Don't do illegal cross-class coalescing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98044 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp
index ada95cd6da5784d41852ce3e4c2e22876d4d4b1f..68407c88d8ee3ae62875c6f376b7fd235ba64dd8 100644 (file)
--- a/lib/CodeGen/MachineCSE.cpp
+++ b/lib/CodeGen/MachineCSE.cpp
@@ -95,7 +95,7 @@ bool MachineCSE::PerformTrivialCoalescing(MachineInstr *MI,
         !SrcSubIdx && !DstSubIdx) {
       const TargetRegisterClass *SRC = MRI->getRegClass(SrcReg);
       const TargetRegisterClass *RC  = MRI->getRegClass(Reg);
-      if (SRC == RC || SRC->hasSubClass(RC) || RC->hasSubClass(SRC)) {
+      if (SRC == RC || RC->hasSubClass(SRC)) {
         DEBUG(dbgs() << "Coalescing: " << *DefMI);
         DEBUG(dbgs() << "*** to: " << *MI);
         MO.setReg(SrcReg);