stength reduce my previous patch a bit. The only instructions

that are allowed to have metadata operands are intrinsic calls,
and the only ones that take metadata currently return void.
Just reject all void instructions, which should not be value
numbered anyway.  To future proof things, add an assert to the
getHashValue impl for calls to check that metadata operands 
aren't present.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122759 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 6 deletions

diff --git a/lib/Transforms/Scalar/EarlyCSE.cpp b/lib/Transforms/Scalar/EarlyCSE.cpp
index 61830e02d6..6c2ea39896 100644
--- a/lib/Transforms/Scalar/EarlyCSE.cpp
+++ b/lib/Transforms/Scalar/EarlyCSE.cpp
@@ -145,14 +145,13 @@ namespace {
     }
     
     static bool canHandle(Instruction *Inst) {
+      // Don't value number anything that returns void.
+      if (Inst->getType()->isVoidTy())
+        return false;
+      
       CallInst *CI = dyn_cast<CallInst>(Inst);
       if (CI == 0 || !CI->onlyReadsMemory())
         return false;
-      
-      // Check that there are no metadata operands.
-      for (unsigned i = 0, e = CI->getNumOperands(); i != e; ++i)
-        if (CI->getOperand(i)->getType()->isMetadataTy())
-          return false;
       return true;
     }
   };
@@ -179,8 +178,12 @@ unsigned DenseMapInfo<CallValue>::getHashValue(CallValue Val) {
   Instruction *Inst = Val.Inst;
   // Hash in all of the operands as pointers.
   unsigned Res = 0;
-  for (unsigned i = 0, e = Inst->getNumOperands(); i != e; ++i)
+  for (unsigned i = 0, e = Inst->getNumOperands(); i != e; ++i) {
+    assert(!Inst->getOperand(i)->getType()->isMetadataTy() &&
+           "Cannot value number calls with metadata operands");
     Res ^= getHash(Inst->getOperand(i)) << i;
+  }
+  
   // Mix in the opcode.
   return (Res << 1) ^ Inst->getOpcode();
 }