i965: Generalize predicated break pass for use in vec4 backend.

instructions in affected programs:     44204 -> 43762 (-1.00%)
helped:                                221

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

src/mesa/drivers/dri/i965/Makefile.sources

@@ -55,7 +55,6 @@ i965_FILES = \
 	brw_fs_live_variables.cpp \
 	brw_fs_live_variables.h \
 	brw_fs_nir.cpp \
-	brw_fs_peephole_predicated_break.cpp \
 	brw_fs_reg_allocate.cpp \
 	brw_fs_register_coalesce.cpp \
 	brw_fs_saturate_propagation.cpp \
@@ -91,6 +90,7 @@ i965_FILES = \
 	brw_packed_float.c \
 	brw_performance_monitor.c \
 	brw_pipe_control.c \
+	brw_predicated_break.cpp \
 	brw_primitive_restart.c \
 	brw_program.c \
 	brw_program.h \

src/mesa/drivers/dri/i965/brw_fs.cpp

@@ -4823,7 +4823,7 @@ fs_visitor::optimize()
       OPT(opt_algebraic);
       OPT(opt_cse);
       OPT(opt_copy_propagate);
-      OPT(opt_peephole_predicated_break);
+      OPT(opt_predicated_break, this);
       OPT(opt_cmod_propagation);
       OPT(dead_code_eliminate);
       OPT(opt_peephole_sel);

src/mesa/drivers/dri/i965/brw_predicated_break.cpp

@@ -21,12 +21,11 @@
  * IN THE SOFTWARE.
  */
 
-#include "brw_fs.h"
 #include "brw_cfg.h"
 
 using namespace brw;
 
-/** @file brw_fs_peephole_predicated_break.cpp
+/** @file brw_predicated_break.cpp
  *
  * Loops are often structured as
  *
@@ -55,11 +54,11 @@ using namespace brw;
  */
 
 bool
-fs_visitor::opt_peephole_predicated_break()
+opt_predicated_break(backend_shader *s)
 {
    bool progress = false;
 
-   foreach_block (block, cfg) {
+   foreach_block (block, s->cfg) {
       if (block->start_ip != block->end_ip)
          continue;
 
@@ -101,13 +100,13 @@ fs_visitor::opt_peephole_predicated_break()
 
       if (!earlier_block->ends_with_control_flow()) {
          earlier_block->children.make_empty();
-         earlier_block->add_successor(cfg->mem_ctx, jump_block);
+         earlier_block->add_successor(s->cfg->mem_ctx, jump_block);
       }
 
       if (!later_block->starts_with_control_flow()) {
          later_block->parents.make_empty();
       }
-      jump_block->add_successor(cfg->mem_ctx, later_block);
+      jump_block->add_successor(s->cfg->mem_ctx, later_block);
 
       if (earlier_block->can_combine_with(jump_block)) {
          earlier_block->combine_with(jump_block);
@@ -130,20 +129,20 @@ fs_visitor::opt_peephole_predicated_break()
          while_inst->predicate_inverse = !jump_inst->predicate_inverse;
 
          earlier_block->children.make_empty();
-         earlier_block->add_successor(cfg->mem_ctx, while_block);
+         earlier_block->add_successor(s->cfg->mem_ctx, while_block);
 
          assert(earlier_block->can_combine_with(while_block));
          earlier_block->combine_with(while_block);
 
          earlier_block->next()->parents.make_empty();
-         earlier_block->add_successor(cfg->mem_ctx, earlier_block->next());
+         earlier_block->add_successor(s->cfg->mem_ctx, earlier_block->next());
       }
 
       progress = true;
    }
 
    if (progress)
-      invalidate_live_intervals();
+      s->invalidate_live_intervals();
 
    return progress;
 }

src/mesa/drivers/dri/i965/brw_shader.h

@@ -219,7 +219,7 @@ enum instruction_scheduler_mode {
    SCHEDULE_POST,
 };
 
-class backend_shader {
+struct backend_shader {
 protected:
 
    backend_shader(const struct brw_compiler *compiler,
@@ -273,6 +273,8 @@ void brw_setup_image_uniform_values(gl_shader_stage stage,
                                     unsigned param_start_index,
                                     const gl_uniform_storage *storage);
 
+#else
+struct backend_shader;
 #endif /* __cplusplus */
 
 enum brw_reg_type brw_type_for_base_type(const struct glsl_type *type);
@@ -283,6 +285,8 @@ bool brw_saturate_immediate(enum brw_reg_type type, struct brw_reg *reg);
 bool brw_negate_immediate(enum brw_reg_type type, struct brw_reg *reg);
 bool brw_abs_immediate(enum brw_reg_type type, struct brw_reg *reg);
 
+bool opt_predicated_break(struct backend_shader *s);
+
 #ifdef __cplusplus
 extern "C" {
 #endif

src/mesa/drivers/dri/i965/brw_vec4.cpp

@@ -1862,6 +1862,7 @@ vec4_visitor::run()
       pass_num = 0;
       iteration++;
 
+      OPT(opt_predicated_break, this);
       OPT(opt_reduce_swizzle);
       OPT(dead_code_eliminate);
       OPT(dead_control_flow_eliminate, this);