From e8137404b6559b1c4c3b8cfefa2eb385d394364d Mon Sep 17 00:00:00 2001
From: Mary Guillemard <mary.guillemard@collabora.com>
Date: Tue, 17 Jun 2025 10:32:30 +0200
Subject: [PATCH] meson: make clz available in OpenCL code

for various math helpers.

the clzll version isn't available since long long is 128-bit for CL.

Signed-off-by: Mary Guillemard <mary.guillemard@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35639>
---
 meson.build | 1 +
 1 file changed, 1 insertion(+)

diff --git a/meson.build b/meson.build
index 604c4a7e00d..555ea834764 100644
--- a/meson.build
+++ b/meson.build
@@ -57,6 +57,7 @@ cl_args = [
 
   # Declare supported clang builtins since we don't autodetect for OpenCL
   '-DHAVE___BUILTIN_FFS',
+  '-DHAVE___BUILTIN_CLZ',
 ]
 
 if with_mesa_ndebug