id_stage: add a signal to indicate whether or not there is a CF

Signed-off-by: Alban Gruin <alban.gruin@irit.fr>

src/ariane.sv

@@ -95,6 +95,7 @@ module ariane import ariane_pkg::*; #(
   // ID -> verifier
   // --------------
   logic                     has_mem_access_id_verif;
+  logic                     has_ctrl_flow_id_icache;
 
   // --------------
   // ISSUE -> verifier
@@ -303,6 +304,7 @@ module ariane import ariane_pkg::*; #(
     .issue_entry_valid_o        ( issue_entry_valid_id_issue ),
     .is_ctrl_flow_o             ( is_ctrl_fow_id_issue       ),
     .is_mem_instr_o             ( has_mem_access_id_verif    ),
+    .has_ctrl_flow_o            ( has_ctrl_flow_id_icache    ),
     .issue_instr_ack_i          ( issue_instr_issue_id       ),
 
     .priv_lvl_i                 ( priv_lvl                   ),

src/id_stage.sv

@@ -38,7 +38,8 @@ module id_stage (
     input  logic                          tvm_i,
     input  logic                          tw_i,
     input  logic                          tsr_i,
-    output logic                          is_mem_instr_o
+    output logic                          is_mem_instr_o,
+    output logic                          has_ctrl_flow_o      // speculative CF (ie. no jals)
 );
     // ID/ISSUE register stage
     struct packed {
@@ -96,6 +97,7 @@ module id_stage (
     assign issue_entry_o = issue_q.sbe;
     assign issue_entry_valid_o = issue_q.valid;
     assign is_ctrl_flow_o = issue_q.is_ctrl_flow;
+    assign has_ctrl_flow_o = issue_q.valid && issue_q.is_ctrl_flow && issue_q.sbe.op != ariane_pkg::ADD;
 
     assign is_mem_instr_o = is_mem_instr_q;