diff --git a/src/gallium/drivers/llvmpipe/lp_setup_tri.c b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
index cec6198ec63..1852ec05d56 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup_tri.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
@@ -734,7 +734,8 @@ floor_pot(uint32_t n)
 
    __asm__("bsr %1,%0"
           : "=r" (n)
-          : "rm" (n));
+          : "rm" (n)
+          : "cc");
    return 1 << n;
 #else
    n |= (n >>  1);