TargetRegisterInfo::TargetRegisterInfo(const TargetRegisterDesc *D, unsigned NR,
regclass_iterator RCB, regclass_iterator RCE,
- int CFSO, int CFDO)
- : Desc(D), NumRegs(NR), RegClassBegin(RCB), RegClassEnd(RCE) {
+ int CFSO, int CFDO,
+ const unsigned* subregs, const unsigned subregsize,
+ const unsigned* superregs, const unsigned superregsize,
+ const unsigned* aliases, const unsigned aliasessize)
+ : SubregHash(subregs), SubregHashSize(subregsize),
+ SuperregHash(superregs), SuperregHashSize(superregsize),
+ AliasesHash(aliases), AliasesHashSize(aliasessize),
+ Desc(D), NumRegs(NR), RegClassBegin(RCB), RegClassEnd(RCE) {
assert(NumRegs < FirstVirtualRegister &&
"Target has too many physical registers!");
TargetRegisterInfo::~TargetRegisterInfo() {}
/// getPhysicalRegisterRegClass - Returns the Register Class of a physical
-/// register.
+/// register of the given type. If type is MVT::Other, then just return any
+/// register class the register belongs to.
const TargetRegisterClass *
-TargetRegisterInfo::getPhysicalRegisterRegClass(MVT::ValueType VT,
- unsigned reg) const {
+TargetRegisterInfo::getPhysicalRegisterRegClass(unsigned reg, MVT VT) const {
assert(isPhysicalRegister(reg) && "reg must be a physical register");
- // Pick the register class of the right type that contains this physreg.
- for (regclass_iterator I = regclass_begin(), E = regclass_end(); I != E; ++I)
- if ((*I)->hasType(VT) && (*I)->contains(reg))
- return *I;
- assert(false && "Couldn't find the register class");
- return 0;
-}
+ // Pick the most super register class of the right type that contains
+ // this physreg.
+ const TargetRegisterClass* BestRC = 0;
+ for (regclass_iterator I = regclass_begin(), E = regclass_end(); I != E; ++I){
+ const TargetRegisterClass* RC = *I;
+ if ((VT == MVT::Other || RC->hasType(VT)) && RC->contains(reg) &&
+ (!BestRC || BestRC->hasSuperClass(RC)))
+ BestRC = RC;
+ }
+
+ assert(BestRC && "Couldn't find the register class");
+ return BestRC;
+}
/// getAllocatableSetForRC - Toggle the bits that represent allocatable
/// registers for the specific register class.
// Default is to do nothing.
}
+const TargetRegisterClass *
+llvm::getCommonSubClass(const TargetRegisterClass *A,
+ const TargetRegisterClass *B) {
+ // First take care of the trivial cases
+ if (A == B)
+ return A;
+ if (!A || !B)
+ return 0;
+
+ // If B is a subclass of A, it will be handled in the loop below
+ if (B->hasSubClass(A))
+ return A;
+
+ const TargetRegisterClass *Best = 0;
+ for (TargetRegisterClass::sc_iterator I = A->subclasses_begin();
+ const TargetRegisterClass *X = *I; ++I) {
+ if (X == B)
+ return B; // B is a subclass of A
+
+ // X must be a common subclass of A and B
+ if (!B->hasSubClass(X))
+ continue;
+
+ // A superclass is definitely better.
+ if (!Best || Best->hasSuperClass(X)) {
+ Best = X;
+ continue;
+ }
+
+ // A subclass is definitely worse
+ if (Best->hasSubClass(X))
+ continue;
+
+ // Best and *I have no super/sub class relation - pick the larger class, or
+ // the smaller spill size.
+ int nb = std::distance(Best->begin(), Best->end());
+ int ni = std::distance(X->begin(), X->end());
+ if (ni>nb || (ni==nb && X->getSize() < Best->getSize()))
+ Best = X;
+ }
+ return Best;
+}