Merge pull request #2425 from XavierAubert/cv32e40p/dev_bnl_ww19_PR

CV32E40Pv2 Verification update Week 19 PR
openhwgroup · May 10, 2024 · 88586e7 · 88586e7
2 parents db5591f + 3bb659a
commit 88586e7
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diff --git a/cv32e40p/docs/VerifPlans/Simulation/Zfinx_F_instructions/CV32E40P_F-Zfinx-instructions.xlsx b/cv32e40p/docs/VerifPlans/Simulation/Zfinx_F_instructions/CV32E40P_F-Zfinx-instructions.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40P_debug.xlsx b/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40P_debug.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40P_external-debugger.xlsx b/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40P_external-debugger.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40Pv2_debug.xlsx b/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40Pv2_debug.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40Pv2_external-debugger.xlsx b/cv32e40p/docs/VerifPlans/Simulation/debug-trace/CV32E40Pv2_external-debugger.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/interrupts/CV32E40P_interrupts.xlsx b/cv32e40p/docs/VerifPlans/Simulation/interrupts/CV32E40P_interrupts.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/interrupts/CV32E40Pv2_interrupts.xlsx b/cv32e40p/docs/VerifPlans/Simulation/interrupts/CV32E40Pv2_interrupts.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/micro_architecture/CV32E40P_FPU_register_file.xlsx b/cv32e40p/docs/VerifPlans/Simulation/micro_architecture/CV32E40P_FPU_register_file.xlsx
diff --git a/...s/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-bitmanipulations.xlsx b/...s/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-bitmanipulations.xlsx
diff --git a/...p/docs/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-general-alu.xlsx b/...p/docs/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-general-alu.xlsx
diff --git a/cv32e40p/docs/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-hwloop.xlsx b/cv32e40p/docs/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-hwloop.xlsx
diff --git a/...erifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-immediate-branching.xlsx b/...erifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-immediate-branching.xlsx
diff --git a/...erifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-multiply-accumulate.xlsx b/...erifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-multiply-accumulate.xlsx
diff --git a/...p/docs/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-packed-simd.xlsx b/...p/docs/VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-packed-simd.xlsx
diff --git a/.../VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-postinc-loadstore.xlsx b/.../VerifPlans/Simulation/xpulp_instruction_extensions/CV32E40P_xpulp-postinc-loadstore.xlsx
diff --git a/cv32e40p/env/corev-dv/cv32e40p_instr_test_pkg.sv b/cv32e40p/env/corev-dv/cv32e40p_instr_test_pkg.sv
@@ -364,7 +364,13 @@ package cv32e40p_instr_test_pkg;
       instr.push_back($sformatf("srli x%0d, x%0d, 13", cfg_corev.gpr[0], cfg_corev.gpr[0]));
       instr.push_back($sformatf("andi x%0d, x%0d, 0x3", cfg_corev.gpr[0], cfg_corev.gpr[0]));  //Check MSTATUS.FS bit
       instr.push_back($sformatf("li x%0d, 0x%0x", cfg_corev.gpr[1], 3));
-      instr.push_back($sformatf("bne x%0d, x%0d, 2f", cfg_corev.gpr[0], cfg_corev.gpr[1])); // MSTATUS.FS!=3 do not push
+      if (cfg_corev.enable_nested_interrupt) begin
+        // fixme: refer workaround_1
+        instr.push_back($sformatf("# bne x%0d, x%0d, 2f # workaround for mstatus.FS during nested irq", cfg_corev.gpr[0], cfg_corev.gpr[1])); // MSTATUS.FS!=3 do not push
+      end
+      else begin
+        instr.push_back($sformatf("bne x%0d, x%0d, 2f", cfg_corev.gpr[0], cfg_corev.gpr[1])); // MSTATUS.FS!=3 do not push
+      end
 
       // Reserve space from kernel stack to save all 32 FPR + FCSR
       instr.push_back($sformatf("addi x%0d, x%0d, -%0d", sp, sp, 33 * (XLEN/8)));
@@ -442,18 +448,31 @@ package cv32e40p_instr_test_pkg;
 
