Reduce usage of MRegisterInfo::getRegClass
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17238 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index c3a15fc..713f2f8 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -658,15 +658,16 @@
/// classes. The registers may be either phys or virt regs.
bool LiveIntervals::differingRegisterClasses(unsigned RegA,
unsigned RegB) const {
- const TargetRegisterClass *RegClass;
// Get the register classes for the first reg.
- if (MRegisterInfo::isVirtualRegister(RegA))
- RegClass = mf_->getSSARegMap()->getRegClass(RegA);
- else
- RegClass = mri_->getRegClass(RegA);
+ if (MRegisterInfo::isPhysicalRegister(RegA)) {
+ assert(MRegisterInfo::isVirtualRegister(RegB) &&
+ "Shouldn't consider two physregs!");
+ return !mf_->getSSARegMap()->getRegClass(RegB)->contains(RegA);
+ }
// Compare against the regclass for the second reg.
+ const TargetRegisterClass *RegClass = mf_->getSSARegMap()->getRegClass(RegA);
if (MRegisterInfo::isVirtualRegister(RegB))
return RegClass != mf_->getSSARegMap()->getRegClass(RegB);
else