Imported Upstream version 5.18.0.247

Former-commit-id: 2d6af2e4ed0eda5cbdc2946446ef7718456ad190

external/llvm/lib/Transforms/Utils/StripGCRelocates.cpp

@@ -1,80 +0,0 @@
-//===- StripGCRelocates.cpp - Remove gc.relocates inserted by RewriteStatePoints===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This is a little utility pass that removes the gc.relocates inserted by
-// RewriteStatepointsForGC. Note that the generated IR is incorrect,
-// but this is useful as a single pass in itself, for analysis of IR, without
-// the GC.relocates. The statepoint and gc.result instrinsics would still be
-// present.
-//===----------------------------------------------------------------------===//
-
-#include "llvm/IR/Function.h"
-#include "llvm/IR/InstIterator.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Statepoint.h"
-#include "llvm/IR/Type.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/Scalar.h"
-
-using namespace llvm;
-
-namespace {
-struct StripGCRelocates : public FunctionPass {
-  static char ID; // Pass identification, replacement for typeid
-  StripGCRelocates() : FunctionPass(ID) {
-    initializeStripGCRelocatesPass(*PassRegistry::getPassRegistry());
-  }
-
-  void getAnalysisUsage(AnalysisUsage &Info) const override {}
-
-  bool runOnFunction(Function &F) override;
-
-};
-char StripGCRelocates::ID = 0;
-}
-
-bool StripGCRelocates::runOnFunction(Function &F) {
-  // Nothing to do for declarations.
-  if (F.isDeclaration())
-    return false;
-  SmallVector<GCRelocateInst *, 20> GCRelocates;
-  // TODO: We currently do not handle gc.relocates that are in landing pads,
-  // i.e. not bound to a single statepoint token.
-  for (Instruction &I : instructions(F)) {
-    if (auto *GCR = dyn_cast<GCRelocateInst>(&I))
-      if (isStatepoint(GCR->getOperand(0)))
-        GCRelocates.push_back(GCR);
-  }
-  // All gc.relocates are bound to a single statepoint token. The order of
-  // visiting gc.relocates for deletion does not matter.
-  for (GCRelocateInst *GCRel : GCRelocates) {
-    Value *OrigPtr = GCRel->getDerivedPtr();
-    Value *ReplaceGCRel = OrigPtr;
-
-    // All gc_relocates are i8 addrspace(1)* typed, we need a bitcast from i8
-    // addrspace(1)* to the type of the OrigPtr, if the are not the same.
-    if (GCRel->getType() != OrigPtr->getType())
-      ReplaceGCRel = new BitCastInst(OrigPtr, GCRel->getType(), "cast", GCRel);
-
-    // Replace all uses of gc.relocate and delete the gc.relocate
-    // There maybe unncessary bitcasts back to the OrigPtr type, an instcombine
-    // pass would clear this up.
-    GCRel->replaceAllUsesWith(ReplaceGCRel);
-    GCRel->eraseFromParent();
-  }
-  return !GCRelocates.empty();
-}
-
-INITIALIZE_PASS(StripGCRelocates, "strip-gc-relocates",
-                "Strip gc.relocates inserted through RewriteStatepointsForGC",
-                true, false)
-FunctionPass *llvm::createStripGCRelocatesPass() {
-  return new StripGCRelocates();
-}