Changes in directory llvm/lib/Transforms/Scalar:
IndVarSimplify.cpp updated: 1.100 -> 1.101
---
Log message:
add -debug output for -indvars.
---
Diffs of the changes: (+19 -6)
IndVarSimplify.cpp | 25 +++++++++++++++++++------
1 files changed, 19 insertions(+), 6 deletions(-)
Index: llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
diff -u llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:1.100
llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:1.101
--- llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:1.100 Sat Dec 30 23:48:39 2006
+++ llvm/lib/Transforms/Scalar/IndVarSimplify.cpp Sat Jan 6 19:14:12 2007
@@ -46,6 +46,7 @@
#include "llvm/Analysis/ScalarEvolutionExpander.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Support/CFG.h"
+#include "llvm/Support/Debug.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Support/CommandLine.h"
@@ -113,6 +114,7 @@
if (Instruction *U = dyn_cast<Instruction>(I->getOperand(i)))
Insts.insert(U);
SE->deleteInstructionFromRecords(I);
+ DOUT << "INDVARS: Deleting: " << *I;
I->eraseFromParent();
Changed = true;
}
@@ -133,7 +135,8 @@
dyn_cast<GetElementPtrInst>(PN->getIncomingValue(BackedgeIdx)))
if (GEPI->getOperand(0) == PN) {
assert(GEPI->getNumOperands() == 2 && "GEP types must match!");
-
+ DOUT << "INDVARS: Eliminating pointer recurrence: " << *GEPI;
+
// Okay, we found a pointer recurrence. Transform this pointer
// recurrence into an integer recurrence. Compute the value that gets
// added to the pointer at every iteration.
@@ -265,6 +268,9 @@
// We have to use the preincremented value...
IndVar = L->getCanonicalInductionVariable();
}
+
+ DOUT << "INDVARS: LFTR: TripCount = " << *TripCount
+ << " IndVar = " << *IndVar << "\n";
// Expand the code for the iteration count into the preheader of the loop.
BasicBlock *Preheader = L->getLoopPreheader();
@@ -359,6 +365,9 @@
Value *NewVal = Rewriter.expandCodeFor(ExitValue, InsertPt,
I->getType());
+ DOUT << "INDVARS: RLEV: AfterLoopVal = " << *NewVal
+ << " LoopVal = " << *I << "\n";
+
// Rewrite any users of the computed value outside of the loop
// with the newly computed value.
for (unsigned i = 0, e = ExtraLoopUsers.size(); i != e; ++i) {
@@ -502,6 +511,7 @@
Value *IndVar =
Rewriter.getOrInsertCanonicalInductionVariable(L,LargestType);
++NumInserted;
Changed = true;
+ DOUT << "INDVARS: New CanIV: " << *IndVar;
if (!isa<SCEVCouldNotCompute>(IterationCount))
if (Instruction *DI = LinearFunctionTestReplace(L,
IterationCount,Rewriter))
@@ -523,20 +533,23 @@
if (!InsertedSizes[IndVars[i].first->getType()->getPrimitiveSize()]) {
PHINode *PN = IndVars[i].first;
InsertedSizes[PN->getType()->getPrimitiveSize()] = true;
- Instruction *New = CastInst::create(Instruction::Trunc, IndVar,
- PN->getType(), "indvar", InsertPt);
+ Instruction *New = new TruncInst(IndVar, PN->getType(), "indvar",
+ InsertPt);
Rewriter.addInsertedValue(New, SE->getSCEV(New));
+ DOUT << "INDVARS: Made trunc IV for " << *PN
+ << " NewVal = " << *New << "\n";
}
}
- // If there were induction variables of other sizes, cast the primary
- // induction variable to the right size for them, avoiding the need for the
- // code evaluation methods to insert induction variables of different sizes.
+ // Rewrite all induction variables in terms of the canonical induction
+ // variable.
std::map<unsigned, Value*> InsertedSizes;
while (!IndVars.empty()) {
PHINode *PN = IndVars.back().first;
Value *NewVal = Rewriter.expandCodeFor(IndVars.back().second, InsertPt,
PN->getType());
+ DOUT << "INDVARS: Rewrote IV '" << *IndVars.back().second << "' " << *PN
+ << " into = " << *NewVal << "\n";
std::string Name = PN->getName();
PN->setName("");
NewVal->setName(Name);
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