//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "loop-instsimplify"
-#include "llvm/Instructions.h"
-#include "llvm/Analysis/Dominators.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/ScalarEvolution.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Instructions.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetLibraryInfo.h"
-#include "llvm/Transforms/Scalar.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/ADT/Statistic.h"
using namespace llvm;
+#define DEBUG_TYPE "loop-instsimplify"
+
STATISTIC(NumSimplified, "Number of redundant instructions simplified");
namespace {
initializeLoopInstSimplifyPass(*PassRegistry::getPassRegistry());
}
- bool runOnLoop(Loop*, LPPassManager&);
+ bool runOnLoop(Loop*, LPPassManager&) override;
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
- AU.addRequired<LoopInfo>();
+ AU.addRequired<AssumptionCacheTracker>();
+ AU.addRequired<LoopInfoWrapperPass>();
AU.addRequiredID(LoopSimplifyID);
AU.addPreservedID(LoopSimplifyID);
AU.addPreservedID(LCSSAID);
- AU.addPreserved("scalar-evolution");
- AU.addRequired<TargetLibraryInfo>();
+ AU.addPreserved<ScalarEvolution>();
+ AU.addRequired<TargetLibraryInfoWrapperPass>();
}
};
}
char LoopInstSimplify::ID = 0;
INITIALIZE_PASS_BEGIN(LoopInstSimplify, "loop-instsimplify",
"Simplify instructions in loops", false, false)
-INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfo)
-INITIALIZE_PASS_DEPENDENCY(DominatorTree)
-INITIALIZE_PASS_DEPENDENCY(LoopInfo)
+INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(LCSSA)
INITIALIZE_PASS_END(LoopInstSimplify, "loop-instsimplify",
"Simplify instructions in loops", false, false)
}
bool LoopInstSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
- DominatorTree *DT = getAnalysisIfAvailable<DominatorTree>();
- LoopInfo *LI = &getAnalysis<LoopInfo>();
- const TargetData *TD = getAnalysisIfAvailable<TargetData>();
- const TargetLibraryInfo *TLI = &getAnalysis<TargetLibraryInfo>();
+ if (skipOptnoneFunction(L))
+ return false;
+
+ DominatorTreeWrapperPass *DTWP =
+ getAnalysisIfAvailable<DominatorTreeWrapperPass>();
+ DominatorTree *DT = DTWP ? &DTWP->getDomTree() : nullptr;
+ LoopInfo *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
+ const TargetLibraryInfo *TLI =
+ &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
+ auto &AC = getAnalysis<AssumptionCacheTracker>().getAssumptionCache(
+ *L->getHeader()->getParent());
SmallVector<BasicBlock*, 8> ExitBlocks;
L->getUniqueExitBlocks(ExitBlocks);
WorklistItem Item = VisitStack.pop_back_val();
BasicBlock *BB = Item.getPointer();
bool IsSubloopHeader = Item.getInt();
+ const DataLayout &DL = L->getHeader()->getModule()->getDataLayout();
// Simplify instructions in the current basic block.
for (BasicBlock::iterator BI = BB->begin(), BE = BB->end(); BI != BE;) {
// Don't bother simplifying unused instructions.
if (!I->use_empty()) {
- Value *V = SimplifyInstruction(I, TD, TLI, DT);
+ Value *V = SimplifyInstruction(I, DL, TLI, DT, &AC);
if (V && LI->replacementPreservesLCSSAForm(I, V)) {
// Mark all uses for resimplification next time round the loop.
- for (Value::use_iterator UI = I->use_begin(), UE = I->use_end();
- UI != UE; ++UI)
- Next->insert(cast<Instruction>(*UI));
+ for (User *U : I->users())
+ Next->insert(cast<Instruction>(U));
I->replaceAllUsesWith(V);
LocalChanged = true;
++NumSimplified;
}
}
- LocalChanged |= RecursivelyDeleteTriviallyDeadInstructions(I);
+ bool res = RecursivelyDeleteTriviallyDeadInstructions(I, TLI);
+ if (res) {
+ // RecursivelyDeleteTriviallyDeadInstruction can remove
+ // more than one instruction, so simply incrementing the
+ // iterator does not work. When instructions get deleted
+ // re-iterate instead.
+ BI = BB->begin(); BE = BB->end();
+ LocalChanged |= res;
+ }
if (IsSubloopHeader && !isa<PHINode>(I))
break;
for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE;
++SI) {
BasicBlock *SuccBB = *SI;
- if (!Visited.insert(SuccBB))
+ if (!Visited.insert(SuccBB).second)
continue;
const Loop *SuccLoop = LI->getLoopFor(SuccBB);
for (unsigned i = 0; i < SubLoopExitBlocks.size(); ++i) {
BasicBlock *ExitBB = SubLoopExitBlocks[i];
- if (LI->getLoopFor(ExitBB) == L && Visited.insert(ExitBB))
+ if (LI->getLoopFor(ExitBB) == L && Visited.insert(ExitBB).second)
VisitStack.push_back(WorklistItem(ExitBB, false));
}