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"This patch adds a virtual call to AbstractLatticeFunction to derive a

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type lattice value for an Argument*, giving clients the opportunity to
use something other than Top for it if they choose to."

Patch by John McCall!

llvm-svn: 54589
This commit is contained in:
Chris Lattner 2008-08-09 17:23:35 +00:00
parent 310343bae7
commit 89120a8e63
2 changed files with 10 additions and 1 deletions
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7
include/llvm/Analysis/SparsePropagation.h
View File

@ -24,6 +24,7 @@
namespace llvm {
class Value;
class Constant;
class Argument;
class Instruction;
class PHINode;
class TerminatorInst;
@ -75,6 +76,12 @@ public:
virtual Constant *GetConstant(LatticeVal LV, Value *Val, SparseSolver &SS) {
return 0;
}
/// ComputeArgument - Given a formal argument value, compute and return a
/// lattice value corresponding to the specified argument.
virtual LatticeVal ComputeArgument(Argument *I) {
return getOverdefinedVal(); // always safe
}
/// MergeValues - Compute and return the merge of the two specified lattice
/// values. Merging should only move one direction down the lattice to

4
lib/Analysis/SparsePropagation.cpp
View File

@ -57,8 +57,10 @@ SparseSolver::LatticeVal SparseSolver::getOrInitValueState(Value *V) {
return LatticeFunc->getUntrackedVal();
else if (Constant *C = dyn_cast<Constant>(V))
LV = LatticeFunc->ComputeConstant(C);
else if (Argument *A = dyn_cast<Argument>(V))
LV = LatticeFunc->ComputeArgument(A);
else if (!isa<Instruction>(V))
// Non-instructions (e.g. formal arguments) are overdefined.
// All other non-instructions are overdefined.
LV = LatticeFunc->getOverdefinedVal();
else
// All instructions are underdefined by default.