From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 1 Dec 2021 13:43:51 +0000 (+0000)
Subject: add a proper twin addi regression which tests ReservationStations
X-Git-Tag: sv_maxu_works-initial~681
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4328f255d67d40ce7caef6b42799bcab2ec5a733;p=openpower-isa.git

add a proper twin addi regression which tests ReservationStations
increase number of operations in hazard random test to 20
---

diff --git a/src/openpower/test/general/overlap_hazards.py b/src/openpower/test/general/overlap_hazards.py
index 24cd6903..50f54fe6 100644
--- a/src/openpower/test/general/overlap_hazards.py
+++ b/src/openpower/test/general/overlap_hazards.py
@@ -187,7 +187,7 @@ class RandomHazardTestCase(TestAccumulatorBase):
         selection_1 = ['mulli', 'addi']
         selection_2 = ['mullw', 'add']
         rrange = 8
-        n_ops = 10
+        n_ops = 20
         lst = []
         for i in range(n_ops):
             if random.randint(0, 1) == 0:
@@ -208,8 +208,16 @@ class RandomHazardTestCase(TestAccumulatorBase):
             initial_regs[i] = random.randint(-20, +20)
         self.add_case(Program(lst, bigendian), initial_regs)
 
-    def case_regression(self):
+    def case_twin_addi_regression(self):
+        """twin addi instruction with double-dependencies.
+        useful for testing ReservationStations
+        """
         lst = ['addi 1,8,14',
                'addi 3,0,5',
                'mulli 1,3,-11'
               ]
+        initial_regs = [0] * 32
+        for i in range(10):
+            initial_regs[i] = i
+        self.add_case(Program(lst, bigendian), initial_regs)
+