From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 29 Nov 2023 19:29:12 +0000 (+0000)
Subject: bug #672: pospopcount working with large arrays
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fbc191bfbfd2b8f7db6dc496a59c6f73a4e625d1;p=openpower-isa.git

bug #672: pospopcount working with large arrays

pospopcount is supposed to be able to handle long arrays of data,
but it turns out that sv.lbzu/pi/dw=8 was calculating an EA in 8-bit,
meaning that it wrapped around to a zero memory address.
now this is resolved the code which has been made shorter actually works
---

diff --git a/src/openpower/decoder/isa/test_caller_svp64_pospopcount.py b/src/openpower/decoder/isa/test_caller_svp64_pospopcount.py
index 8c73ce71..06b1d764 100644
--- a/src/openpower/decoder/isa/test_caller_svp64_pospopcount.py
+++ b/src/openpower/decoder/isa/test_caller_svp64_pospopcount.py
@@ -60,21 +60,24 @@ class PosPopCountTestCase(FHDLTestCase):
         #tst_array = [254] * 10
         #tst_array = [1,2,3,4,5,6,7,8,9,10,11,12,13]
         #tst_array = [1,2,3,4,5,6,7,8,9,10,11,12,13]
+        #tst_array = [1,2,3,4,5,6,7,8,9]
         tst_array = list(range(240))
         initial_regs = [0] * 64
         initial_regs[3] = len(tst_array)
-        initial_regs[4] = 16  # load address
+        initial_regs[4] = 256-8  # load address
 
         # some memory with identifying garbage in it
         initial_mem = {16: 0xf0f1_f2f3_f4f5_f6f7,
                        24: 0x4041_4243_4445_4647,
                        40: 0x8081_8283_8485_8687,
                        48: 0x9091_9293_9495_9697,
+                       248: 0xffff_aaaa_cccc_eeee,
+                       256: 0xa0a1_a2a3_a4a5_a6a7,
                        }
 
         # overwrite the garbage with the test data
         for i, c in enumerate(tst_array):
-            write_byte(initial_mem, 16+i, c)
+            write_byte(initial_mem, initial_regs[4]+i, c)
 
         for i, c in enumerate(tst_array):
             print ("array", i, bin(c), c)