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/CodeGen/SelectionDAG/CallingConvLower.cpp b/lib/CodeGen/SelectionDAG/CallingConvLower.cpp
new file mode 100644
index 0000000..defbe34
--- /dev/null
+++ b/lib/CodeGen/SelectionDAG/CallingConvLower.cpp
@@ -0,0 +1,102 @@
+//===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the CCState class, used for lowering and implementing
+// calling conventions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/CallingConvLower.h"
+#include "llvm/CodeGen/SelectionDAGNodes.h"
+#include "llvm/Target/MRegisterInfo.h"
+#include "llvm/Target/TargetMachine.h"
+using namespace llvm;
+
+CCState::CCState(unsigned CC, bool isVarArg, const TargetMachine &tm,
+ SmallVector<CCValAssign, 16> &locs)
+ : CallingConv(CC), IsVarArg(isVarArg), TM(tm),
+ MRI(*TM.getRegisterInfo()), Locs(locs) {
+ // No stack is used.
+ StackOffset = 0;
+
+ UsedRegs.resize(MRI.getNumRegs());
+}
+
+
+/// MarkAllocated - Mark a register and all of its aliases as allocated.
+void CCState::MarkAllocated(unsigned Reg) {
+ UsedRegs[Reg/32] |= 1 << (Reg&31);
+
+ if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
+ for (; (Reg = *RegAliases); ++RegAliases)
+ UsedRegs[Reg/32] |= 1 << (Reg&31);
+}
+
+/// AnalyzeFormalArguments - Analyze an ISD::FORMAL_ARGUMENTS node,
+/// incorporating info about the formals into this state.
+void CCState::AnalyzeFormalArguments(SDNode *TheArgs, CCAssignFn Fn) {
+ unsigned NumArgs = TheArgs->getNumValues()-1;
+
+ for (unsigned i = 0; i != NumArgs; ++i) {
+ MVT::ValueType ArgVT = TheArgs->getValueType(i);
+ SDOperand FlagOp = TheArgs->getOperand(3+i);
+ unsigned ArgFlags = cast<ConstantSDNode>(FlagOp)->getValue();
+ if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
+ cerr << "Formal argument #" << i << " has unhandled type "
+ << MVT::getValueTypeString(ArgVT) << "\n";
+ abort();
+ }
+ }
+}
+
+/// AnalyzeReturn - Analyze the returned values of an ISD::RET node,
+/// incorporating info about the result values into this state.
+void CCState::AnalyzeReturn(SDNode *TheRet, CCAssignFn Fn) {
+ // Determine which register each value should be copied into.
+ for (unsigned i = 0, e = TheRet->getNumOperands() / 2; i != e; ++i) {
+ MVT::ValueType VT = TheRet->getOperand(i*2+1).getValueType();
+ if (Fn(i, VT, VT, CCValAssign::Full,
+ cast<ConstantSDNode>(TheRet->getOperand(i*2+2))->getValue(), *this)){
+ cerr << "Return operand #" << i << " has unhandled type "
+ << MVT::getValueTypeString(VT) << "\n";
+ abort();
+ }
+ }
+}
+
+
+/// AnalyzeCallOperands - Analyze an ISD::CALL node, incorporating info
+/// about the passed values into this state.
+void CCState::AnalyzeCallOperands(SDNode *TheCall, CCAssignFn Fn) {
+ unsigned NumOps = (TheCall->getNumOperands() - 5) / 2;
+ for (unsigned i = 0; i != NumOps; ++i) {
+ MVT::ValueType ArgVT = TheCall->getOperand(5+2*i).getValueType();
+ SDOperand FlagOp = TheCall->getOperand(5+2*i+1);
+ unsigned ArgFlags =cast<ConstantSDNode>(FlagOp)->getValue();
+ if (Fn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, *this)) {
+ cerr << "Call operand #" << i << " has unhandled type "
+ << MVT::getValueTypeString(ArgVT) << "\n";
+ abort();
+ }
+ }
+}
+
+/// AnalyzeCallResult - Analyze the return values of an ISD::CALL node,
+/// incorporating info about the passed values into this state.
+void CCState::AnalyzeCallResult(SDNode *TheCall, CCAssignFn Fn) {
+ for (unsigned i = 0, e = TheCall->getNumValues() - 1; i != e; ++i) {
+ MVT::ValueType VT = TheCall->getValueType(i);
+ if (Fn(i, VT, VT, CCValAssign::Full, 0, *this)) {
+ cerr << "Call result #" << i << " has unhandled type "
+ << MVT::getValueTypeString(VT) << "\n";
+ abort();
+ }
+ }
+}
+