Supporting dumping, switching off and debug printing of optimization phases

ispc.h

@@ -59,6 +59,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <vector>
+#include <set>
 #include <string>
 
 /** @def ISPC_MAX_NVEC maximum vector size of any of the compliation
@@ -66,6 +67,9 @@
  */
 #define ISPC_MAX_NVEC 64
 
+// Number of final optimization phase
+#define LAST_OPT_NUMBER 1000
+
 // Forward declarations of a number of widely-used LLVM types
 namespace llvm {
     class AttributeSet;
@@ -494,6 +498,16 @@ struct Globals {
         ispc's execution. */
     bool debugPrint;
 
+    /** Indicates which stages of optimization we want to dump. */
+    std::set<int> debug_stages;
+
+    /** Indicates after which optimization we want to generate
+        DebugIR information. */
+    int debugIR;
+
+    /** Indicates which phases of optimization we want to switch off. */
+    std::set<int> off_stages;
+
     /** Indicates whether all warning messages should be surpressed. */
     bool disableWarnings;