[llvm-commits] CVS: llvm/lib/CodeGen/RegAllocSimple.cpp
Chris Lattner
lattner at cs.uiuc.edu
Sun Dec 15 12:40:01 PST 2002
Changes in directory llvm/lib/CodeGen:
RegAllocSimple.cpp updated: 1.15 -> 1.16
---
Log message:
pull inverse reg class mapping into a class that is sharable and out of the
target register description classes.
---
Diffs of the changes:
Index: llvm/lib/CodeGen/RegAllocSimple.cpp
diff -u llvm/lib/CodeGen/RegAllocSimple.cpp:1.15 llvm/lib/CodeGen/RegAllocSimple.cpp:1.16
--- llvm/lib/CodeGen/RegAllocSimple.cpp:1.15 Sun Dec 15 12:19:24 2002
+++ llvm/lib/CodeGen/RegAllocSimple.cpp Sun Dec 15 12:38:59 2002
@@ -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 @@
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 @@
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 @@
// 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();
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