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[LVI] Add an API to LazyValueInfo so that it can export ConstantRanges

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that it computes. Currently this is used for testing and precision
tuning, but it might be used by optimizations later.

Differential Revision: http://reviews.llvm.org/D19179

llvm-svn: 268291
This commit is contained in:
John Regehr 2016-05-02 19:58:00 +00:00
parent 6c3bbc1c10
commit b357c876ed
2 changed files with 22 additions and 0 deletions
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6
include/llvm/Analysis/LazyValueInfo.h
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@ -20,6 +20,7 @@
namespace llvm {
class AssumptionCache;
class Constant;
class ConstantRange;
class DataLayout;
class DominatorTree;
class Instruction;
@ -65,6 +66,11 @@ public:
/// constant at the end of the specified block. Return null if not.
Constant *getConstant(Value *V, BasicBlock *BB, Instruction *CxtI = nullptr);
/// Return the ConstantRange constraint that is known to hold for the
/// specified value at the end of the specified block. This may only be called
/// on integer-typed Values.
ConstantRange getConstantRange(Value *V, BasicBlock *BB, Instruction *CxtI = nullptr);
/// Determine whether the specified value is known to be a
/// constant on the specified edge. Return null if not.
Constant *getConstantOnEdge(Value *V, BasicBlock *FromBB, BasicBlock *ToBB,

16
lib/Analysis/LazyValueInfo.cpp
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@ -1485,6 +1485,22 @@ Constant *LazyValueInfo::getConstant(Value *V, BasicBlock *BB,
return nullptr;
}
ConstantRange LazyValueInfo::getConstantRange(Value *V, BasicBlock *BB,
Instruction *CxtI) {
assert(V->getType()->isIntegerTy());
unsigned Width = V->getType()->getIntegerBitWidth();
const DataLayout &DL = BB->getModule()->getDataLayout();
LVILatticeVal Result =
getCache(PImpl, AC, &DL, DT).getValueInBlock(V, BB, CxtI);
assert(!Result.isConstant());
if (Result.isUndefined())
return ConstantRange(Width, /*isFullSet=*/false);
if (Result.isConstantRange())
return Result.getConstantRange();
else
return ConstantRange(Width, /*isFullSet=*/true);
}
/// Determine whether the specified value is known to be a
/// constant on the specified edge. Return null if not.
Constant *LazyValueInfo::getConstantOnEdge(Value *V, BasicBlock *FromBB,