pad the instructions array and comment why

yamt · May 7, 2024 · cbcc1c2 · cbcc1c2
1 parent fade19d
commit cbcc1c2
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/lib/insn.c b/lib/insn.c
@@ -932,7 +932,12 @@ const static struct instruction_desc instructions_fe[] = {
 };
 #endif
 
-const struct instruction_desc instructions[] = {
+/*
+ * Note: as 0xfc is occupied unconditionally anyway, allocating up to
+ * 0xff below doesn't waste much space. on the other hand, it might allow
+ * a few optimizations in the parser by allowing full uint8_t index.
+ */
+const struct instruction_desc instructions[256] = {
 #include "insn_list_base.h"
 #if defined(TOYWASM_ENABLE_WASM_TAILCALL)
 #include "insn_list_tailcall.h"