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

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

llvm-svn: 26077
This commit is contained in:
Chris Lattner 2006-02-09 04:44:32 +00:00
parent ba97264e72
commit 8bb44151e1
1 changed files with 15 additions and 17 deletions
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30
llvm/include/llvm/CodeGen/MachineConstantPool.h
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@ -24,41 +24,38 @@
#include <vector>
#include <iosfwd>
#include <cassert>
namespace llvm {
class Constant;
class TargetData;
/// MachineConstantPoolEntry - One entry in the constant pool.
///
struct MachineConstantPoolEntry {
/// Val - The constant itself.
Constant *Val;
/// Alignment - The alignment of the constant.
unsigned Alignment;
/// Offset - The offset of the constant from the start of the constant pool.
unsigned Offset;
MachineConstantPoolEntry(Constant *V, unsigned A) : Val(V), Alignment(A) {}
MachineConstantPoolEntry(Constant *V, unsigned O) : Val(V), Offset(O) {}
};
class MachineConstantPool {
const TargetData &TD;
unsigned PoolAlignment;
std::vector<MachineConstantPoolEntry> Constants;
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
/// an existing one. User must specify an alignment in bytes for the object.
///
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;
}
unsigned getConstantPoolIndex(Constant *C, unsigned Alignment);
/// isEmpty - Return true if this constant pool contains no constants.
///
@ -74,6 +71,7 @@ public:
void print(std::ostream &OS) const;
/// dump - Call print(std::cerr) to be called from the debugger.
///
void dump() const;
};