       // Pop MSTATUS.FS from kernel stack
       instr.push_back($sformatf("%0s  x%0d, %0d(x%0d)", load_instr, cfg_corev.gpr[0], 0, sp));
+
       // Restore MSTATUS.FS
-      instr.push_back($sformatf("li x%0d, 0x%0x", cfg_corev.gpr[1], 3));  //Clear FS
-      instr.push_back($sformatf("slli x%0d, x%0d, 13", cfg_corev.gpr[1], cfg_corev.gpr[1]));
-      instr.push_back($sformatf("csrrc x0, 0x%0x, x%0d # %0s", status, cfg_corev.gpr[1], status.name()));
-      instr.push_back($sformatf("slli x%0d, x%0d, 13", cfg_corev.gpr[1], cfg_corev.gpr[0]));
-      instr.push_back($sformatf("csrrs x0, 0x%0x, x%0d # %0s", status, cfg_corev.gpr[1], status.name()));
+      if (cfg_corev.enable_nested_interrupt) begin
+        // fixme: refer workaround_1
+        // do not clear FS
+      end
+      else begin
+        instr.push_back($sformatf("li x%0d, 0x%0x", cfg_corev.gpr[1], 3));  //Clear FS
+        instr.push_back($sformatf("slli x%0d, x%0d, 13", cfg_corev.gpr[1], cfg_corev.gpr[1]));
+        instr.push_back($sformatf("csrrc x0, 0x%0x, x%0d # %0s", status, cfg_corev.gpr[1], status.name()));
+        instr.push_back($sformatf("slli x%0d, x%0d, 13", cfg_corev.gpr[1], cfg_corev.gpr[0]));
+        instr.push_back($sformatf("csrrs x0, 0x%0x, x%0d # %0s", status, cfg_corev.gpr[1], status.name()));
+      end
 
       // Restore kernel stack pointer
       instr.push_back($sformatf("addi x%0d, x%0d, %0d", sp, sp, 1 * (XLEN/8)));
 
       instr.push_back($sformatf("li x%0d, 0x%0x", cfg_corev.gpr[1], 3));
-      instr.push_back($sformatf("bne x%0d, x%0d, 2f", cfg_corev.gpr[0], cfg_corev.gpr[1])); // MSTATUS.FS!=3 do not pop FPR
+      if (cfg_corev.enable_nested_interrupt) begin
+        // fixme: refer workaround_1
+        instr.push_back($sformatf("# bne x%0d, x%0d, 2f # workaround for mstatus.FS during nested irq", cfg_corev.gpr[0], cfg_corev.gpr[1])); // MSTATUS.FS!=3 do not pop FPR
+      end
+      else begin
+        instr.push_back($sformatf("bne x%0d, x%0d, 2f", cfg_corev.gpr[0], cfg_corev.gpr[1])); // MSTATUS.FS!=3 do not pop FPR
+      end
 
       randcase
         1: load_instr = (FLEN == 32) ? "flw" : "fld";
@@ -478,6 +497,15 @@ package cv32e40p_instr_test_pkg;
 
     end
 
+    // fixme: the irq handling logic flow need to be rework to consider nested irq scenario for fpu csr such as FS.  
+    // workaround_1 for MSTATUS.FS during nested irq by assuming FS always DIRTY prior irq handling.
+    if (cfg_corev.enable_nested_interrupt) begin
+      // always set FS to DIRTY prior mret
+      instr.push_back($sformatf("li x%0d, 0x3             # workaround for mstatus.FS during nested irq", cfg_corev.gpr[1]));
+      instr.push_back($sformatf("slli x%0d, x%0d, 13      # workaround for mstatus.FS during nested irq", cfg_corev.gpr[1], cfg_corev.gpr[1]));
+      instr.push_back($sformatf("csrrs x0, mstatus, x%0d  # workaround for mstatus.FS during nested irq", cfg_corev.gpr[1]));
+    end
+
     load_instr = (XLEN == 32) ? "lw" : "ld";
     // Pop user mode GPRs from kernel stack
     for(int i = 1; i < 32; i++) begin

diff --git a/cv32e40p/env/uvme/cov/uvme_cv32e40p_zfinx_instr_covg.sv b/cv32e40p/env/uvme/cov/uvme_cv32e40p_zfinx_instr_covg.sv
@@ -65,7 +65,7 @@ class uvme_cv32e40p_zfinx_instr_covg extends uvm_component;
      ignore_bins cur_fpu_wo_rs3 = !binsof(cp_cur_is_fpu_instr) intersect {`RV32ZFINX_INSTR_W_RS3};
 
