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intel/fs: Add the group to the flag subreg number on SNB and older 

We want consistent behavior in the meaning of the flag_subreg field
between SNB and IVB+.

v2 (Jason Ekstrand):
 - Add some extra commentary

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2018-05-17 20:51:24 -07:00
parent 2aefa5e19f
commit 74b477039d
1 changed files with 7 additions and 1 deletions
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8
src/intel/compiler/brw_fs_generator.cpp
View File

@ -1815,7 +1815,13 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width)
brw_set_default_access_mode(p, BRW_ALIGN_1);
brw_set_default_predicate_control(p, inst->predicate);
brw_set_default_predicate_inverse(p, inst->predicate_inverse);
brw_set_default_flag_reg(p, inst->flag_subreg / 2, inst->flag_subreg % 2);
/* On gen7 and above, hardware automatically adds the group onto the
* flag subregister number. On Sandy Bridge and older, we have to do it
* ourselves.
*/
const unsigned flag_subreg = inst->flag_subreg +
(devinfo->gen >= 7 ? 0 : inst->group / 16);
brw_set_default_flag_reg(p, flag_subreg / 2, flag_subreg % 2);
brw_set_default_saturate(p, inst->saturate);
brw_set_default_mask_control(p, inst->force_writemask_all);
brw_set_default_acc_write_control(p, inst->writes_accumulator);