Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.cpp

@@ -0,0 +1,62 @@
+//=- WebAssemblyMachineFunctionInfo.cpp - WebAssembly Machine Function Info -=//
+//
+//                     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 implements WebAssembly-specific per-machine-function
+/// information.
+///
+//===----------------------------------------------------------------------===//
+
+#include "WebAssemblyMachineFunctionInfo.h"
+#include "WebAssemblyISelLowering.h"
+#include "WebAssemblySubtarget.h"
+#include "llvm/CodeGen/Analysis.h"
+using namespace llvm;
+
+WebAssemblyFunctionInfo::~WebAssemblyFunctionInfo() {}
+
+void WebAssemblyFunctionInfo::initWARegs() {
+  assert(WARegs.empty());
+  unsigned Reg = UnusedReg;
+  WARegs.resize(MF.getRegInfo().getNumVirtRegs(), Reg);
+}
+
+void llvm::ComputeLegalValueVTs(const Function &F, const TargetMachine &TM,
+                                Type *Ty, SmallVectorImpl<MVT> &ValueVTs) {
+  const DataLayout &DL(F.getParent()->getDataLayout());
+  const WebAssemblyTargetLowering &TLI =
+      *TM.getSubtarget<WebAssemblySubtarget>(F).getTargetLowering();
+  SmallVector<EVT, 4> VTs;
+  ComputeValueVTs(TLI, DL, Ty, VTs);
+
+  for (EVT VT : VTs) {
+    unsigned NumRegs = TLI.getNumRegisters(F.getContext(), VT);
+    MVT RegisterVT = TLI.getRegisterType(F.getContext(), VT);
+    for (unsigned i = 0; i != NumRegs; ++i)
+      ValueVTs.push_back(RegisterVT);
+  }
+}
+
+void llvm::ComputeSignatureVTs(const Function &F, const TargetMachine &TM,
+                               SmallVectorImpl<MVT> &Params,
+                               SmallVectorImpl<MVT> &Results) {
+  ComputeLegalValueVTs(F, TM, F.getReturnType(), Results);
+
+  if (Results.size() > 1) {
+    // WebAssembly currently can't lower returns of multiple values without
+    // demoting to sret (see WebAssemblyTargetLowering::CanLowerReturn). So
+    // replace multiple return values with a pointer parameter.
+    Results.clear();
+    Params.push_back(
+        MVT::getIntegerVT(TM.createDataLayout().getPointerSizeInBits()));
+  }
+
+  for (auto &Arg : F.args())
+    ComputeLegalValueVTs(F, TM, Arg.getType(), Params);
+}