Virtual registers with a known preferred register are prioritized by
RAGreedy. This function makes the condition explicit without depending
on getRegAllocPref().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169179
91177308-0d34-0410-b5e6-
96231b3b80d8
return getPhys(VirtReg) == getRegAllocPref(VirtReg);
}
+ /// @brief returns true if VirtReg has a known preferred register.
+ /// This returns false if VirtReg has a preference that is a virtual
+ /// register that hasn't been assigned yet.
+ bool hasKnownPreference(unsigned VirtReg);
+
/// @brief records virtReg is a split live interval from SReg.
void setIsSplitFromReg(unsigned virtReg, unsigned SReg) {
Virt2SplitMap[virtReg] = SReg;
Prio = (1u << 31) + Size;
// Boost ranges that have a physical register hint.
- if (TargetRegisterInfo::isPhysicalRegister(VRM->getRegAllocPref(Reg)))
+ if (VRM->hasKnownPreference(Reg))
Prio |= (1u << 30);
}
return TRI->ResolveRegAllocHint(Hint.first, physReg, *MF);
}
+bool VirtRegMap::hasKnownPreference(unsigned VirtReg) {
+ std::pair<unsigned, unsigned> Hint = MRI->getRegAllocationHint(VirtReg);
+ if (TargetRegisterInfo::isPhysicalRegister(Hint.second))
+ return true;
+ if (TargetRegisterInfo::isVirtualRegister(Hint.second))
+ return hasPhys(Hint.second);
+ return false;
+}
+
int VirtRegMap::assignVirt2StackSlot(unsigned virtReg) {
assert(TargetRegisterInfo::isVirtualRegister(virtReg));
assert(Virt2StackSlotMap[virtReg] == NO_STACK_SLOT &&