Fix for performance regression (PR #4218, Fixes #4209)

tederis · web-flow · commit 9084552d76b1 · 2025-05-10T18:15:37.000+02:00
Lua string hash calculation fix
diff --git a/vendor/lua/src/lstring.c b/vendor/lua/src/lstring.c
@@ -107,7 +107,7 @@ Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
 
 LUALIB_API unsigned int luaS_hash(const char *str, size_t l)
 {
-    if (!str || str[0] == '\0' || l == 0)
+    if (!str || l == 0)
         return 0;
 
     unsigned int h = cast(unsigned int, l);  /* seed */

Original file line number	Diff line number	Diff line change
`@@ -107,7 +107,7 @@ Udata luaS_newudata (lua_State L, size_t s, Table *e) {`
`107`	`107`
`108`	`108`	`LUALIB_API unsigned int luaS_hash(const char *str, size_t l)`
`109`	`109`	`{`
`110`		`- if (!str \|\| str[0] == '\0' \|\| l == 0)`
	`110`	`+ if (!str \|\| l == 0)`
`111`	`111`	`return 0;`
`112`	`112`
`113`	`113`	`unsigned int h = cast(unsigned int, l); /* seed */`