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Initial implementation of the nodes in a SelectionDAG.
llvm-svn: 19325
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include/llvm/CodeGen/SelectionDAGNodes.h
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include/llvm/CodeGen/SelectionDAGNodes.h
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//===-- llvm/CodeGen/SelectionDAGNodes.h - SelectionDAG Nodes ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the SDNode class and derived classes, which are used to
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// represent the nodes and operations present in a SelectionDAG. These nodes
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// and operations are machine code level operations, with some similarities to
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// the GCC RTL representation.
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//
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// Clients should include the SelectionDAG.h file instead of this file directly.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_SELECTIONDAGNODES_H
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#define LLVM_CODEGEN_SELECTIONDAGNODES_H
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#include "llvm/CodeGen/ValueTypes.h"
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#include <cassert>
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#include <vector>
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namespace llvm {
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class SelectionDAG;
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class GlobalValue;
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class MachineBasicBlock;
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class SDNode;
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template <typename T> struct simplify_type;
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/// ISD namespace - This namespace contains an enum which represents all of the
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/// SelectionDAG node types and value types.
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///
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namespace ISD {
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//===--------------------------------------------------------------------===//
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/// ISD::NodeType enum - This enum defines all of the operators valid in a
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/// SelectionDAG.
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///
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enum NodeType {
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// Leaf nodes
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EntryToken, Constant, ConstantFP, GlobalAddress, FrameIndex, ConstantPool,
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BasicBlock, ExternalSymbol,
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// CopyToReg - This node has chain and child nodes, and an associated
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// register number. The instruction selector must guarantee that the value
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// of the value node is available in the virtual register stored in the
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// CopyRegSDNode object.
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CopyToReg,
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// CopyFromReg - This node indicates that the input value is a virtual or
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// physical register that is defined outside of the scope of this
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// SelectionDAG. The virtual register is available from the
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// CopyRegSDNode object.
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CopyFromReg,
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// EXTRACT_ELEMENT - This is used to get the first or second (determined by
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// a Constant, which is required to be operand #1), element of the aggregate
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// value specified as operand #0. This is only for use before legalization,
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// for values that will be broken into multiple registers.
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EXTRACT_ELEMENT,
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// BUILD_PAIR - This is the opposite of EXTRACT_ELEMENT in some ways. Given
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// two values of the same integer value type, this produces a value twice as
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// big. Like EXTRACT_ELEMENT, this can only be used before legalization.
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BUILD_PAIR,
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// Simple binary arithmetic operators.
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ADD, SUB, MUL, SDIV, UDIV, SREM, UREM,
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// Bitwise operators.
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AND, OR, XOR, SHL, SRA, SRL,
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// Select operator.
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SELECT,
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// SetCC operator - This evaluates to a boolean (i1) true value if the
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// condition is true. These nodes are instances of the
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// SetCCSDNode class, which contains the condition code as extra
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// state.
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SETCC,
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// addc - Three input, two output operator: (X, Y, C) -> (X+Y+C,
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// Cout). X,Y are integer inputs of agreeing size, C is a one bit
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// value, and two values are produced: the sum and a carry out.
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ADDC, SUBB,
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// Conversion operators. These are all single input single output
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// operations. For all of these, the result type must be strictly
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// wider or narrower (depending on the operation) than the source
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// type.
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// SIGN_EXTEND - Used for integer types, replicating the sign bit
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// into new bits.
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SIGN_EXTEND,
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// ZERO_EXTEND - Used for integer types, zeroing the new bits.
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ZERO_EXTEND,
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// TRUNCATE - Completely drop the high bits.
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TRUNCATE,
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// FP_ROUND - Perform a rounding operation from the current
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// precision down to the specified precision.
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FP_ROUND,
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// FP_EXTEND - Extend a smaller FP type into a larger FP type.
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FP_EXTEND,
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// Other operators. LOAD and STORE have token chains.
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LOAD, STORE,
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// DYNAMIC_STACKALLOC - Allocate some number of bytes on the stack aligned
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// to a specified boundary. The first operand is the token chain, the
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// second is the number of bytes to allocate, and the third is the alignment
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// boundary.
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DYNAMIC_STACKALLOC,
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// Control flow instructions. These all have token chains.
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// BR - Unconditional branch. The first operand is the chain
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// operand, the second is the MBB to branch to.
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BR,
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// BRCOND - Conditional branch. The first operand is the chain,
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// the second is the condition, the third is the block to branch
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// to if the condition is true.
