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Emit warnings if vectorization is forced and fails.

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This patch modifies the existing DiagnosticInfo system to create a generic base
class that is inherited to produce diagnostic-based warnings. This is used by
the loop vectorizer to trigger a warning when vectorization is forced and
fails. Several tests have been added to verify this behavior.

Reviewed by: Arnold Schwaighofer


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213110 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tyler Nowicki
2014-07-16 00:36:00 +00:00
parent 7e752a311a
commit 77f03040d5
6 changed files with 199 additions and 28 deletions
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23
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -1086,6 +1086,23 @@ private:
MDNode *LoopID;
};
static void emitMissedWarning(Function *F, Loop *L,
const LoopVectorizeHints &LH) {
emitOptimizationRemarkMissed(F->getContext(), DEBUG_TYPE, *F,
L->getStartLoc(), LH.emitRemark());
if (LH.getForce() == LoopVectorizeHints::FK_Enabled) {
if (LH.getWidth() != 1)
emitLoopVectorizeWarning(
F->getContext(), *F, L->getStartLoc(),
"failed explicitly specified loop vectorization");
else if (LH.getUnroll() != 1)
emitLoopInterleaveWarning(
F->getContext(), *F, L->getStartLoc(),
"failed explicitly specified loop interleaving");
}
}
static void addInnerLoop(Loop &L, SmallVectorImpl<Loop *> &V) {
if (L.empty())
return V.push_back(&L);
@ -1241,8 +1258,7 @@ struct LoopVectorize : public FunctionPass {
LoopVectorizationLegality LVL(L, SE, DL, DT, TLI, F);
if (!LVL.canVectorize()) {
DEBUG(dbgs() << "LV: Not vectorizing: Cannot prove legality.\n");
emitOptimizationRemarkMissed(F->getContext(), DEBUG_TYPE, *F,
L->getStartLoc(), Hints.emitRemark());
emitMissedWarning(F, L, Hints);
return false;
}
@ -1276,8 +1292,7 @@ struct LoopVectorize : public FunctionPass {
emitOptimizationRemarkAnalysis(
F->getContext(), DEBUG_TYPE, *F, L->getStartLoc(),
"loop not vectorized due to NoImplicitFloat attribute");
emitOptimizationRemarkMissed(F->getContext(), DEBUG_TYPE, *F,
L->getStartLoc(), Hints.emitRemark());
emitMissedWarning(F, L, Hints);
return false;
}