intel/fs: Get rid of MOV_DISPATCH_TO_FLAGS

We can just emit the MOV in the two places where we use this.

Reviewed-by: Matt Turner <mattst88@gmail.com>

src/intel/compiler/brw_eu_defines.h

@@ -509,7 +509,6 @@ enum opcode {
    FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN4,
    FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_GEN7,
    FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_LOGICAL,
-   FS_OPCODE_MOV_DISPATCH_TO_FLAGS,
    FS_OPCODE_DISCARD_JUMP,
    FS_OPCODE_SET_SAMPLE_ID,
    FS_OPCODE_PACK_HALF_2x16_SPLIT,

src/intel/compiler/brw_fs.cpp

@@ -962,7 +962,6 @@ fs_inst::flags_written() const
                             opcode != BRW_OPCODE_CSEL &&
                             opcode != BRW_OPCODE_IF &&
                             opcode != BRW_OPCODE_WHILE)) ||
-       opcode == FS_OPCODE_MOV_DISPATCH_TO_FLAGS ||
        opcode == SHADER_OPCODE_FIND_LIVE_CHANNEL ||
        opcode == FS_OPCODE_FB_WRITE) {
       return flag_mask(this);
@@ -6752,8 +6751,11 @@ fs_visitor::run_fs(bool allow_spilling, bool do_rep_send)
        * Initialize it with the dispatched pixels.
        */
       if (wm_prog_data->uses_kill) {
-         fs_inst *discard_init = bld.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS);
+         const fs_reg dispatch_mask =
-         discard_init->flag_subreg = 1;
+            devinfo->gen >= 6 ? brw_vec1_grf(1, 7) : brw_vec1_grf(0, 0);
+         bld.exec_all().group(1, 0)
+            .MOV(retype(brw_flag_reg(0, 1), BRW_REGISTER_TYPE_UW),
+                 retype(dispatch_mask, BRW_REGISTER_TYPE_UW));
       }
 
       /* Generate FS IR for main().  (the visitor only descends into

src/intel/compiler/brw_fs_generator.cpp

@@ -1598,30 +1598,6 @@ fs_generator::generate_varying_pull_constant_load_gen7(fs_inst *inst,
    }
 }
 
-/**
- * Cause the current pixel/sample mask (from R1.7 bits 15:0) to be transferred
- * into the flags register (f0.0).
- *
- * Used only on Gen6 and above.
- */
-void
-fs_generator::generate_mov_dispatch_to_flags(fs_inst *inst)
-{
-   struct brw_reg flags = brw_flag_subreg(inst->flag_subreg);
-   struct brw_reg dispatch_mask;
-
-   if (devinfo->gen >= 6)
-      dispatch_mask = retype(brw_vec1_grf(1, 7), BRW_REGISTER_TYPE_UW);
-   else
-      dispatch_mask = retype(brw_vec1_grf(0, 0), BRW_REGISTER_TYPE_UW);
-
-   brw_push_insn_state(p);
-   brw_set_default_mask_control(p, BRW_MASK_DISABLE);
-   brw_set_default_exec_size(p, BRW_EXECUTE_1);
-   brw_MOV(p, flags, dispatch_mask);
-   brw_pop_insn_state(p);
-}
-
 void
 fs_generator::generate_pixel_interpolator_query(fs_inst *inst,
                                                 struct brw_reg dst,
@@ -2215,10 +2191,6 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width)
          generate_fb_read(inst, dst, src[0]);
          break;
 
-      case FS_OPCODE_MOV_DISPATCH_TO_FLAGS:
-         generate_mov_dispatch_to_flags(inst);
-         break;
-
       case FS_OPCODE_DISCARD_JUMP:
          generate_discard_jump(inst);
          break;

src/intel/compiler/brw_fs_visitor.cpp

@@ -278,7 +278,9 @@ fs_visitor::emit_interpolation_setup_gen6()
        * pixels are lit.  Then, for each channel that is unlit,
        * replace the centroid data with non-centroid data.
        */
-      bld.emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS);
+      bld.exec_all().group(1, 0)
+         .MOV(retype(brw_flag_reg(0, 0), BRW_REGISTER_TYPE_UW),
+              retype(brw_vec1_grf(1, 7), BRW_REGISTER_TYPE_UW));
 
       for (int i = 0; i < BRW_BARYCENTRIC_MODE_COUNT; ++i) {
          if (!(centroid_modes & (1 << i)))

src/intel/compiler/brw_shader.cpp

@@ -400,8 +400,6 @@ brw_instruction_name(const struct gen_device_info *devinfo, enum opcode op)
    case FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_LOGICAL:
       return "varying_pull_const_logical";
 
-   case FS_OPCODE_MOV_DISPATCH_TO_FLAGS:
-      return "mov_dispatch_to_flags";
    case FS_OPCODE_DISCARD_JUMP:
       return "discard_jump";