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BRCOND,
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// RET - Return from function. The first operand is the chain,
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// and any subsequent operands are the return values for the
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// function. This operation can have variable number of operands.
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RET,
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// CALL - Call to a function pointer. The first operand is the chain, the
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// second is the destination function pointer (a GlobalAddress for a direct
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// call). Arguments have already been lowered to explicit DAGs according to
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// the calling convention in effect here.
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CALL,
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// ADJCALLSTACKDOWN/ADJCALLSTACKUP - These operators mark the beginning and
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// end of a call sequence and indicate how much the stack pointer needs to
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// be adjusted for that particular call. The first operand is a chain, the
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// second is a ConstantSDNode of intptr type.
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ADJCALLSTACKDOWN, // Beginning of a call sequence
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ADJCALLSTACKUP, // End of a call sequence
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// BUILTIN_OP_END - This must be the last enum value in this list.
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BUILTIN_OP_END,
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};
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//===--------------------------------------------------------------------===//
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/// ISD::CondCode enum - These are ordered carefully to make the bitfields
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/// below work out, when considering SETFALSE (something that never exists
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/// dynamically) as 0. "U" -> Unsigned (for integer operands) or Unordered
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/// (for floating point), "L" -> Less than, "G" -> Greater than, "E" -> Equal
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/// to. If the "N" column is 1, the result of the comparison is undefined if
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/// the input is a NAN.
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///
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/// All of these (except for the 'always folded ops') should be handled for
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/// floating point. For integer, only the SETEQ,SETNE,SETLT,SETLE,SETGT,
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/// SETGE,SETULT,SETULE,SETUGT, and SETUGE opcodes are used.
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///
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/// Note that these are laid out in a specific order to allow bit-twiddling
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/// to transform conditions.
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enum CondCode {
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// Opcode N U L G E Intuitive operation
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SETFALSE, // 0 0 0 0 Always false (always folded)
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SETOEQ, // 0 0 0 1 True if ordered and equal
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SETOGT, // 0 0 1 0 True if ordered and greater than
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SETOGE, // 0 0 1 1 True if ordered and greater than or equal
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SETOLT, // 0 1 0 0 True if ordered and less than
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SETOLE, // 0 1 0 1 True if ordered and less than or equal
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SETONE, // 0 1 1 0 True if ordered and operands are unequal
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SETO, // 0 1 1 1 True if ordered (no nans)
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SETUO, // 1 0 0 0 True if unordered: isnan(X) | isnan(Y)
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SETUEQ, // 1 0 0 1 True if unordered or equal
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SETUGT, // 1 0 1 0 True if unordered or greater than
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SETUGE, // 1 0 1 1 True if unordered, greater than, or equal
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SETULT, // 1 1 0 0 True if unordered or less than
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SETULE, // 1 1 0 1 True if unordered, less than, or equal
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SETUNE, // 1 1 1 0 True if unordered or not equal
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SETTRUE, // 1 1 1 1 Always true (always folded)
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// Don't care operations: undefined if the input is a nan.
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SETFALSE2, // 1 X 0 0 0 Always false (always folded)
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SETEQ, // 1 X 0 0 1 True if equal
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SETGT, // 1 X 0 1 0 True if greater than
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SETGE, // 1 X 0 1 1 True if greater than or equal
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SETLT, // 1 X 1 0 0 True if less than
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SETLE, // 1 X 1 0 1 True if less than or equal
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SETNE, // 1 X 1 1 0 True if not equal
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SETTRUE2, // 1 X 1 1 1 Always true (always folded)
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SETCC_INVALID, // Marker value.
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};
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/// isSignedIntSetCC - Return true if this is a setcc instruction that
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/// performs a signed comparison when used with integer operands.
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inline bool isSignedIntSetCC(CondCode Code) {
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return Code == SETGT || Code == SETGE || Code == SETLT || Code == SETLE;
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}
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/// isUnsignedIntSetCC - Return true if this is a setcc instruction that
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/// performs an unsigned comparison when used with integer operands.
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inline bool isUnsignedIntSetCC(CondCode Code) {
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return Code == SETUGT || Code == SETUGE || Code == SETULT || Code == SETULE;
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}
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/// isTrueWhenEqual - Return true if the specified condition returns true if
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/// the two operands to the condition are equal. Note that if one of the two
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/// operands is a NaN, this value is meaningless.
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inline bool isTrueWhenEqual(CondCode Cond) {
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return ((int)Cond & 1) != 0;
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}
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/// getUnorderedFlavor - This function returns 0 if the condition is always
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/// false if an operand is a NaN, 1 if the condition is always true if the
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/// operand is a NaN, and 2 if the condition is undefined if the operand is a
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/// NaN.
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inline unsigned getUnorderedFlavor(CondCode Cond) {
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return ((int)Cond >> 3) & 3;
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}
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/// getSetCCInverse - Return the operation corresponding to !(X op Y), where
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/// 'op' is a valid SetCC operation.
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CondCode getSetCCInverse(CondCode Operation, bool isInteger);
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/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
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/// when given the operation for (X op Y).
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CondCode getSetCCSwappedOperands(CondCode Operation);
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/// getSetCCOrOperation - Return the result of a logical OR between different
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/// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This
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/// function returns SETCC_INVALID if it is not possible to represent the
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/// resultant comparison.
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CondCode getSetCCOrOperation(CondCode Op1, CondCode Op2, bool isInteger);
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/// getSetCCAndOperation - Return the result of a logical AND between
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/// different comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
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/// function returns SETCC_INVALID if it is not possible to represent the
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/// resultant comparison.
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CondCode getSetCCAndOperation(CondCode Op1, CondCode Op2, bool isInteger);
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} // end llvm::ISD namespace
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//===----------------------------------------------------------------------===//
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/// SDOperand - Unlike LLVM values, Selection DAG nodes may return multiple
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/// values as the result of a computation. Many nodes return multiple values,
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/// from loads (which define a token and a return value) to ADDC (which returns
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/// a result and a carry value), to calls (which may return an arbitrary number
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/// of values).
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///
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/// As such, each use of a SelectionDAG computation must indicate the node that
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/// computes it as well as which return value to use from that node. This pair
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/// of information is represented with the SDOperand value type.
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///
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struct SDOperand {
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SDNode *Val; // The node defining the value we are using.
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unsigned ResNo; // Which return value of the node we are using.
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SDOperand() : Val(0) {}
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SDOperand(SDNode *val, unsigned resno) : Val(val), ResNo(resno) {}
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bool operator==(const SDOperand &O) const {
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return Val == O.Val && ResNo == O.ResNo;
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}
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bool operator!=(const SDOperand &O) const {
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return !operator==(O);
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}
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bool operator<(const SDOperand &O) const {
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return Val < O.Val || (Val == O.Val && ResNo < O.ResNo);
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}
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SDOperand getValue(unsigned R) const {
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return SDOperand(Val, R);
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}
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/// getValueType - Return the ValueType of the referenced return value.
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///
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inline MVT::ValueType getValueType() const;
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// Forwarding methods - These forward to the corresponding methods in SDNode.
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inline unsigned getOpcode() const;
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inline unsigned getNumOperands() const;
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inline const SDOperand &getOperand(unsigned i) const;
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};
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/// simplify_type specializations - Allow casting operators to work directly on
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/// SDOperands as if they were SDNode*'s.
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template<> struct simplify_type<SDOperand> {
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typedef SDNode* SimpleType;
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static SimpleType getSimplifiedValue(const SDOperand &Val) {
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return static_cast<SimpleType>(Val.Val);
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}
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};
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template<> struct simplify_type<const SDOperand> {
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typedef SDNode* SimpleType;
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static SimpleType getSimplifiedValue(const SDOperand &Val) {
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return static_cast<SimpleType>(Val.Val);
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}
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};
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/// SDNode - Represents one node in the SelectionDAG.
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///
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class SDNode {
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unsigned NodeType;
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std::vector<SDOperand> Operands;
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/// Values - The types of the values this node defines. SDNode's may define
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/// multiple values simultaneously.
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std::vector<MVT::ValueType> Values;
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/// Uses - These are all of the SDNode's that use a value produced by this
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/// node.
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std::vector<SDNode*> Uses;
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public:
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//===--------------------------------------------------------------------===//
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// Accessors
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//
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unsigned getOpcode() const { return NodeType; }
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size_t use_size() const { return Uses.size(); }
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bool use_empty() const { return Uses.empty(); }
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bool hasOneUse() const { return Uses.size() == 1; }
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/// getNumOperands - Return the number of values used by this operation.
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///
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unsigned getNumOperands() const { return Operands.size(); }
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const SDOperand &getOperand(unsigned Num) {
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assert(Num < Operands.size() && "Invalid child # of SDNode!");
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return Operands[Num];
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}
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const SDOperand &getOperand(unsigned Num) const {
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assert(Num < Operands.size() && "Invalid child # of SDNode!");
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return Operands[Num];
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}
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/// getNumValues - Return the number of values defined/returned by this
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/// operator.
