diff options
Diffstat (limited to 'lib/Target')
-rw-r--r-- | lib/Target/TargetRegisterInfo.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/lib/Target/TargetRegisterInfo.cpp b/lib/Target/TargetRegisterInfo.cpp index dcc5f61..32299f6 100644 --- a/lib/Target/TargetRegisterInfo.cpp +++ b/lib/Target/TargetRegisterInfo.cpp @@ -60,6 +60,25 @@ TargetRegisterInfo::getPhysicalRegisterRegClass(unsigned reg, EVT VT) const { return BestRC; } +/// getMinimalPhysRegClass - Returns the Register Class of a physical +/// register of the given type. +const TargetRegisterClass * +TargetRegisterInfo::getMinimalPhysRegClass(unsigned reg) const { + assert(isPhysicalRegister(reg) && "reg must be a physical register"); + + // Pick the most sub 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 (RC->contains(reg) && (!BestRC || BestRC->hasSubClass(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. static void getAllocatableSetForRC(const MachineFunction &MF, |