i965: Fix undefined signed overflow in INTEL_MASK for bitfields of 31 bits.

Most likely we had only ever used this macro on bitfields of less than
31 bits -- That's going to change shortly.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
index 3d97fda..f2994cb 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_defines.h
+++ b/src/mesa/drivers/dri/i965/brw_defines.h
@@ -29,7 +29,7 @@
   *   Keith Whitwell <keithw@vmware.com>
   */
 
-#define INTEL_MASK(high, low) (((1<<((high)-(low)+1))-1)<<(low))
+#define INTEL_MASK(high, low) (((1u<<((high)-(low)+1))-1)<<(low))
 /* Using the GNU statement expression extension */
 #define SET_FIELD(value, field)                                         \
    ({                                                                   \