diff --git a/sim/regression-wally b/sim/regression-wally
index 5f4e68bf1..3864d3b3e 100755
--- a/sim/regression-wally
+++ b/sim/regression-wally
@@ -11,6 +11,9 @@
 #
 ##################################
 import sys,os,shutil
+import multiprocessing
+
+
 
 class bcolors:
     HEADER = '\033[95m'
@@ -215,6 +218,51 @@ if (nightly):
         ["div_4_4_rv64gc", ["arch64f_divsqrt", "arch64d_divsqrt", "arch64m"]],
         ["div_4_4i_rv64gc", ["arch64f_divsqrt", "arch64d_divsqrt", "arch64m"]],
 
+        ### branch predictor simulation
+
+        ["bpred_TWOBIT_6_16_10_0_rv32gc", ["embench"]],
+        ["bpred_TWOBIT_8_16_10_0_rv32gc", ["embench"]],
+        ["bpred_TWOBIT_10_16_10_0_rv32gc", ["embench"]],        
+        ["bpred_TWOBIT_12_16_10_0_rv32gc", ["embench"]],
+        ["bpred_TWOBIT_14_16_10_0_rv32gc", ["embench"]],        
+        ["bpred_TWOBIT_16_16_10_0_rv32gc", ["embench"]],
+        ["bpred_TWOBIT_6_16_10_1_rv32gc", ["embench"]],
+        ["bpred_TWOBIT_8_16_10_1_rv32gc", ["embench"]],
+        ["bpred_TWOBIT_10_16_10_1_rv32gc", ["embench"]],        
+        ["bpred_TWOBIT_12_16_10_1_rv32gc", ["embench"]],
+        ["bpred_TWOBIT_14_16_10_1_rv32gc", ["embench"]],        
+        ["bpred_TWOBIT_16_16_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_16_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_16_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_12_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_12_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_14_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_14_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_16_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_16_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_6_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_6_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_8_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_2_8_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_3_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_3_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_4_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_4_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_6_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_10_6_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_12_16_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_12_16_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_14_16_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_14_16_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_16_16_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_16_16_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_6_16_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_6_16_10_1_rv32gc", ["embench"]],
+        ["bpred_GSHARE_8_16_10_0_rv32gc", ["embench"]],
+        ["bpred_GSHARE_8_16_10_1_rv32gc", ["embench"]],
+
 #  enable floating-point tests when lint is fixed
 #        ["f_rv32gc", ["arch32f", "arch32f_divsqrt", "arch32f_fma"]],
 #        ["fh_rv32gc", ["arch32f", "arch32f_divsqrt", "arch32f_fma", "arch32zfh", "arch32zfh_divsqrt"]],
@@ -312,7 +360,7 @@ def main():
 
     # Scale the number of concurrent processes to the number of test cases, but
     # max out at a limited number of concurrent processes to not overwhelm the system
-    with Pool(processes=min(len(configs),40)) as pool:
+    with Pool(processes=min(len(configs),multiprocessing.cpu_count())) as pool:
        num_fail = 0
        results = {}
        for config in configs: