1 files changed, 83 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.cpp b/contrib/llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.cpp
new file mode 100644
index 000000000000..b3ce4bd27460
--- /dev/null
+++ b/contrib/llvm/lib/Target/WebAssembly/WebAssemblyTargetTransformInfo.cpp
@@ -0,0 +1,83 @@
+//===-- WebAssemblyTargetTransformInfo.cpp - WebAssembly-specific TTI -----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file defines the WebAssembly-specific TargetTransformInfo
+/// implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "WebAssemblyTargetTransformInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Target/CostTable.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "wasmtti"
+
+TargetTransformInfo::PopcntSupportKind
+WebAssemblyTTIImpl::getPopcntSupport(unsigned TyWidth) const {
+  assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
+  return TargetTransformInfo::PSK_FastHardware;
+}
+
+unsigned WebAssemblyTTIImpl::getNumberOfRegisters(bool Vector) {
+  unsigned Result = BaseT::getNumberOfRegisters(Vector);
+
+  // For SIMD, use at least 16 registers, as a rough guess.
+  if (Vector)
+    Result = std::max(Result, 16u);
+
+  return Result;
+}
+
+unsigned WebAssemblyTTIImpl::getRegisterBitWidth(bool Vector) const {
+  if (Vector && getST()->hasSIMD128())
+    return 128;
+
+  return 64;
+}
+
+unsigned WebAssemblyTTIImpl::getArithmeticInstrCost(
+    unsigned Opcode, Type *Ty, TTI::OperandValueKind Opd1Info,
+    TTI::OperandValueKind Opd2Info, TTI::OperandValueProperties Opd1PropInfo,
+    TTI::OperandValueProperties Opd2PropInfo, ArrayRef<const Value *> Args) {
+
+  unsigned Cost = BasicTTIImplBase<WebAssemblyTTIImpl>::getArithmeticInstrCost(
+      Opcode, Ty, Opd1Info, Opd2Info, Opd1PropInfo, Opd2PropInfo);
+
+  if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
+    switch (Opcode) {
+    case Instruction::LShr:
+    case Instruction::AShr:
+    case Instruction::Shl:
+      // SIMD128's shifts currently only accept a scalar shift count. For each
+      // element, we'll need to extract, op, insert. The following is a rough
+      // approxmation.
+      if (Opd2Info != TTI::OK_UniformValue &&
+          Opd2Info != TTI::OK_UniformConstantValue)
+        Cost = VTy->getNumElements() *
+               (TargetTransformInfo::TCC_Basic +
+                getArithmeticInstrCost(Opcode, VTy->getElementType()) +
+                TargetTransformInfo::TCC_Basic);
+      break;
+    }
+  }
+  return Cost;
+}
+
+unsigned WebAssemblyTTIImpl::getVectorInstrCost(unsigned Opcode, Type *Val,
+                                                unsigned Index) {
+  unsigned Cost = BasicTTIImplBase::getVectorInstrCost(Opcode, Val, Index);
+
+  // SIMD128's insert/extract currently only take constant indices.
+  if (Index == -1u)
+    return Cost + 25 * TargetTransformInfo::TCC_Expensive;
+
+  return Cost;
+}