summaryrefslogtreecommitdiffstats
path: root/lib/Transforms/Scalar/LICM.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/Transforms/Scalar/LICM.cpp')
-rw-r--r--lib/Transforms/Scalar/LICM.cpp79
1 files changed, 37 insertions, 42 deletions
diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp
index 14af38b..1333b02 100644
--- a/lib/Transforms/Scalar/LICM.cpp
+++ b/lib/Transforms/Scalar/LICM.cpp
@@ -38,6 +38,7 @@
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/ScalarEvolution.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constants.h"
@@ -52,7 +53,6 @@
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/LoopUtils.h"
#include "llvm/Transforms/Utils/SSAUpdater.h"
@@ -76,21 +76,21 @@ static bool isNotUsedInLoop(Instruction &I, Loop *CurLoop);
static bool hoist(Instruction &I, BasicBlock *Preheader);
static bool sink(Instruction &I, LoopInfo *LI, DominatorTree *DT,
Loop *CurLoop, AliasSetTracker *CurAST );
-static bool isGuaranteedToExecute(Instruction &Inst, DominatorTree *DT,
- Loop *CurLoop, LICMSafetyInfo * SafetyInfo);
-static bool isSafeToExecuteUnconditionally(Instruction &Inst,DominatorTree *DT,
- const DataLayout *DL, Loop *CurLoop,
- LICMSafetyInfo * SafetyInfo);
+static bool isGuaranteedToExecute(Instruction &Inst, DominatorTree *DT,
+ Loop *CurLoop, LICMSafetyInfo *SafetyInfo);
+static bool isSafeToExecuteUnconditionally(Instruction &Inst, DominatorTree *DT,
+ Loop *CurLoop,
+ LICMSafetyInfo *SafetyInfo);
static bool pointerInvalidatedByLoop(Value *V, uint64_t Size,
const AAMDNodes &AAInfo,
AliasSetTracker *CurAST);
static Instruction *CloneInstructionInExitBlock(Instruction &I,
BasicBlock &ExitBlock,
PHINode &PN, LoopInfo *LI);
-static bool canSinkOrHoistInst(Instruction &I, AliasAnalysis *AA,
- DominatorTree *DT, const DataLayout *DL,
- Loop *CurLoop, AliasSetTracker *CurAST,
- LICMSafetyInfo * SafetyInfo);
+static bool canSinkOrHoistInst(Instruction &I, AliasAnalysis *AA,
+ DominatorTree *DT, Loop *CurLoop,
+ AliasSetTracker *CurAST,
+ LICMSafetyInfo *SafetyInfo);
namespace {
struct LICM : public LoopPass {
@@ -130,7 +130,6 @@ namespace {
LoopInfo *LI; // Current LoopInfo
DominatorTree *DT; // Dominator Tree for the current Loop.
- const DataLayout *DL; // DataLayout for constant folding.
TargetLibraryInfo *TLI; // TargetLibraryInfo for constant folding.
// State that is updated as we process loops.
@@ -181,8 +180,6 @@ bool LICM::runOnLoop(Loop *L, LPPassManager &LPM) {
AA = &getAnalysis<AliasAnalysis>();
DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
- DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
- DL = DLP ? &DLP->getDataLayout() : nullptr;
TLI = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
assert(L->isLCSSAForm(*DT) && "Loop is not in LCSSA form.");
@@ -235,10 +232,10 @@ bool LICM::runOnLoop(Loop *L, LPPassManager &LPM) {
// instructions, we perform another pass to hoist them out of the loop.
//
if (L->hasDedicatedExits())
- Changed |= sinkRegion(DT->getNode(L->getHeader()), AA, LI, DT, DL, TLI,
- CurLoop, CurAST, &SafetyInfo);
+ Changed |= sinkRegion(DT->getNode(L->getHeader()), AA, LI, DT, TLI, CurLoop,
+ CurAST, &SafetyInfo);
if (Preheader)
- Changed |= hoistRegion(DT->getNode(L->getHeader()), AA, LI, DT, DL, TLI,
+ Changed |= hoistRegion(DT->getNode(L->getHeader()), AA, LI, DT, TLI,
CurLoop, CurAST, &SafetyInfo);
// Now that all loop invariants have been removed from the loop, promote any
@@ -291,10 +288,9 @@ bool LICM::runOnLoop(Loop *L, LPPassManager &LPM) {
/// first order w.r.t the DominatorTree. This allows us to visit uses before
/// definitions, allowing us to sink a loop body in one pass without iteration.
///
-bool llvm::sinkRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
- DominatorTree *DT, const DataLayout *DL,
- TargetLibraryInfo *TLI, Loop *CurLoop,
- AliasSetTracker *CurAST, LICMSafetyInfo * SafetyInfo) {
+bool llvm::sinkRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
+ DominatorTree *DT, TargetLibraryInfo *TLI, Loop *CurLoop,
+ AliasSetTracker *CurAST, LICMSafetyInfo *SafetyInfo) {
// Verify inputs.
assert(N != nullptr && AA != nullptr && LI != nullptr &&
@@ -311,8 +307,8 @@ bool llvm::sinkRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
// We are processing blocks in reverse dfo, so process children first.
const std::vector<DomTreeNode*> &Children = N->getChildren();
for (unsigned i = 0, e = Children.size(); i != e; ++i)
- Changed |= sinkRegion(Children[i], AA, LI, DT, DL, TLI, CurLoop,
- CurAST, SafetyInfo);
+ Changed |=
+ sinkRegion(Children[i], AA, LI, DT, TLI, CurLoop, CurAST, SafetyInfo);
// Only need to process the contents of this block if it is not part of a
// subloop (which would already have been processed).
if (inSubLoop(BB,CurLoop,LI)) return Changed;
@@ -336,8 +332,8 @@ bool llvm::sinkRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
// outside of the loop. In this case, it doesn't even matter if the
// operands of the instruction are loop invariant.
