From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Wed, 23 Jun 2021 15:29:54 +0000 (+0100)
Subject: add SHL64 helper function
X-Git-Tag: xlen-bcd~410
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=796d46c1d594fe406ae649aab11de8b36ead0340;p=openpower-isa.git

add SHL64 helper function
---

diff --git a/src/openpower/decoder/helpers.py b/src/openpower/decoder/helpers.py
index 4e0a1c16..dfbd0d1f 100644
--- a/src/openpower/decoder/helpers.py
+++ b/src/openpower/decoder/helpers.py
@@ -77,6 +77,14 @@ def rotl(value, bits, wordlen):
     return ((value << bits) | (value >> (wordlen-bits))) & mask
 
 
+def SHL64(value, bits, wordlen=64):
+    if isinstance(bits, SelectableInt):
+        bits = bits.value
+    mask = (1 << wordlen) - 1
+    bits = bits & (wordlen - 1)
+    return (value << bits) & mask
+
+
 def ROTL64(value, bits):
     return rotl(value, bits, 64)
 
diff --git a/src/openpower/decoder/pseudo/pywriter.py b/src/openpower/decoder/pseudo/pywriter.py
index 58b29052..67a4cbc6 100644
--- a/src/openpower/decoder/pseudo/pywriter.py
+++ b/src/openpower/decoder/pseudo/pywriter.py
@@ -25,7 +25,7 @@ from openpower.decoder.helpers import (EXTS, EXTS64, EXTZ64, ROTL64, ROTL32,
                                  ne, eq, gt, ge, lt, le, ltu, gtu, length,
                                  trunc_divs, trunc_rems, MULS, DIVS, MODS,
                                  EXTS128, undefined,
-                                 bitrev,
+                                 bitrev, SHL64,
                                 )
 from openpower.decoder.selectable_int import SelectableInt
 from openpower.decoder.selectable_int import selectconcat as concat