i965/fs: Use a helper function for checking for flow control instructions.

In 2 of our checks, we were missing BREAK and CONTINUE.

NOTE: Candidate for the stable branches.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

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

@@ -327,6 +327,23 @@ fs_inst::is_math()
            opcode == SHADER_OPCODE_POW);
 }
 
+bool
+fs_inst::is_control_flow()
+{
+   switch (opcode) {
+   case BRW_OPCODE_DO:
+   case BRW_OPCODE_WHILE:
+   case BRW_OPCODE_IF:
+   case BRW_OPCODE_ELSE:
+   case BRW_OPCODE_ENDIF:
+   case BRW_OPCODE_BREAK:
+   case BRW_OPCODE_CONTINUE:
+      return true;
+   default:
+      return false;
+   }
+}
+
 bool
 fs_inst::is_send_from_grf()
 {
@@ -2070,16 +2087,12 @@ fs_visitor::compute_to_mrf()
 	    break;
 	 }
 
-	 /* We don't handle flow control here.  Most computation of
+	 /* We don't handle control flow here.  Most computation of
 	  * values that end up in MRFs are shortly before the MRF
 	  * write anyway.
 	  */
-	 if (scan_inst->opcode == BRW_OPCODE_DO ||
-	     scan_inst->opcode == BRW_OPCODE_WHILE ||
-	     scan_inst->opcode == BRW_OPCODE_ELSE ||
-	     scan_inst->opcode == BRW_OPCODE_ENDIF) {
+	 if (scan_inst->is_control_flow() && scan_inst->opcode != BRW_OPCODE_IF)
 	    break;
-	 }
 
 	 /* You can't read from an MRF, so if someone else reads our
 	  * MRF's source GRF that we wanted to rewrite, that stops us.
@@ -2163,16 +2176,8 @@ fs_visitor::remove_duplicate_mrf_writes()
    foreach_list_safe(node, &this->instructions) {
       fs_inst *inst = (fs_inst *)node;
 
-      switch (inst->opcode) {
-      case BRW_OPCODE_DO:
-      case BRW_OPCODE_WHILE:
-      case BRW_OPCODE_IF:
-      case BRW_OPCODE_ELSE:
-      case BRW_OPCODE_ENDIF:
+      if (inst->is_control_flow()) {
 	 memset(last_mrf_move, 0, sizeof(last_mrf_move));
-	 continue;
-      default:
-	 break;
       }
 
       if (inst->opcode == BRW_OPCODE_MOV &&

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

@@ -178,6 +178,7 @@ public:
    bool overwrites_reg(const fs_reg &reg);
    bool is_tex();
    bool is_math();
+   bool is_control_flow();
    bool is_send_from_grf();
 
    fs_reg dst;

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

@@ -816,15 +816,8 @@ fs_visitor::schedule_instructions(bool post_reg_alloc)
 	 next_block_header = (fs_inst *)next_block_header->next;
 
 	 sched.add_inst(inst);
-	 if (inst->opcode == BRW_OPCODE_IF ||
-	     inst->opcode == BRW_OPCODE_ELSE ||
-	     inst->opcode == BRW_OPCODE_ENDIF ||
-	     inst->opcode == BRW_OPCODE_DO ||
-	     inst->opcode == BRW_OPCODE_WHILE ||
-	     inst->opcode == BRW_OPCODE_BREAK ||
-	     inst->opcode == BRW_OPCODE_CONTINUE) {
+         if (inst->is_control_flow())
 	    break;
-	 }
       }
       sched.calculate_deps();
       sched.schedule_instructions(next_block_header);