Instructions with ImmutablePredicateOperand aren't really predicable since their predicates are fixed at isel time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37899 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index c54ecd02e4..e4d80ee669 100644
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -411,7 +411,10 @@ CodeGenInstruction::CodeGenInstruction(Record *R, const std::string &AsmStr)
       if (unsigned NumArgs = MIOpInfo->getNumArgs())
         NumOps = NumArgs;
 
-      isPredicable |= Rec->isSubClassOf("PredicateOperand");
+      if (Rec->isSubClassOf("PredicateOperand")) {
+        if (!Rec->getValueAsBit("isImmutable"))
+          isPredicable = true;
+      }
     } else if (Rec->getName() == "variable_ops") {
       hasVariableNumberOfOperands = true;
       continue;