From: Chris Lattner <sabre@nondot.org>
Date: Tue, 26 Oct 2004 05:29:18 +0000 (+0000)
Subject: Reduce usage of MRegisterInfo::getRegClass
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ad3c74fc9b52b652859807580c8e40b67394d689;p=oota-llvm.git

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 c3a15fcc198..713f2f892d5 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -658,15 +658,16 @@ void LiveIntervals::joinIntervals() {
 /// 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