From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 19 Jun 2020 20:29:30 +0000 (+0100)
Subject: add comments on trunc_div and trunc_rem
X-Git-Tag: div_pipeline~307
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8920df310fc7ac51a59cd7be4bb9be23bf26bd42;p=soc.git

add comments on trunc_div and trunc_rem
---

diff --git a/src/soc/decoder/helpers.py b/src/soc/decoder/helpers.py
index ef6610e5..6b61ffca 100644
--- a/src/soc/decoder/helpers.py
+++ b/src/soc/decoder/helpers.py
@@ -10,6 +10,8 @@ def exts(value, bits):
     sign = 1 << (bits - 1)
     return (value & (sign - 1)) - (value & sign)
 
+
+# this is a POWER ISA 3.0B compatible div function
 def trunc_div(n, d):
     f = getattr(n, "trunc_div", None)
     if f is not None:
@@ -24,6 +26,8 @@ def trunc_div(n, d):
         return abs_q
     return -abs_q
 
+
+# this is a POWER ISA 3.0B compatible mod / remainder function
 def trunc_rem(n, d):
     f = getattr(n, "trunc_rem", None)
     if f is not None: