Branch: check op_a for equaliity against R0 instead testing of explicitly against zero

git-svn-id: http://moon:8086/svn/vhdl/trunk@17 cc03376c-175c-47c8-b038-4cd826a8556b

lib/CPUs/MIPS/src/core/mips_pipeline.vhd

@@ -343,7 +343,7 @@ proc_stage_branch:
 					end if;
 
 				when bc_lez_gtz =>
-					if (EX_stage.ctrl.bc_not xor (bcu_flags.z or bcu_flags.ltz)) = '1' then
+					if (EX_stage.ctrl.bc_not xor (bcu_flags.eq or bcu_flags.ltz)) = '1' then
 						pc.is_branch <= true;
 					end if;