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///
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unsigned getNumValues() const { return Values.size(); }
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/// getValueType - Return the type of a specified result.
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///
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MVT::ValueType getValueType(unsigned ResNo) const {
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assert(ResNo < Values.size() && "Illegal result number!");
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return Values[ResNo];
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}
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void dump() const;
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static bool classof(const SDNode *) { return true; }
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protected:
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friend class SelectionDAG;
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SDNode(unsigned NT, MVT::ValueType VT) : NodeType(NT) {
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Values.reserve(1);
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Values.push_back(VT);
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}
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SDNode(unsigned NT, SDOperand Op)
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: NodeType(NT) {
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Operands.reserve(1); Operands.push_back(Op);
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Op.Val->Uses.push_back(this);
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}
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SDNode(unsigned NT, SDOperand N1, SDOperand N2)
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: NodeType(NT) {
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Operands.reserve(2); Operands.push_back(N1); Operands.push_back(N2);
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N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
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}
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SDNode(unsigned NT, SDOperand N1, SDOperand N2, SDOperand N3)
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: NodeType(NT) {
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Operands.reserve(3); Operands.push_back(N1); Operands.push_back(N2);
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Operands.push_back(N3);
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N1.Val->Uses.push_back(this); N2.Val->Uses.push_back(this);
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N3.Val->Uses.push_back(this);
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}
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SDNode(unsigned NT, std::vector<SDOperand> &Nodes) : NodeType(NT) {
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Operands.swap(Nodes);
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for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
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Nodes[i].Val->Uses.push_back(this);
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}
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virtual ~SDNode() {
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// FIXME: Drop uses.
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}
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void setValueTypes(MVT::ValueType VT) {
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Values.reserve(1);
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Values.push_back(VT);
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}
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void setValueTypes(MVT::ValueType VT1, MVT::ValueType VT2) {
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Values.reserve(2);
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Values.push_back(VT1);
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Values.push_back(VT2);
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}
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/// Note: this method destroys the vector passed in.
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void setValueTypes(std::vector<MVT::ValueType> &VTs) {
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std::swap(Values, VTs);
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}
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};
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// Define inline functions from the SDOperand class.
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inline unsigned SDOperand::getOpcode() const {
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return Val->getOpcode();
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}
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inline MVT::ValueType SDOperand::getValueType() const {
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return Val->getValueType(ResNo);
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}
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inline unsigned SDOperand::getNumOperands() const {
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return Val->getNumOperands();
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}
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inline const SDOperand &SDOperand::getOperand(unsigned i) const {
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return Val->getOperand(i);
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}
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class ConstantSDNode : public SDNode {
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uint64_t Value;
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protected:
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friend class SelectionDAG;
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ConstantSDNode(uint64_t val, MVT::ValueType VT)
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: SDNode(ISD::Constant, VT), Value(val) {
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}
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public:
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uint64_t getValue() const { return Value; }
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int64_t getSignExtended() const {
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unsigned Bits = MVT::getSizeInBits(getValueType(0));
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return ((int64_t)Value << 64-Bits) >> 64-Bits;
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}
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bool isNullValue() const { return Value == 0; }
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bool isAllOnesValue() const {
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return Value == (1ULL << MVT::getSizeInBits(getValueType(0)))-1;
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}
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static bool classof(const ConstantSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::Constant;
|
||||
}
|
||||
};
|
||||
|
||||
class ConstantFPSDNode : public SDNode {
|
||||
double Value;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
ConstantFPSDNode(double val, MVT::ValueType VT)
|
||||
: SDNode(ISD::ConstantFP, VT), Value(val) {
|
||||
}
|
||||
public:
|
||||
|
||||
double getValue() const { return Value; }
|
||||
|
||||
/// isExactlyValue - We don't rely on operator== working on double values, as
|
||||
/// it returns true for things that are clearly not equal, like -0.0 and 0.0.
|
||||
/// As such, this method can be used to do an exact bit-for-bit comparison of
|
||||
/// two floating point values.
