6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-09 13:33:17 +00:00
Code Issues Projects Releases Wiki Activity

Handle null a bit more carefully.

Browse Source 
Actually teach dsa about select instructions.  This doesn't affect the
graph in any way other than not setting a spurious U marker on pointer
nodes that are selected.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20324 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-02-25 01:27:48 +00:00
parent 38b5788544
commit 6e84bd7d59
1 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
lib/Analysis/DataStructure/Local.cpp
View File

@ -104,6 +104,7 @@ namespace {
void handleAlloc(AllocationInst &AI, bool isHeap);
void visitPHINode(PHINode &PN);
void visitSelectInst(SelectInst &SI);
void visitGetElementPtrInst(User &GEP);
void visitReturnInst(ReturnInst &RI);
@ -316,6 +317,14 @@ void GraphBuilder::visitPHINode(PHINode &PN) {
PNDest.mergeWith(getValueDest(*PN.getIncomingValue(i)));
}
void GraphBuilder::visitSelectInst(SelectInst &SI) {
if (!isPointerType(SI.getType())) return; // Only pointer Selects
DSNodeHandle &Dest = ScalarMap[&SI];
Dest.mergeWith(getValueDest(*SI.getOperand(1)));
Dest.mergeWith(getValueDest(*SI.getOperand(2)));
}
void GraphBuilder::visitGetElementPtrInst(User &GEP) {
DSNodeHandle Value = getValueDest(*GEP.getOperand(0));
if (Value.isNull())
@ -430,7 +439,8 @@ void GraphBuilder::visitGetElementPtrInst(User &GEP) {
void GraphBuilder::visitLoadInst(LoadInst &LI) {
DSNodeHandle Ptr = getValueDest(*LI.getOperand(0));
if (Ptr.getNode() == 0) return;
if (Ptr.isNull())
Ptr = createNode();
// Make that the node is read from...
Ptr.getNode()->setReadMarker();