fix specializations in int.__floordiv__

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/ints/IntBuiltins.java

@@ -415,10 +415,42 @@ long doLL(long left, long right) {
             return Math.floorDiv(left, right);
         }
 
+        @Specialization(rewriteOn = ArithmeticException.class)
+        int doLPi(int left, PInt right) throws ArithmeticException {
+            raiseDivisionByZero(right.isZero());
+            return Math.floorDiv(left, right.intValueExact());
+        }
+
         @Specialization
-        PInt doLPi(long left, PInt right) {
+        int doLPiOvf(int left, PInt right) {
             raiseDivisionByZero(right.isZero());
-            return factory().createInt(op(BigInteger.valueOf(left), right.getValue()));
+            try {
+                return Math.floorDiv(left, right.intValueExact());
+            } catch (ArithmeticException e) {
+                return 0;
+            }
+        }
+
+        @Specialization(rewriteOn = ArithmeticException.class)
+        long doLPi(long left, PInt right) throws ArithmeticException {
+            raiseDivisionByZero(right.isZero());
+            return Math.floorDiv(left, right.longValueExact());
+        }
+
+        @Specialization
+        long doLPiOvf(long left, PInt right) {
+            raiseDivisionByZero(right.isZero());
+            try {
+                return Math.floorDiv(left, right.longValueExact());
+            } catch (ArithmeticException e) {
+                return 0;
+            }
+        }
+
+        @Specialization
+        PInt doPiL(PInt left, int right) {
+            raiseDivisionByZero(right == 0);
+            return factory().createInt(op(left.getValue(), BigInteger.valueOf(right)));
         }
 
         @Specialization