From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Mon, 27 Jun 2022 09:54:54 +0000 (+0100)
Subject: clarify bmask.py
X-Git-Tag: opf_rfc_ls005_v1~1500
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=174bfcf775aaf77be10614a7e7ed8a4c348d44cd;p=libreriscv.git

clarify bmask.py
---

diff --git a/openpower/sv/bmask.py b/openpower/sv/bmask.py
index e30f8a29e..f64708bce 100644
--- a/openpower/sv/bmask.py
+++ b/openpower/sv/bmask.py
@@ -1,7 +1,8 @@
-def bmask(bm, RA, RB=None, zero=False):
-    mask = RB if RB is not None else 0xffffffffffffffff
+def bmask(bm, RA, RB=None, zero=False, XLEN=64):
+    mask = RB if RB is not None else ((1<<XLEN)-1)
     ra = RA & mask
-    a1 = ra if bm&1 else ~ra
+    mode1 = bm&1
+    a1 = ra if mode1 else ~ra
     mode2 = (bm >> 1) & 0b11
     if mode2 == 0: a2 = -ra
     if mode2 == 1: a2 = ra-1