stage2 更多底层函数 stage1 layout正确使用 内置函数重新编写

stage1/spl_intrin.h

@@ -16,12 +16,15 @@ typedef enum {
     SPL_INTRIN_TRUNCATE,
     SPL_INTRIN_BIT_CAST,
     SPL_INTRIN_FLOAT_CAST,
-    SPL_INTRIN_INT_FROM_FLOAT,
-    SPL_INTRIN_FLOAT_FROM_INT,
-    SPL_INTRIN_INT_FROM_BOOL,
-    SPL_INTRIN_INT_FROM_PTR,
-    SPL_INTRIN_PTR_FROM_INT,
+    SPL_INTRIN_FLOAT2INT,
+    SPL_INTRIN_INT2FLOAT,
+    SPL_INTRIN_BOOL2INT,
+    SPL_INTRIN_PTR2INT,
+    SPL_INTRIN_INT2PTR,
     SPL_INTRIN_PTR_CAST,
+    SPL_INTRIN_ENUM2INT,
+    SPL_INTRIN_OFFSETOF,
+    SPL_INTRIN_FIELD_COUNT,
 } spl_intrin_t;
 
 typedef enum {