intel/tools: Disallow control subregisters > 3

> 4 was probably a typo, since the documentation says that there are 4
subregisters (0-3).

Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5514>

diff --git a/src/intel/tools/i965_gram.y b/src/intel/tools/i965_gram.y
index e236113771c618abb1e99c55671db3e579b7223b..2aaf1471c5f530f2b87ac0f16d0805e4ce18652c 100644 (file)
--- a/src/intel/tools/i965_gram.y
+++ b/src/intel/tools/i965_gram.y
@@ -1853,7 +1853,7 @@ statereg:
 controlreg:
        CONTROLREG subregnum
        {
-               if ($2 > 4)
+               if ($2 > 3)
                        error(&@2, "control sub register number %d"
                                   " out of range\n", $2);