[llvm-commits] [llvm] r57625 - in /llvm/trunk: lib/VMCore/ConstantFold.cpp test/Transforms/ConstProp/bitcast2.ll

[Chris Lattner]

Author: lattner
Date: Thu Oct 16 00:26:51 2008
New Revision: 57625

URL: http://llvm.org/viewvc/llvm-project?rev=57625&view=rev
Log:
apply Eli's patch for PR2165 and provide a testcase.

Added:
    llvm/trunk/test/Transforms/ConstProp/bitcast2.ll
Modified:
    llvm/trunk/lib/VMCore/ConstantFold.cpp

Modified: llvm/trunk/lib/VMCore/ConstantFold.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/ConstantFold.cpp?rev=57625&r1=57624&r2=57625&view=diff

==============================================================================
--- llvm/trunk/lib/VMCore/ConstantFold.cpp (original)
+++ llvm/trunk/lib/VMCore/ConstantFold.cpp Thu Oct 16 00:26:51 2008
@@ -133,6 +133,12 @@
       if (ConstantVector *CV = dyn_cast<ConstantVector>(V))
         return BitCastConstantVector(CV, DestPTy);
     }
+
+    // Canonicalize scalar-to-vector bitcasts into vector-to-vector bitcasts
+    // This allows for other simplifications (although some of them
+    // can only be handled by Analysis/ConstantFolding.cpp).
+    if (isa<ConstantInt>(V) || isa<ConstantFP>(V))
+      return ConstantExpr::getBitCast(ConstantVector::get(&V, 1), DestPTy);
   }
   
   // Finally, implement bitcast folding now.   The code below doesn't handle

Added: llvm/trunk/test/Transforms/ConstProp/bitcast2.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/ConstProp/bitcast2.ll?rev=57625&view=auto

==============================================================================
--- llvm/trunk/test/Transforms/ConstProp/bitcast2.ll (added)
+++ llvm/trunk/test/Transforms/ConstProp/bitcast2.ll Thu Oct 16 00:26:51 2008
@@ -0,0 +1,8 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep bitcast
+; PR2165
+
+define <1 x i64> @test() {
+  %A = bitcast i64 63 to <1 x i64>
+  ret <1 x i64> %A
+}
+