//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "AMDGPUtti"
-#include "AMDGPU.h"
-#include "AMDGPUTargetMachine.h"
+#include "AMDGPUTargetTransformInfo.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/Support/Debug.h"
#include "llvm/Target/CostTable.h"
#include "llvm/Target/TargetLowering.h"
using namespace llvm;
-// Declare the pass initialization routine locally as target-specific passes
-// don't have a target-wide initialization entry point, and so we rely on the
-// pass constructor initialization.
-namespace llvm {
-void initializeAMDGPUTTIPass(PassRegistry &);
-}
-
-namespace {
-
-class AMDGPUTTI final : public ImmutablePass, public TargetTransformInfo {
- const AMDGPUTargetMachine *TM;
- const AMDGPUSubtarget *ST;
- const AMDGPUTargetLowering *TLI;
-
- /// Estimate the overhead of scalarizing an instruction. Insert and Extract
- /// are set if the result needs to be inserted and/or extracted from vectors.
- unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const;
-
-public:
- AMDGPUTTI() : ImmutablePass(ID), TM(0), ST(0), TLI(0) {
- llvm_unreachable("This pass cannot be directly constructed");
- }
-
- AMDGPUTTI(const AMDGPUTargetMachine *TM)
- : ImmutablePass(ID), TM(TM), ST(TM->getSubtargetImpl()),
- TLI(TM->getTargetLowering()) {
- initializeAMDGPUTTIPass(*PassRegistry::getPassRegistry());
- }
-
- virtual void initializePass() override { pushTTIStack(this); }
-
- virtual void finalizePass() { popTTIStack(); }
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const override {
- TargetTransformInfo::getAnalysisUsage(AU);
- }
-
- /// Pass identification.
- static char ID;
-
- /// Provide necessary pointer adjustments for the two base classes.
- virtual void *getAdjustedAnalysisPointer(const void *ID) override {
- if (ID == &TargetTransformInfo::ID)
- return (TargetTransformInfo *)this;
- return this;
- }
-
- virtual bool hasBranchDivergence() const override;
-
- virtual void getUnrollingPreferences(Loop *L, UnrollingPreferences &UP) const;
-
- /// @}
-};
-
-} // end anonymous namespace
-
-INITIALIZE_AG_PASS(AMDGPUTTI, TargetTransformInfo, "AMDGPUtti",
- "AMDGPU Target Transform Info", true, true, false)
-char AMDGPUTTI::ID = 0;
+#define DEBUG_TYPE "AMDGPUtti"
-ImmutablePass *
-llvm::createAMDGPUTargetTransformInfoPass(const AMDGPUTargetMachine *TM) {
- return new AMDGPUTTI(TM);
-}
+void AMDGPUTTIImpl::getUnrollingPreferences(Loop *L,
+ TTI::UnrollingPreferences &UP) {
+ UP.Threshold = 300; // Twice the default.
+ UP.MaxCount = UINT_MAX;
+ UP.Partial = true;
-bool AMDGPUTTI::hasBranchDivergence() const { return true; }
+ // TODO: Do we want runtime unrolling?
-void AMDGPUTTI::getUnrollingPreferences(Loop *L,
- UnrollingPreferences &UP) const {
- for (Loop::block_iterator BI = L->block_begin(), BE = L->block_end();
- BI != BE; ++BI) {
- BasicBlock *BB = *BI;
- for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
- I != E; ++I) {
- const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(I);
- if (!GEP)
+ for (const BasicBlock *BB : L->getBlocks()) {
+ for (const Instruction &I : *BB) {
+ const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&I);
+ if (!GEP || GEP->getAddressSpace() != AMDGPUAS::PRIVATE_ADDRESS)
continue;
+
const Value *Ptr = GEP->getPointerOperand();
const AllocaInst *Alloca = dyn_cast<AllocaInst>(GetUnderlyingObject(Ptr));
if (Alloca) {
// require us to use indirect addressing, which is slow and prone to
// compiler bugs. If this loop does an address calculation on an
// alloca ptr, then we want to use a higher than normal loop unroll
- // threshold. This will give SROA a better chance to eliminate these
- // allocas.
- //
- // Don't use the maximum allowed value here as it will make some
- // programs way too big.
- UP.Threshold = 500;
+ // threshold. This will give SROA a better chance to eliminate these
+ // allocas.
+ //
+ // Don't use the maximum allowed value here as it will make some
+ // programs way too big.
+ UP.Threshold = 800;
}
}
}
}
+
+unsigned AMDGPUTTIImpl::getNumberOfRegisters(bool Vec) {
+ if (Vec)
+ return 0;
+
+ // Number of VGPRs on SI.
+ if (ST->getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS)
+ return 256;
+
+ return 4 * 128; // XXX - 4 channels. Should these count as vector instead?
+}
+
+unsigned AMDGPUTTIImpl::getRegisterBitWidth(bool) { return 32; }
+
+unsigned AMDGPUTTIImpl::getMaxInterleaveFactor() {
+ // Semi-arbitrary large amount.
+ return 64;
+}