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Add vector `implicitUses' to class MachineCodeForVMInstr to hold values

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that are used by the VM instruction but not explicit operands of the
m/c instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2001-10-01 00:18:12 +00:00
parent 4cecdd206e
commit 2a97dd1fc3
1 changed files with 19 additions and 12 deletions
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31
include/llvm/CodeGen/MachineInstr.h
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@ -363,29 +363,36 @@ public:
//
// Purpose:
// Representation of the sequence of machine instructions created
// for a single VM instruction. Additionally records any temporary
// "values" used as intermediate values in this sequence.
// Note that such values should be treated as pure SSA values with
// no interpretation of their operands (i.e., as a TmpInstruction object
// which actually represents such a value).
// for a single VM instruction. Additionally records information
// about hidden and implicit values used by the machine instructions:
//
// (1) "Temporary values" are intermediate values used in the machine
// instruction sequence, but not in the VM instruction
// Note that such values should be treated as pure SSA values with
// no interpretation of their operands (i.e., as a TmpInstruction
// object which actually represents such a value).
//
// (2) "Implicit uses" are values used in the VM instruction but not in
// the machine instruction sequence
//
//---------------------------------------------------------------------------
class MachineCodeForVMInstr: public vector<MachineInstr*>
{
private:
vector<Value*> tempVec;
vector< Value*> tempVec; // used by m/c instr but not VM instr
vector<const Value*> implicitUses; // used by VM instr but not m/c instr
public:
/*ctor*/ MachineCodeForVMInstr () {}
/*ctor*/ ~MachineCodeForVMInstr ();
const vector<Value*>&
getTempValues () const { return tempVec; }
const vector< Value*>& getTempValues () const { return tempVec; }
const vector<const Value*>& getImplicitUses() const { return implicitUses; }
void addTempValue ( Value* val) { tempVec.push_back(val); }
void addImplicitUse(const Value* val) { implicitUses.push_back(val);}
void addTempValue (Value* val)
{ tempVec.push_back(val); }
// dropAllReferences() - This function drops all references within
// temporary (hidden) instructions created in implementing the original
// VM intruction. This ensures there are no remaining "uses" within
@ -396,7 +403,7 @@ public:
inline void dropAllReferences() {
for (unsigned i=0, N=tempVec.size(); i < N; i++)
if (Instruction *I = tempVec[i]->castInstruction())
I->dropAllReferences();
I->dropAllReferences();
}
};