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instead of keeping track of Constant/alignment pairs, actually compute the

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offset of each entry from the start of the constant pool.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26077 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-02-09 04:44:32 +00:00
parent fa77d43ba1
commit 04a0f60b23
1 changed files with 15 additions and 17 deletions
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30
include/llvm/CodeGen/MachineConstantPool.h
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@ -24,41 +24,38 @@
#include <vector> #include <vector>
#include <iosfwd> #include <iosfwd>
#include <cassert>
namespace llvm { namespace llvm {
class Constant; class Constant;
class TargetData;
/// MachineConstantPoolEntry - One entry in the constant pool. /// MachineConstantPoolEntry - One entry in the constant pool.
/// ///
struct MachineConstantPoolEntry { struct MachineConstantPoolEntry {
/// Val - The constant itself. /// Val - The constant itself.
Constant *Val; Constant *Val;
/// Alignment - The alignment of the constant. /// Offset - The offset of the constant from the start of the constant pool.
unsigned Alignment; unsigned Offset;
MachineConstantPoolEntry(Constant *V, unsigned A) : Val(V), Alignment(A) {} MachineConstantPoolEntry(Constant *V, unsigned O) : Val(V), Offset(O) {}
}; };
class MachineConstantPool { class MachineConstantPool {
const TargetData &TD;
unsigned PoolAlignment;
std::vector<MachineConstantPoolEntry> Constants; std::vector<MachineConstantPoolEntry> Constants;
public: public:
MachineConstantPool(const TargetData &td) : TD(td), PoolAlignment(1) {}
/// getConstantPoolAlignment - Return the log2 of the alignment required by
/// the whole constant pool, of which the first element must be aligned.
unsigned getConstantPoolAlignment() const { return PoolAlignment; }
/// getConstantPoolIndex - Create a new entry in the constant pool or return /// getConstantPoolIndex - Create a new entry in the constant pool or return
/// an existing one. User must specify an alignment in bytes for the object. /// an existing one. User must specify an alignment in bytes for the object.
/// ///
unsigned getConstantPoolIndex(Constant *C, unsigned Alignment) { unsigned getConstantPoolIndex(Constant *C, unsigned Alignment);
assert(Alignment && "Alignment must be specified!");
// Check to see if we already have this constant.
//
// FIXME, this could be made much more efficient for large constant pools.
for (unsigned i = 0, e = Constants.size(); i != e; ++i)
if (Constants[i].Val == C && Constants[i].Alignment >= Alignment)
return i;
Constants.push_back(MachineConstantPoolEntry(C, Alignment));
return Constants.size()-1;
}
/// isEmpty - Return true if this constant pool contains no constants. /// isEmpty - Return true if this constant pool contains no constants.
/// ///
@ -74,6 +71,7 @@ public:
void print(std::ostream &OS) const; void print(std::ostream &OS) const;
/// dump - Call print(std::cerr) to be called from the debugger. /// dump - Call print(std::cerr) to be called from the debugger.
///
void dump() const; void dump() const;
}; };