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Add debug location information to the vectorizer debug statements.

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Patch by Zinovy Nis.

llvm-svn: 205705
This commit is contained in:
Eric Christopher 2014-04-07 12:32:17 +00:00
parent 78e03ba858
commit 06a9cfdefa
1 changed files with 29 additions and 5 deletions
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34
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -67,6 +67,7 @@
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
@ -84,6 +85,7 @@
#include "llvm/Support/BranchProbability.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/Transforms/Scalar.h"
@ -468,7 +470,25 @@ static void setDebugLocFromInst(IRBuilder<> &B, const Value *Ptr) {
else
B.SetCurrentDebugLocation(DebugLoc());
}
/// \return string containing a file name and a line # for the given
/// instruction.
static format_object3<const char *, const char *, unsigned>
getDebugLocString(const Instruction *I) {
if (!I)
return format<const char *, const char *, unsigned>("", "", "", 0U);
MDNode *N = I->getMetadata("dbg");
if (!N) {
const StringRef ModuleName =
I->getParent()->getParent()->getParent()->getModuleIdentifier();
return format<const char *, const char *, unsigned>("%s", ModuleName.data(),
"", 0U);
}
const DILocation Loc(N);
const unsigned LineNo = Loc.getLineNumber();
const char *DirName = Loc.getDirectory().data();
const char *FileName = Loc.getFilename().data();
return format("%s/%s:%u", DirName, FileName, LineNo);
}
/// LoopVectorizationLegality checks if it is legal to vectorize a loop, and
/// to what vectorization factor.
/// This class does not look at the profitability of vectorization, only the
@ -1065,8 +1085,10 @@ struct LoopVectorize : public FunctionPass {
bool processLoop(Loop *L) {
assert(L->empty() && "Only process inner loops.");
DEBUG(dbgs() << "LV: Checking a loop in \"" <<
L->getHeader()->getParent()->getName() << "\"\n");
DEBUG(dbgs() << "LV: Checking a loop in \""
<< L->getHeader()->getParent()->getName() << "\" from "
<< getDebugLocString(L->getHeader()->getFirstNonPHIOrDbg())
<< "\n");
LoopVectorizeHints Hints(L, DisableUnrolling);
@ -1129,8 +1151,10 @@ struct LoopVectorize : public FunctionPass {
unsigned UF = CM.selectUnrollFactor(OptForSize, Hints.Unroll, VF.Width,
VF.Cost);
DEBUG(dbgs() << "LV: Found a vectorizable loop ("<< VF.Width << ") in "<<
F->getParent()->getModuleIdentifier() << '\n');
DEBUG(dbgs() << "LV: Found a vectorizable loop ("
<< VF.Width << ") in "
<< getDebugLocString(L->getHeader()->getFirstNonPHIOrDbg())
<< '\n');
DEBUG(dbgs() << "LV: Unroll Factor is " << UF << '\n');
if (VF.Width == 1) {