinsic to allow statepoints to be marked as transitions from GC-aware code to code that is not GC-aware. 2015-05-08 18:07:42 +00:00