intel/fs: Fix FB write inst groups

This commit does two things.  First, it simplifies the way we compute
the FB write group bit.  There's no reason to use a ternary because
inst->group / 16 can only be 0 or 1.  Second, it fixes an order-of-
operations bug where the ternary wasn't selecting between (1 << 11) and
0 but between (1 << 11) and 0 | brw_dp_write_desc(...).

Fixes: 0d9648416 "intel/compiler: Use generic SEND for Gen7+ FB writes"
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
index 8bf11f9..381d10b 100644 (file)
--- a/src/intel/compiler/brw_fs.cpp
+++ b/src/intel/compiler/brw_fs.cpp
@@ -4447,7 +4447,7 @@ lower_fb_write_logical_send(const fs_builder &bld, fs_inst *inst,
       uint32_t ex_desc = 0;
 
       inst->desc =
-         (inst->group / 16) ? (1 << 11) : 0 | /* rt slot group */
+         (inst->group / 16) << 11 | /* rt slot group */
          brw_dp_write_desc(devinfo, inst->target, msg_ctl,
                            GEN6_DATAPORT_WRITE_MESSAGE_RENDER_TARGET_WRITE,
                            inst->last_rt, false);