//
- if (isNotUsedInLoop(I, CurLoop) &&
- canSinkOrHoistInst(I, AA, DT, DL, CurLoop, CurAST, SafetyInfo)) {
+ if (isNotUsedInLoop(I, CurLoop) &&
+ canSinkOrHoistInst(I, AA, DT, CurLoop, CurAST, SafetyInfo)) {
++II;
Changed |= sink(I, LI, DT, CurLoop, CurAST);
}
@@ -350,10 +346,9 @@ bool llvm::sinkRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
/// order w.r.t the DominatorTree. This allows us to visit definitions before
/// uses, allowing us to hoist a loop body in one pass without iteration.
///
-bool llvm::hoistRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
- DominatorTree *DT, const DataLayout *DL,
- TargetLibraryInfo *TLI, Loop *CurLoop,
- AliasSetTracker *CurAST, LICMSafetyInfo *SafetyInfo) {
+bool llvm::hoistRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
+ DominatorTree *DT, TargetLibraryInfo *TLI, Loop *CurLoop,
+ AliasSetTracker *CurAST, LICMSafetyInfo *SafetyInfo) {
// Verify inputs.
assert(N != nullptr && AA != nullptr && LI != nullptr &&
DT != nullptr && CurLoop != nullptr && CurAST != nullptr &&
@@ -372,7 +367,8 @@ bool llvm::hoistRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
// Try constant folding this instruction. If all the operands are
// constants, it is technically hoistable, but it would be better to just
// fold it.
- if (Constant *C = ConstantFoldInstruction(&I, DL, TLI)) {
+ if (Constant *C = ConstantFoldInstruction(
+ &I, I.getModule()->getDataLayout(), TLI)) {
DEBUG(dbgs() << "LICM folding inst: " << I << " --> " << *C << '\n');
CurAST->copyValue(&I, C);
CurAST->deleteValue(&I);
@@ -385,16 +381,16 @@ bool llvm::hoistRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
// if all of the operands of the instruction are loop invariant and if it
// is safe to hoist the instruction.
//
- if (CurLoop->hasLoopInvariantOperands(&I) &&
- canSinkOrHoistInst(I, AA, DT, DL, CurLoop, CurAST, SafetyInfo) &&
- isSafeToExecuteUnconditionally(I, DT, DL, CurLoop, SafetyInfo))
+ if (CurLoop->hasLoopInvariantOperands(&I) &&
+ canSinkOrHoistInst(I, AA, DT, CurLoop, CurAST, SafetyInfo) &&
+ isSafeToExecuteUnconditionally(I, DT, CurLoop, SafetyInfo))
Changed |= hoist(I, CurLoop->getLoopPreheader());
}
const std::vector<DomTreeNode*> &Children = N->getChildren();
for (unsigned i = 0, e = Children.size(); i != e; ++i)
- Changed |= hoistRegion(Children[i], AA, LI, DT, DL, TLI, CurLoop,
- CurAST, SafetyInfo);
+ Changed |=
+ hoistRegion(Children[i], AA, LI, DT, TLI, CurLoop, CurAST, SafetyInfo);
return Changed;
}
@@ -424,10 +420,9 @@ void llvm::computeLICMSafetyInfo(LICMSafetyInfo * SafetyInfo, Loop * CurLoop) {
/// canSinkOrHoistInst - Return true if the hoister and sinker can handle this
/// instruction.
///
-bool canSinkOrHoistInst(Instruction &I, AliasAnalysis *AA,
- DominatorTree *DT, const DataLayout *DL,
- Loop *CurLoop, AliasSetTracker *CurAST,
- LICMSafetyInfo * SafetyInfo) {
+bool canSinkOrHoistInst(Instruction &I, AliasAnalysis *AA, DominatorTree *DT,
+ Loop *CurLoop, AliasSetTracker *CurAST,
+ LICMSafetyInfo *SafetyInfo) {
// Loads have extra constraints we have to verify before we can hoist them.
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
if (!LI->isUnordered())
@@ -487,7 +482,7 @@ bool canSinkOrHoistInst(Instruction &I, AliasAnalysis *AA,
!isa<InsertValueInst>(I))
return false;
- return isSafeToExecuteUnconditionally(I, DT, DL, CurLoop, SafetyInfo);
+ return isSafeToExecuteUnconditionally(I, DT, CurLoop, SafetyInfo);
}
/// Returns true if a PHINode is a trivially replaceable with an
@@ -643,10 +638,10 @@ static bool hoist(Instruction &I, BasicBlock *Preheader) {
/// or if it is a trapping instruction and is guaranteed to execute.
///
static bool isSafeToExecuteUnconditionally(Instruction &Inst, DominatorTree *DT,
- const DataLayout *DL, Loop *CurLoop,
- LICMSafetyInfo * SafetyInfo) {
+ Loop *CurLoop,
+ LICMSafetyInfo *SafetyInfo) {
// If it is not a trapping instruction, it is always safe to hoist.
- if (isSafeToSpeculativelyExecute(&Inst, DL))
+ if (isSafeToSpeculativelyExecute(&Inst))
return true;
return isGuaranteedToExecute(Inst, DT, CurLoop, SafetyInfo);
generated by cgit v1.1 at 2024-06-14 18:36:15 +0000