Heed guessInstructionProperties, and stop warning on redundant flags.

Emit TableGen errors if guessInstructionProperties is 0 and
instruction properties can't be inferred from patterns.

Allow explicit instruction properties even when they can be inferred.

This patch doesn't change the TableGen output. Redundant properties
are not yet verified because the tree has errors.

llvm-svn: 162516

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index 7637a5b5c8e..f601a8318f5 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -249,6 +249,14 @@ namespace llvm {
     bool isCodeGenOnly;
     bool isPseudo;
 
+    /// Are there any undefined flags?
+    bool hasUndefFlags() const {
+      return mayLoad_Unset || mayStore_Unset || hasSideEffects_Unset;
+    }
+
+    // The record used to infer instruction flags, or NULL if no flag values
+    // have been inferred.
+    Record *InferredFrom;
 
     CodeGenInstruction(Record *R);