LSR, correct fix for rdar://9786536. Silly casting bug.

llvm-svn: 135654

llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp

@@ -1480,8 +1480,8 @@ void LSRInstance::OptimizeShadowIV() {
     ConstantInt *Init = dyn_cast<ConstantInt>(PH->getIncomingValue(Entry));
     if (!Init) continue;
     Constant *NewInit = ConstantFP::get(DestTy, IsSigned ?
-                                        Init->getSExtValue() :
-                                        Init->getZExtValue());
+                                        (double)Init->getSExtValue() :
+                                        (double)Init->getZExtValue());
 
     BinaryOperator *Incr =
       dyn_cast<BinaryOperator>(PH->getIncomingValue(Latch));

llvm/test/Transforms/LoopStrengthReduce/2011-07-20-DoubleIV.ll

@@ -25,7 +25,7 @@ for.end:
 
 ; Now check that the computed double constant is correct.
 ; CHECK: @doubleIV
-; CHECK: phi double [ 0x43F0000000000000, %entry ]
+; CHECK: phi double [ -3.900000e+01, %entry ]
 ; CHECK: br
 define void @doubleIV() nounwind {
 entry: