From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 22 Apr 2019 10:26:00 +0000 (+0100)
Subject: add error reports on exceptions in LFSR2
X-Git-Tag: div_pipeline~2172
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9dd272f45cd15c5efaa090fe4fe7b79197469a2a;p=soc.git

add error reports on exceptions in LFSR2
---

diff --git a/TLB/src/LFSR2.py b/TLB/src/LFSR2.py
index d52595f5..70312272 100644
--- a/TLB/src/LFSR2.py
+++ b/TLB/src/LFSR2.py
@@ -10,15 +10,15 @@ class LFSRPolynomial(set):
         def elements():
             nonlocal max_exponent
             yield 0  # 0 is always required
-            for exponent in exponents:
-                if not isinstance(exponent, int):
-                    raise TypeError()
-                if exponent < 0:
-                    raise ValueError()
-                if exponent > max_exponent:
-                    max_exponent = exponent
-                if exponent != 0:
-                    yield exponent
+            for e in exponents:
+                if not isinstance(e, int):
+                    raise TypeError("exponent %s must be an integer" % repr(e))
+                if e < 0:
+                    raise ValueError("exponent %d must not be negative" % e)
+                if e > max_exponent:
+                    max_exponent = e
+                if e != 0: # skip zeros
+                    yield e
         set.__init__(self, elements())
         self.max_exponent = max_exponent