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1164632c7e
* Convert over to valueset interface that uses insert & erase insead of add and remove * the -> operator really isn't that hard to use! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1687 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
1.4 KiB
C++
38 lines
1.4 KiB
C++
#include "llvm/Analysis/LiveVar/LiveVarSet.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Type.h"
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// This function applies a machine instr to a live var set (accepts OutSet) and
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// makes necessary changes to it (produces InSet). Note that two for loops are
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// used to first kill all defs and then to add all uses. This is because there
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// can be instructions like Val = Val + 1 since we allow multipe defs to a
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// machine instruction operand.
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void LiveVarSet::applyTranferFuncForMInst(const MachineInstr *MInst) {
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for (MachineInstr::val_const_op_iterator OpI(MInst); !OpI.done(); ++OpI) {
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if (OpI.isDef()) // kill only if this operand is a def
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insert(*OpI); // this definition kills any uses
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}
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// do for implicit operands as well
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for ( unsigned i=0; i < MInst->getNumImplicitRefs(); ++i) {
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if (MInst->implicitRefIsDefined(i))
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erase(MInst->getImplicitRef(i));
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}
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for (MachineInstr::val_const_op_iterator OpI(MInst); !OpI.done(); ++OpI) {
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if ((*OpI)->getType()->isLabelType()) continue; // don't process labels
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if (!OpI.isDef()) // add only if this operand is a use
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insert(*OpI); // An operand is a use - so add to use set
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}
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// do for implicit operands as well
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for (unsigned i=0; i < MInst->getNumImplicitRefs(); ++i) {
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if (!MInst->implicitRefIsDefined(i))
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insert(MInst->getImplicitRef(i));
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}
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}
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