     `define IGNORE_BINS_NON_RS1_CV32E40P_INSTR \
-     ignore_bins non_rs1_rv32_instr = binsof(cp_id_stage_non_rv32fc_inst) intersect {TB_OPCODE_LUI,TB_OPCODE_AUIPC,TB_OPCODE_JAL};
+     ignore_bins non_rs1_rv32_instr = binsof(cp_id_stage_non_rv32fc_inst) intersect {`RV32_OPCODE_WITH_NO_RS1};
 
     `define IGNORE_BINS_NON_RS2_CV32E40P_INSTR \
      ignore_bins non_rs2_rv32_instr = binsof(cp_id_stage_non_rv32fc_inst) intersect {`RV32_OPCODE_WITH_NO_RS2};

diff --git a/cv32e40p/env/uvme/uvme_cv32e40p_macros.sv b/cv32e40p/env/uvme/uvme_cv32e40p_macros.sv
@@ -32,8 +32,11 @@
   TB_OPCODE_OP, TB_OPCODE_OPIMM, TB_OPCODE_LOAD, TB_OPCODE_JALR, TB_OPCODE_JAL, TB_OPCODE_AUIPC, TB_OPCODE_LUI, \
   OPCODE_CUSTOM_0, OPCODE_CUSTOM_1, OPCODE_CUSTOM_2, OPCODE_CUSTOM_3
 
+`define RV32_OPCODE_WITH_NO_RS1 \
+  TB_OPCODE_LUI,TB_OPCODE_AUIPC,TB_OPCODE_JAL,TB_OPCODE_FENCE
+
 `define RV32_OPCODE_WITH_NO_RS2 \
-  TB_OPCODE_LUI,TB_OPCODE_AUIPC,TB_OPCODE_JAL,TB_OPCODE_JALR,TB_OPCODE_LOAD,TB_OPCODE_OPIMM,TB_OPCODE_FENCE,TB_OPCODE_SYSTEM
+  TB_OPCODE_LUI,TB_OPCODE_AUIPC,TB_OPCODE_JAL,TB_OPCODE_JALR,TB_OPCODE_LOAD,TB_OPCODE_OPIMM,TB_OPCODE_FENCE,TB_OPCODE_SYSTEM,OPCODE_CUSTOM_0
 
 `define RV32F_INSTR_WITH_FS1 \
   TB_INS_FMADD, TB_INS_FNMADD, TB_INS_FMSUB, TB_INS_FNMSUB, TB_INS_FADD, TB_INS_FSUB, TB_INS_FMUL, TB_INS_FDIV, TB_INS_FSQRT, \

diff --git a/cv32e40p/regress/cv32e40pv2_interrupt_debug_long.yaml b/cv32e40p/regress/cv32e40pv2_interrupt_debug_long.yaml
@@ -21,6 +21,18 @@ builds:
 
 # List of tests
 tests:
+  corev_rand_interrupt_wfi:
+    build: uvmt_cv32e40p
+    description: corev_rand_interrupt_wfi
+    dir: cv32e40p/sim/uvmt
+    cmd: make gen_corev-dv test COREV=YES TEST=corev_rand_interrupt_wfi CFG_PLUSARGS="+UVM_TIMEOUT=30000000"
+
+  corev_rand_interrupt_wfi_mem_stress:
+    build: uvmt_cv32e40p
+    description: corev_rand_interrupt_wfi_mem_stress
+    dir: cv32e40p/sim/uvmt
+    cmd: make gen_corev-dv test COREV=YES TEST=corev_rand_interrupt_wfi_mem_stress CFG_PLUSARGS="+UVM_TIMEOUT=50000000"
+
   corev_rand_debug:
     build: uvmt_cv32e40p
     description: corev_rand_debug
@@ -69,23 +81,11 @@ tests:
     dir: cv32e40p/sim/uvmt
     cmd: make gen_corev-dv test COREV=YES TEST=corev_rand_interrupt_exception CFG_PLUSARGS="+UVM_TIMEOUT=30000000"
 
