commit f031d0977f8b03288ed32ff14f71c79e81914f39
author Cameron Zwarich <zwarich@apple.com> Fri May 27 05:04:51 2011 +0000
committer Cameron Zwarich <zwarich@apple.com> Fri May 27 05:04:51 2011 +0000
tree dc6f0709486977f478b45d40f809459f390efc9b
parent 3a5d7d0665e2c836fb7619ea1160b29c36827c4a

Fix PR10029 - VerifyCoalescing failure on patterns_dfa.c of 445.gobmk.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132181 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/UnreachableBlockElim.cpp

diff --git a/lib/CodeGen/UnreachableBlockElim.cpp b/lib/CodeGen/UnreachableBlockElim.cpp
index 48d8ab1..52693f0 100644
--- a/lib/CodeGen/UnreachableBlockElim.cpp
+++ b/lib/CodeGen/UnreachableBlockElim.cpp
@@ -196,8 +196,11 @@
         temp->eraseFromParent();
         ModifiedPHI = true;
 
-        if (Input != Output)
-          F.getRegInfo().replaceRegWith(Output, Input);
+        if (Input != Output) {
+          MachineRegisterInfo &MRI = F.getRegInfo();
+          MRI.constrainRegClass(Input, MRI.getRegClass(Output));
+          MRI.replaceRegWith(Output, Input);
+        }
 
         continue;
       }