Change APFloat::convertFromInteger to take the incoming

bit width instead of number of words allocated, which
makes it actually work for int->APF conversions.
Adjust callers.  Add const to one of the APInt constructors
to prevent surprising match when called with const
argument.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42210 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -1595,8 +1595,10 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
     case ISD::SINT_TO_FP: {
       const uint64_t zero[] = {0, 0};
       APFloat apf = APFloat(APInt(MVT::getSizeInBits(VT), 2, zero));
-      (void)apf.convertFromInteger(&Val, 1, Opcode==ISD::SINT_TO_FP,
-                                  APFloat::rmTowardZero);
+      (void)apf.convertFromInteger(&Val, 
+                               MVT::getSizeInBits(Operand.getValueType()), 
+                               Opcode==ISD::SINT_TO_FP,
+                               APFloat::rmTowardZero);
       return getConstantFP(apf, VT);
     }
     case ISD::BIT_CONVERT: