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https://github.com/c64scene-ar/llvm-6502.git
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b8354a8e4f
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@832 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
#include "llvm/Analysis/LiveVar/LiveVarSet.h"
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#include "llvm/CodeGen/MachineInstr.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 *const MInst)
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{
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for( MachineInstr::val_op_const_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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remove(*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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remove( MInst->getImplicitRef(i) );
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}
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for( MachineInstr::val_op_const_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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add( *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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add( MInst->getImplicitRef(i) );
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}
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}
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#if 0
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void LiveVarSet::applyTranferFuncForInst(const Instruction *const Inst)
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{
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if( Inst->isDefinition() ) { // add to Defs iff this instr is a definition
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remove(Inst); // this definition kills any uses
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}
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Instruction::op_const_iterator OpI = Inst->op_begin(); // get operand iterat
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for( ; OpI != Inst->op_end() ; OpI++) { // iterate over operands
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if ( ((*OpI)->getType())->isLabelType()) continue; // don't process labels
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add( *OpI ); // An operand is a use - so add to use set
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}
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}
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#endif
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