Feature/hash for source identity (#786)

* * Added COMMAND_LINE_SIMPLE test type
* Made how spawning works controllable by paramter/type SpawnType
* Made break-outside-loop and global-uniform run command line slangc

* calcRelativePath -> calcCombinedPath

* Add 64 bit version of GetHash.

* Add support for Hash based mode for CacheFileSystem.

1 files changed, 13 insertions, 2 deletions

diff --git a/source/core/hash.h b/source/core/hash.h
index ca6172fc7..fc0bca737 100644
--- a/source/core/hash.h
+++ b/source/core/hash.h
@@ -43,7 +43,18 @@ namespace Slang
         }
         return hash;
     }
-    
+
+    inline uint64_t GetHashCode64(const char * buffer, size_t numChars)
+    {
+        // Use uints because hash requires wrap around behavior and int is undefined on over/underflows
+        uint64_t hash = 0;
+        for (size_t i = 0; i < numChars; ++i)
+        {
+            hash = uint64_t(int64_t(buffer[i])) + (hash << 6) + (hash << 16) - hash;
+        }
+        return hash;
+    }
+
 	template<int IsInt>
 	class Hash
 	{
@@ -111,4 +122,4 @@ namespace Slang
     }
 }
 
-#endif
\ No newline at end of file
+#endif