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BBVectorize should ignore unreachable blocks.

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Unreachable blocks can have invalid instructions. For example,
jump threading can produce self-referential instructions in
unreachable blocks. Also, we should not be spending time
optimizing unreachable code. Fixes PR14133.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166423 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2012-10-22 18:00:55 +00:00
parent e743942bc8
commit e29c19091c
2 changed files with 45 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Transforms/Vectorize/BBVectorize.cpp
+13
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@@ -34,6 +34,7 @@
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Analysis/ValueTracking.h"
@@ -177,6 +178,7 @@ namespace {
BBVectorize(Pass *P, const VectorizeConfig &C)
: BasicBlockPass(ID), Config(C) {
AA = &P->getAnalysis<AliasAnalysis>();
DT = &P->getAnalysis<DominatorTree>();
SE = &P->getAnalysis<ScalarEvolution>();
TD = P->getAnalysisIfAvailable<DataLayout>();
}
@@ -191,6 +193,7 @@ namespace {
VPPIteratorPair;
AliasAnalysis *AA;
DominatorTree *DT;
ScalarEvolution *SE;
DataLayout *TD;
@@ -330,6 +333,12 @@ namespace {
void combineMetadata(Instruction *K, const Instruction *J);
bool vectorizeBB(BasicBlock &BB) {
if (!DT->isReachableFromEntry(&BB)) {
DEBUG(dbgs() << "BBV: skipping unreachable " << BB.getName() <<
" in " << BB.getParent()->getName() << "\n");
return false;
}
bool changed = false;
// Iterate a sufficient number of times to merge types of size 1 bit,
// then 2 bits, then 4, etc. up to half of the target vector width of the
@@ -363,6 +372,7 @@ namespace {
virtual bool runOnBasicBlock(BasicBlock &BB) {
AA = &getAnalysis<AliasAnalysis>();
DT = &getAnalysis<DominatorTree>();
SE = &getAnalysis<ScalarEvolution>();
TD = getAnalysisIfAvailable<DataLayout>();
@@ -372,8 +382,10 @@ namespace {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
BasicBlockPass::getAnalysisUsage(AU);
AU.addRequired<AliasAnalysis>();
AU.addRequired<DominatorTree>();
AU.addRequired<ScalarEvolution>();
AU.addPreserved<AliasAnalysis>();
AU.addPreserved<DominatorTree>();
AU.addPreserved<ScalarEvolution>();
AU.setPreservesCFG();
}
@@ -2397,6 +2409,7 @@ char BBVectorize::ID = 0;
static const char bb_vectorize_name[] = "Basic-Block Vectorization";
INITIALIZE_PASS_BEGIN(BBVectorize, BBV_NAME, bb_vectorize_name, false, false)
INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
INITIALIZE_PASS_DEPENDENCY(DominatorTree)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
INITIALIZE_PASS_END(BBVectorize, BBV_NAME, bb_vectorize_name, false, false)