6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-25 00:24:26 +00:00
Code Issues Projects Releases Wiki Activity

Lett users of sparse propagation do their own thing with phi nodes if they want

Browse Source 
to. This can be combined with LCSSA or SSI form to store more information on a
PHINode than can be computed by looking at its incoming values.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82317 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-09-19 18:33:36 +00:00
parent ad38936781
commit 875646f376
2 changed files with 13 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/llvm/Analysis/SparsePropagation.h
View File

@ -73,6 +73,12 @@ public:
return getOverdefinedVal(); // always safe return getOverdefinedVal(); // always safe
} }
/// IsSpecialCasedPHI - Given a PHI node, determine whether this PHI node is
/// one that the we want to handle through ComputeInstructionState.
virtual bool IsSpecialCasedPHI(PHINode *PN) {
return false;
}
/// GetConstant - If the specified lattice value is representable as an LLVM /// GetConstant - If the specified lattice value is representable as an LLVM
/// constant value, return it. Otherwise return null. The returned value /// constant value, return it. Otherwise return null. The returned value
/// must be in the same LLVM type as Val. /// must be in the same LLVM type as Val.

7
lib/Analysis/SparsePropagation.cpp
View File

@ -223,6 +223,13 @@ void SparseSolver::visitTerminatorInst(TerminatorInst &TI) {
} }
void SparseSolver::visitPHINode(PHINode &PN) { void SparseSolver::visitPHINode(PHINode &PN) {
if (LatticeFunc->IsSpecialCasedPHI(&PN)) {
LatticeVal IV = LatticeFunc->ComputeInstructionState(PN, *this);
if (IV != LatticeFunc->getUntrackedVal())
UpdateState(PN, IV);
return;
}
LatticeVal PNIV = getOrInitValueState(&PN); LatticeVal PNIV = getOrInitValueState(&PN);
LatticeVal Overdefined = LatticeFunc->getOverdefinedVal(); LatticeVal Overdefined = LatticeFunc->getOverdefinedVal();