From: Eric Christopher <echristo@apple.com>
Date: Wed, 25 Aug 2010 04:58:56 +0000 (+0000)
Subject: Allow strict subclasses of register classes, this way we can handle
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=53452606ca04929257b3bcbfa5e0d59a44925882;p=oota-llvm.git

Allow strict subclasses of register classes, this way we can handle
ARM instructions with:

foo GPR, rGPR

which happens a lot.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112025 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/utils/TableGen/FastISelEmitter.cpp b/utils/TableGen/FastISelEmitter.cpp
index 243208612d5..6c16fcfaa8a 100644
--- a/utils/TableGen/FastISelEmitter.cpp
+++ b/utils/TableGen/FastISelEmitter.cpp
@@ -112,9 +112,10 @@ struct OperandsSignature {
       if (!RC)
         return false;
 
-      // For now, all the operands must have the same register class.
+      // For now, all the operands must have the same register class or be
+      // a strict subclass of the destination.
       if (DstRC) {
-        if (DstRC != RC)
+        if (DstRC != RC && !DstRC->hasSubClass(RC))
           return false;
       } else
         DstRC = RC;