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pull inverse reg class mapping into a class that is sharable and out of the

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target register description classes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5045 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-12-15 18:38:59 +00:00
parent abe8dd592d
commit dd444f9242
1 changed files with 28 additions and 6 deletions
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34
lib/CodeGen/RegAllocSimple.cpp
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@ -11,6 +11,30 @@
#include "Support/Statistic.h"
#include <iostream>
/// PhysRegClassMap - Construct a mapping of physical register numbers to their
/// register classes.
///
/// NOTE: This class will eventually be pulled out to somewhere shared.
///
class PhysRegClassMap {
std::map<unsigned, const TargetRegisterClass*> PhysReg2RegClassMap;
public:
PhysRegClassMap(const MRegisterInfo *RI) {
for (MRegisterInfo::const_iterator I = RI->regclass_begin(),
E = RI->regclass_end(); I != E; ++I)
for (unsigned i=0; i < (*I)->getNumRegs(); ++i)
PhysReg2RegClassMap[(*I)->getRegister(i)] = *I;
}
const TargetRegisterClass *operator[](unsigned Reg) {
assert(PhysReg2RegClassMap[Reg] && "Register is not a known physreg!");
return PhysReg2RegClassMap[Reg];
}
const TargetRegisterClass *get(unsigned Reg) { return operator[](Reg); }
};
namespace {
struct RegAllocSimple : public FunctionPass {
TargetMachine &TM;
@ -27,7 +51,7 @@ namespace {
std::map<unsigned, unsigned> SSA2PhysRegMap;
// Maps physical register to their register classes
std::map<unsigned, const TargetRegisterClass*> PhysReg2RegClassMap;
PhysRegClassMap PhysRegClasses;
// Made to combat the incorrect allocation of r2 = add r1, r1
std::map<unsigned, unsigned> VirtReg2PhysRegMap;
@ -40,11 +64,9 @@ namespace {
RegAllocSimple(TargetMachine &tm) : TM(tm), CurrMBB(0), maxOffset(0),
RegInfo(tm.getRegisterInfo()),
ByteAlignment(4)
ByteAlignment(4),
PhysRegClasses(RegInfo)
{
// build reverse mapping for physReg -> register class
RegInfo->buildReg2RegClassMap(PhysReg2RegClassMap);
RegsUsed[RegInfo->getFramePointer()] = 1;
RegsUsed[RegInfo->getStackPointer()] = 1;
@ -248,7 +270,7 @@ bool RegAllocSimple::runOnMachineFunction(MachineFunction &Fn) {
// Find the register class of the target register: should be the
// same as the values we're trying to store there
const TargetRegisterClass* regClass = PhysReg2RegClassMap[physReg];
const TargetRegisterClass* regClass = PhysRegClasses[physReg];
assert(regClass && "Target register class not found!");
unsigned dataSize = regClass->getDataSize();