-#  corev_rand_interrupt_nested:
-#    build: uvmt_cv32e40p
-#    description: corev_rand_interrupt_nested
-#    dir: cv32e40p/sim/uvmt
-#    cmd: make gen_corev-dv test COREV=YES TEST=corev_rand_interrupt_nested CFG_PLUSARGS="+UVM_TIMEOUT=30000000"
-
-  corev_rand_interrupt_wfi:
+  corev_rand_interrupt_nested:
     build: uvmt_cv32e40p
-    description: corev_rand_interrupt_wfi
+    description: corev_rand_interrupt_nested
     dir: cv32e40p/sim/uvmt
-    cmd: make gen_corev-dv test COREV=YES TEST=corev_rand_interrupt_wfi CFG_PLUSARGS="+UVM_TIMEOUT=30000000"
-
-  corev_rand_interrupt_wfi_mem_stress:
-    build: uvmt_cv32e40p
-    description: corev_rand_interrupt_wfi_mem_stress
-    dir: cv32e40p/sim/uvmt
-    cmd: make gen_corev-dv test COREV=YES TEST=corev_rand_interrupt_wfi_mem_stress CFG_PLUSARGS="+UVM_TIMEOUT=50000000"
+    cmd: make gen_corev-dv test COREV=YES TEST=corev_rand_interrupt_nested CFG_PLUSARGS="+UVM_TIMEOUT=30000000"
 
 # list of corev_rand_pulp_hwloop_debug - START
 

diff --git a/cv32e40p/sim/tools/vsim/exclusion/cv32e40pv2_code_fpu_cfg_waiver.do b/cv32e40p/sim/tools/vsim/exclusion/cv32e40pv2_code_fpu_cfg_waiver.do
@@ -30,7 +30,10 @@ coverage exclude -line 226 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_t
 coverage exclude -line 227 -code s -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {flush_i set to 1'b0}
 coverage exclude -line 228 -code s -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {flush_i set to 1'b0}
 coverage exclude -line 229 -code s -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {flush_i set to 1'b0}
-coverage exclude -line 292 -code c -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {flush_i set to 1'b0}
+coverage exclude -line 287 -code c -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {Specific combination is unreachable. Proven with Formal.}
+coverage exclude -line 287 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {Specific combination is unreachable. Proven with Formal.}
+coverage exclude -line 288 -code s -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {Specific combination is unreachable. Proven with Formal.}
+coverage exclude -feccondrow 292 4 -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {flush_i set to 1'b0}
 coverage exclude -line 415 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {out_ready is stuck to 1. We never go to hold state.}
 coverage exclude -line 416 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {out_ready is stuck to 1. We never go to hold state.}
 coverage exclude -line 424 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[1]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/genblk1/i_fpnew_divsqrt_multi_th} -comment {out_ready is stuck to 1. We never go to hold state.}
@@ -377,3 +380,7 @@ coverage exclude -line 101 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_t
 coverage exclude -line 101 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[0]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/i_fpnew_fma_multi/i_lzc/gen_lzc/g_levels[4]/g_not_last_level/g_level[13]} -comment {this part of leading zero counter is not used.}
 coverage exclude -line 101 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[0]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/i_fpnew_fma_multi/i_lzc/gen_lzc/g_levels[4]/g_not_last_level/g_level[14]} -comment {this part of leading zero counter is not used.}
 coverage exclude -line 101 -code b -scope {/uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/fpu_gen/fp_wrapper_i/i_fpnew_bulk/gen_operation_groups[0]/i_opgroup_block/gen_merged_slice/i_multifmt_slice/gen_num_lanes[0]/active_lane/lane_instance/i_fpnew_fma_multi/i_lzc/gen_lzc/g_levels[4]/g_not_last_level/g_level[15]} -comment {this part of leading zero counter is not used.}
+coverage exclude -feccondrow 211 4 -scope /uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/core_i/ex_stage_i -comment {one specific condition (row4) is unreachable. Proven with Formal. We never apu_en_1 and regfile_alu_we at the same time.}
+coverage exclude -feccondrow 237 5 -scope /uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/core_i/ex_stage_i -comment {one specific condition (Row5) is unreachable. Proven with Formal.}
+coverage exclude -feccondrow 241 5 -scope /uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/core_i/ex_stage_i -comment {one specific condition (Row5) is unreachable. Proven with Formal.}
+coverage exclude -feccondrow 387 22 -scope /uvmt_cv32e40p_tb/dut_wrap/cv32e40p_tb_wrapper_i/cv32e40p_top_i/core_i/ex_stage_i -comment {unreachable in FPU config. It only could be hit with Z config for apu_read_dep_for_jalr.}
diff --git a/cv32e40p/tests/programs/custom/debug_hwloop_test/trigger_code.S b/cv32e40p/tests/programs/custom/debug_hwloop_test/trigger_code.S
@@ -1,4 +1,4 @@
-#Copyright 202[x] Silicon Labs, Inc.
+#Copyright (c) 2024 Dolphin Design
 #  
 #This file, and derivatives thereof are licensed under the
 #Solderpad License, Version 2.0 (the "License");

