i965/fs/generator: refactor rounding mode helper in preparation for float controls

v2:
- Fix bug in defining BRW_CR0_FP_MODE_MASK.

v3:
- Update comment (Caio).

v4:
- Split the patch into the helper (this one) and the new
  opcode (Caio).

Signed-off-by: Samuel Iglesias Gonsálvez <[email protected]>
Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>

1 files changed, 9 insertions, 2 deletions

diff --git a/src/intel/compiler/brw_fs_generator.cpp b/src/intel/compiler/brw_fs_generator.cpp
index b6e6925ac9e..48ac635bf90 100644
--- a/src/intel/compiler/brw_fs_generator.cpp
+++ b/src/intel/compiler/brw_fs_generator.cpp
@@ -2218,9 +2218,16 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width,
          brw_DIM(p, dst, retype(src[0], BRW_REGISTER_TYPE_F));
          break;
 
-      case SHADER_OPCODE_RND_MODE:
+      case SHADER_OPCODE_RND_MODE: {
          assert(src[0].file == BRW_IMMEDIATE_VALUE);
-         brw_rounding_mode(p, (brw_rnd_mode) src[0].d);
+         /*
+          * Changes the floating point rounding mode updating the control
+          * register field defined at cr0.0[5-6] bits.
+          */
+         enum brw_rnd_mode mode =
+            (enum brw_rnd_mode) (src[0].d << BRW_CR0_RND_MODE_SHIFT);
+         brw_float_controls_mode(p, mode, BRW_CR0_RND_MODE_MASK);
+      }
          break;
 
       default: