diff options
| author | Dan Gohman <gohman@apple.com> | 2009-05-18 15:22:39 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-05-18 15:22:39 +0000 |
| commit | 70a1fe704831f9b842be0b2a2af5f7082b0e540c (patch) | |
| tree | 50ab317a552eeee19906877fbd6fce9b58bdb31b /lib/Analysis/ScalarEvolution.cpp | |
| parent | 04623272d29aa15b913f53748516b206d60c0f29 (diff) | |
Add an isOne() utility function to ScalarEvolution, similar to isZero()
and similar to ConstantInt's isOne().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72003 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 77a8070631..4b99a869ff 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -127,6 +127,11 @@ bool SCEV::isZero() const { return false; } +bool SCEV::isOne() const { + if (const SCEVConstant *SC = dyn_cast<SCEVConstant>(this)) + return SC->getValue()->isOne(); + return false; +} SCEVCouldNotCompute::SCEVCouldNotCompute() : SCEV(scCouldNotCompute) {} SCEVCouldNotCompute::~SCEVCouldNotCompute() {} @@ -3392,7 +3397,7 @@ HowManyLessThans(const SCEV *LHS, const SCEV *RHS, const SCEVConstant *CStep = dyn_cast<SCEVConstant>(Step); if (!CStep || CStep->isZero()) return UnknownValue; - if (CStep->getValue()->getValue() == 1) { + if (CStep->isOne()) { // With unit stride, the iteration never steps past the limit value. } else if (CStep->getValue()->getValue().isStrictlyPositive()) { if (const SCEVConstant *CLimit = dyn_cast<SCEVConstant>(RHS)) { |