diff --git a/cv32e40p/tests/programs/custom/fpu_func_cov_improve_test/fpu_func_cov_improve_test.S b/cv32e40p/tests/programs/custom/fpu_func_cov_improve_test/fpu_func_cov_improve_test.S
@@ -1511,6 +1511,72 @@ _jrsw31:fsw     f31, -8(x31)
         cv.lbu      x31, (x1), 4
         fcvt.s.wu   f31, x31
 
+        # 20
+        auipc   x0, 0x40000
+        flw     f0, 0(x0)
+        auipc   x1, 0x40000
+        flw     f1, 0(x1)
+        auipc   x2, 0x40000
+        flw     f2, 0(x2)
+        auipc   x3, 0x40000
+        flw     f3, 0(x3)
+        auipc   x4, 0x40000
+        flw     f4, 0(x4)
+        auipc   x5, 0x40000
+        flw     f5, 0(x5)
+        auipc   x6, 0x40000
+        flw     f6, 0(x6)
+        auipc   x7, 0x40000
+        flw     f7, 0(x7)
+        auipc   x8, 0x40000
+        flw     f8, 0(x8)
+        auipc   x9, 0x40000
+        flw     f9, 0(x9)
+        auipc   x10, 0x40000
+        flw     f10, 0(x10)
+        auipc   x11, 0x40000
+        flw     f11, 0(x11)
+        auipc   x12, 0x40000
+        flw     f12, 0(x12)
+        auipc   x13, 0x40000
+        flw     f13, 0(x13)
+        auipc   x14, 0x40000
+        flw     f14, 0(x14)
+        auipc   x15, 0x40000
+        flw     f15, 0(x15)
+        auipc   x16, 0x40000
+        flw     f16, 0(x16)
+        auipc   x17, 0x40000
+        flw     f17, 0(x17)
+        auipc   x18, 0x40000
+        flw     f18, 0(x18)
+        auipc   x19, 0x40000
+        flw     f19, 0(x19)
+        auipc   x20, 0x40000
+        flw     f20, 0(x20)
+        auipc   x21, 0x40000
+        flw     f21, 0(x21)
+        auipc   x22, 0x40000
+        flw     f22, 0(x22)
+        auipc   x23, 0x40000
+        flw     f23, 0(x23)
+        auipc   x24, 0x40000
+        flw     f24, 0(x24)
+        auipc   x25, 0x40000
+        flw     f25, 0(x25)
+        auipc   x26, 0x40000
+        flw     f26, 0(x26)
+        auipc   x27, 0x40000
+        flw     f27, 0(x27)
+        auipc   x28, 0x40000
+        flw     f28, 0(x28)
+        auipc   x29, 0x40000
+        flw     f29, 0(x29)
+        auipc   x30, 0x40000
+        flw     f30, 0(x30)
+        auipc   x31, 0x40000
+        flw     f31, 0(x31)
+
       # for uvme_cv32e40p_fp_instr_covg/cg_f_inst_reg/cr_non_rv32f_rd_rv32f_rs1 - end
     ######### FOR PULP_FPU CFG - END   #########