IR generation cleanup work

- Make all instructions store their argument count for now, so we can iterate over them easily.
  - Longer term we might try to optimize for space because the common case is that the operand count is known, but keeping it simpler seems better for now

- Split apart the creation of an instruction from adding it to a parent

- Use the above capability to make sure that we add a function to its parent *after* all the parameter/result type emission has occured.

- Perform simple value numbering for types during IR creation
  - This logic also tries to pick a good parent for any type instructions, so that types don't get created local to a function unless they really need to

- Create all constants at global scope, and re-use when values are identical

1 files changed, 4 insertions, 1 deletions

diff --git a/source/core/hash.h b/source/core/hash.h
index 07a14099b..dd2086305 100644
--- a/source/core/hash.h
+++ b/source/core/hash.h
@@ -95,7 +95,10 @@ namespace Slang
 		return PointerHash<std::is_pointer<TKey>::value>::GetHashCode(key);
 	}
 
-		
+    inline int combineHash(int left, int right)
+    {
+        return (left * 16777619) ^ right;
+    }
 }
 
 #endif
\ No newline at end of file