raise the max instruction count for the VM to one billion

Author: Araq

changelog.md

@@ -27,6 +27,10 @@
 
 ### Compiler changes
 
+- The VM's instruction count limit was raised to 1 billion instructions in order
+  to support more complex computations at compile-time.
+
+
 ### Bugfixes
 
 - The `importcpp` pragma now allows importing the listed fields of generic

compiler/msgs.nim

@@ -357,7 +357,9 @@ const
     errXExpectsTwoArguments: "\'$1\' expects two arguments",
     errXExpectsObjectTypes: "\'$1\' expects object types",
     errXcanNeverBeOfThisSubtype: "\'$1\' can never be of this subtype",
-    errTooManyIterations: "interpretation requires too many iterations",
+    errTooManyIterations: "interpretation requires too many iterations; " &
+      "if you are sure this is not a bug in your code edit " &
+      "compiler/vmdef.MaxLoopIterations and rebuild the compiler",
     errCannotInterpretNodeX: "cannot evaluate \'$1\'",
     errFieldXNotFound: "field \'$1\' cannot be found",
     errInvalidConversionFromTypeX: "invalid conversion from type \'$1\'",

compiler/vmdef.nim

@@ -16,7 +16,7 @@ const
   byteExcess* = 128 # we use excess-K for immediates
   wordExcess* = 32768
 
-  MaxLoopIterations* = 1500_000 # max iterations of all loops
+  MaxLoopIterations* = 1_000_000_000 # max iterations of all loops
 
 
 type