clarify bmask.py

diff --git a/openpower/sv/bmask.py b/openpower/sv/bmask.py
index e30f8a29ea24f256847121d3d8ad1b35bb3cbaa0..f64708bce54c8baffd11b631f38af31403b58237 100644 (file)
--- 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