From fc3951cfde692b682ae0a79502cd7ba3b77a68d7 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Date: Fri, 13 Feb 2026 10:58:42 -0500
Subject: [PATCH] util/bitset: add an assert for big BITSET_EXTRACT

This just bit me. Add an assert to catch the next person who doesn't
read the function signature and tries to extract 64-bits out and wonders
why things are silently broken.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39892>
---
 src/util/bitset.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/util/bitset.h b/src/util/bitset.h
index 3c90a2aaf19..bc324bc435f 100644
--- a/src/util/bitset.h
+++ b/src/util/bitset.h
@@ -282,6 +282,7 @@ __bitset_clear_range(BITSET_WORD *r, int start, int end)
 static inline unsigned
 __bitset_extract(const BITSET_WORD *r, unsigned start, unsigned count)
 {
+   assert(count <= BITSET_WORDBITS);
    unsigned shift = start % BITSET_WORDBITS;
    BITSET_WORD lower = r[BITSET_BITWORD(start)] >> shift;
    BITSET_WORD upper = shift ? r[BITSET_BITWORD(start + count - 1)] << (BITSET_WORDBITS - shift) : 0;