[llvm-commits] [llvm] r164256 - /llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp

[Owen Anderson]

Author: resistor
Date: Wed Sep 19 17:15:06 2012
New Revision: 164256

URL: http://llvm.org/viewvc/llvm-project?rev=164256&view=rev
Log:
Soften the pattern-can-never-match error in TableGen into a warning. This pattern can be very useful in cases where you want to define a multiclass that covers both commutative and non-commutative operators (say, add and sub).

Modified:
    llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp

Modified: llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp?rev=164256&r1=164255&r2=164256&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp (original)
+++ llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp Wed Sep 19 17:15:06 2012
@@ -2800,8 +2800,11 @@
                                            const PatternToMatch &PTM) {
   // Do some sanity checking on the pattern we're about to match.
   std::string Reason;
-  if (!PTM.getSrcPattern()->canPatternMatch(Reason, *this))
-    Pattern->error("Pattern can never match: " + Reason);
+  if (!PTM.getSrcPattern()->canPatternMatch(Reason, *this)) {
+    PrintWarning(Pattern->getRecord()->getLoc(),
+      Twine("Pattern can never match: ") + Reason);
+    return;
+  }
 
   // If the source pattern's root is a complex pattern, that complex pattern
   // must specify the nodes it can potentially match.