It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/ValueMapper.cpp b/lib/Transforms/Utils/ValueMapper.cpp
new file mode 100644
index 0000000..0b8c5c2
--- /dev/null
+++ b/lib/Transforms/Utils/ValueMapper.cpp
@@ -0,0 +1,118 @@
+//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the MapValue function, which is shared by various parts of
+// the lib/Transforms/Utils library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ValueMapper.h"
+#include "llvm/Constants.h"
+#include "llvm/GlobalValue.h"
+#include "llvm/Instruction.h"
+using namespace llvm;
+
+Value *llvm::MapValue(const Value *V, ValueMapTy &VM) {
+ Value *&VMSlot = VM[V];
+ if (VMSlot) return VMSlot; // Does it exist in the map yet?
+
+ // NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
+ // DenseMap. This includes any recursive calls to MapValue.
+
+ // Global values do not need to be seeded into the ValueMap if they are using
+ // the identity mapping.
+ if (isa<GlobalValue>(V) || isa<InlineAsm>(V))
+ return VMSlot = const_cast<Value*>(V);
+
+ if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
+ if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
+ isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) ||
+ isa<UndefValue>(C))
+ return VMSlot = C; // Primitive constants map directly
+ else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
+ for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
+ Value *MV = MapValue(CA->getOperand(i), VM);
+ if (MV != CA->getOperand(i)) {
+ // This array must contain a reference to a global, make a new array
+ // and return it.
+ //
+ std::vector<Constant*> Values;
+ Values.reserve(CA->getNumOperands());
+ for (unsigned j = 0; j != i; ++j)
+ Values.push_back(CA->getOperand(j));
+ Values.push_back(cast<Constant>(MV));
+ for (++i; i != e; ++i)
+ Values.push_back(cast<Constant>(MapValue(CA->getOperand(i), VM)));
+ return VM[V] = ConstantArray::get(CA->getType(), Values);
+ }
+ }
+ return VM[V] = C;
+
+ } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
+ for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
+ Value *MV = MapValue(CS->getOperand(i), VM);
+ if (MV != CS->getOperand(i)) {
+ // This struct must contain a reference to a global, make a new struct
+ // and return it.
+ //
+ std::vector<Constant*> Values;
+ Values.reserve(CS->getNumOperands());
+ for (unsigned j = 0; j != i; ++j)
+ Values.push_back(CS->getOperand(j));
+ Values.push_back(cast<Constant>(MV));
+ for (++i; i != e; ++i)
+ Values.push_back(cast<Constant>(MapValue(CS->getOperand(i), VM)));
+ return VM[V] = ConstantStruct::get(CS->getType(), Values);
+ }
+ }
+ return VM[V] = C;
+
+ } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+ std::vector<Constant*> Ops;
+ for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
+ Ops.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM)));
+ return VM[V] = CE->getWithOperands(Ops);
+ } else if (ConstantVector *CP = dyn_cast<ConstantVector>(C)) {
+ for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) {
+ Value *MV = MapValue(CP->getOperand(i), VM);
+ if (MV != CP->getOperand(i)) {
+ // This vector value must contain a reference to a global, make a new
+ // vector constant and return it.
+ //
+ std::vector<Constant*> Values;
+ Values.reserve(CP->getNumOperands());
+ for (unsigned j = 0; j != i; ++j)
+ Values.push_back(CP->getOperand(j));
+ Values.push_back(cast<Constant>(MV));
+ for (++i; i != e; ++i)
+ Values.push_back(cast<Constant>(MapValue(CP->getOperand(i), VM)));
+ return VM[V] = ConstantVector::get(Values);
+ }
+ }
+ return VM[V] = C;
+
+ } else {
+ assert(0 && "Unknown type of constant!");
+ }
+ }
+
+ return 0;
+}
+
+/// RemapInstruction - Convert the instruction operands from referencing the
+/// current values into those specified by ValueMap.
+///
+void llvm::RemapInstruction(Instruction *I, ValueMapTy &ValueMap) {
+ for (unsigned op = 0, E = I->getNumOperands(); op != E; ++op) {
+ const Value *Op = I->getOperand(op);
+ Value *V = MapValue(Op, ValueMap);
+ assert(V && "Referenced value not in value map!");
+ I->setOperand(op, V);
+ }
+}