|
||||
bool isExactlyValue(double V) const {
|
||||
union {
|
||||
double V;
|
||||
uint64_t I;
|
||||
} T1;
|
||||
T1.V = Value;
|
||||
union {
|
||||
double V;
|
||||
uint64_t I;
|
||||
} T2;
|
||||
T2.V = V;
|
||||
return T1.I == T2.I;
|
||||
}
|
||||
|
||||
static bool classof(const ConstantFPSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::ConstantFP;
|
||||
}
|
||||
};
|
||||
|
||||
class GlobalAddressSDNode : public SDNode {
|
||||
GlobalValue *TheGlobal;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
GlobalAddressSDNode(const GlobalValue *GA, MVT::ValueType VT)
|
||||
: SDNode(ISD::GlobalAddress, VT) {
|
||||
TheGlobal = const_cast<GlobalValue*>(GA);
|
||||
|
||||
}
|
||||
public:
|
||||
|
||||
GlobalValue *getGlobal() const { return TheGlobal; }
|
||||
|
||||
static bool classof(const GlobalAddressSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::GlobalAddress;
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
class FrameIndexSDNode : public SDNode {
|
||||
int FI;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
FrameIndexSDNode(int fi, MVT::ValueType VT)
|
||||
: SDNode(ISD::FrameIndex, VT), FI(fi) {}
|
||||
public:
|
||||
|
||||
int getIndex() const { return FI; }
|
||||
|
||||
static bool classof(const FrameIndexSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::FrameIndex;
|
||||
}
|
||||
};
|
||||
|
||||
class ConstantPoolSDNode : public SDNode {
|
||||
unsigned CPI;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
ConstantPoolSDNode(unsigned cpi, MVT::ValueType VT)
|
||||
: SDNode(ISD::ConstantPool, VT), CPI(cpi) {}
|
||||
public:
|
||||
|
||||
unsigned getIndex() const { return CPI; }
|
||||
|
||||
static bool classof(const ConstantPoolSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::ConstantPool;
|
||||
}
|
||||
};
|
||||
|
||||
class BasicBlockSDNode : public SDNode {
|
||||
MachineBasicBlock *MBB;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
BasicBlockSDNode(MachineBasicBlock *mbb)
|
||||
: SDNode(ISD::BasicBlock, MVT::Other), MBB(mbb) {}
|
||||
public:
|
||||
|
||||
MachineBasicBlock *getBasicBlock() const { return MBB; }
|
||||
|
||||
static bool classof(const BasicBlockSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::BasicBlock;
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
class CopyRegSDNode : public SDNode {
|
||||
unsigned Reg;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
CopyRegSDNode(SDOperand Chain, SDOperand Src, unsigned reg)
|
||||
: SDNode(ISD::CopyToReg, Chain, Src), Reg(reg) {
|
||||
setValueTypes(MVT::Other); // Just a token chain.
|
||||
}
|
||||
CopyRegSDNode(unsigned reg, MVT::ValueType VT)
|
||||
: SDNode(ISD::CopyFromReg, VT), Reg(reg) {
|
||||
}
|
||||
public:
|
||||
|
||||
unsigned getReg() const { return Reg; }
|
||||
|
||||
static bool classof(const CopyRegSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::CopyToReg ||
|
||||
N->getOpcode() == ISD::CopyFromReg;
|
||||
}
|
||||
};
|
||||
|
||||
class ExternalSymbolSDNode : public SDNode {
|
||||
const char *Symbol;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
ExternalSymbolSDNode(const char *Sym, MVT::ValueType VT)
|
||||
: SDNode(ISD::ExternalSymbol, VT), Symbol(Sym) {
|
||||
}
|
||||
public:
|
||||
|
||||
const char *getSymbol() const { return Symbol; }
|
||||
|
||||
static bool classof(const ExternalSymbolSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::ExternalSymbol;
|
||||
}
|
||||
};
|
||||
|
||||
class SetCCSDNode : public SDNode {
|
||||
ISD::CondCode Condition;
|
||||
protected:
|
||||
friend class SelectionDAG;
|
||||
SetCCSDNode(ISD::CondCode Cond, SDOperand LHS, SDOperand RHS)
|
||||
: SDNode(ISD::SETCC, LHS, RHS), Condition(Cond) {
|
||||
setValueTypes(MVT::i1);
|
||||
}
|
||||
public:
|
||||
|
||||
ISD::CondCode getCondition() const { return Condition; }
|
||||
|
||||
static bool classof(const SetCCSDNode *) { return true; }
|
||||
static bool classof(const SDNode *N) {
|
||||
return N->getOpcode() == ISD::SETCC;
|
||||
}
|
||||
};
|
||||
|
||||
} // end llvm namespace
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue
Block a user