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| author | Hans Wennborg <hans@hanshq.net> | 2018-02-22 12:53:02 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2018-02-22 12:53:02 +0000 |
| commit | 5d413c4a80edad74d83341b0c2568ce0411ce829 (patch) | |
| tree | cdc44cfddbf38ea13274b815e9a8e47a0f017263 /lib | |
| parent | a1f4098730e17f8a905fe823395f124ecf889d01 (diff) | |
Merging r325687:
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r325687 | sbaranga | 2018-02-21 16:20:32 +0100 (Wed, 21 Feb 2018) | 8 lines
[SCEV] Temporarily disable loop versioning for the purpose
of turning SCEVUnknowns of PHIs into AddRecExprs.
This feature is now hidden behind the -scev-version-unknown flag.
Fixes PR36032 and PR35432.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@325773 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 10b5c74e378..bfff7afb5b4 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -205,6 +205,11 @@ static cl::opt<unsigned> cl::desc("Max coefficients in AddRec during evolving"), cl::init(16)); +static cl::opt<bool> VersionUnknown( + "scev-version-unknown", cl::Hidden, + cl::desc("Use predicated scalar evolution to version SCEVUnknowns"), + cl::init(false)); + //===----------------------------------------------------------------------===// // SCEV class definitions //===----------------------------------------------------------------------===// @@ -11467,6 +11472,8 @@ private: // couldn't create an AddRec for it, or couldn't add the predicate), we just // return \p Expr. const SCEV *convertToAddRecWithPreds(const SCEVUnknown *Expr) { + if (!VersionUnknown) + return Expr; if (!isa<PHINode>(Expr->getValue())) return Expr; Optional<std::pair<const SCEV *, SmallVector<const SCEVPredicate *, 3>>> |