[CODEGEN/DRIVER] Tweaks for performance optimization (#193)

include/triton/ir/dispatch.h

@@ -98,6 +98,7 @@ struct dispatch{
 
   // internal (debug/optimization)
   static ir::value *multiple_of(ir::value *x, int value, ir::builder *builder);
+  static ir::value *max_contiguous(ir::value *x, int value, ir::builder *builder);
   static ir::value *debug_barrier(ir::builder *builder);
 };
 

include/triton/ir/metadata.h

@@ -11,7 +11,8 @@ namespace ir{
 class metadata{
 public:
   enum kind_t{
-    multiple_of
+    multiple_of,
+    max_contiguous
   };
 
 private:

include/triton/tools/sys/exec.hpp

@@ -0,0 +1,37 @@
+#ifndef TRITON_TOOLS_SYS_EXEC_HPP
+#define TRITON_TOOLS_SYS_EXEC_HPP
+
+#include <cstdio>
+#include <iostream>
+#include <memory>
+#include <stdexcept>
+#include <string>
+
+namespace triton
+{
+namespace tools
+{
+
+
+
+int exec(const std::string& cmd, std::string& result) {
+  char buffer[128];
+  FILE* pipe = popen(cmd.c_str(), "r");
+  if (!pipe)
+    return 0;
+  result.clear();
+  try {
+    while (fgets(buffer, sizeof buffer, pipe) != NULL)
+      result += buffer;
+  } catch (...) {
+    pclose(pipe);
+    return 0;
+  }
+  return WEXITSTATUS(pclose(pipe));
+
+}
+
+}
+}
+
+#endif