From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 28 Apr 2019 13:52:11 +0000 (+0100)
Subject: add convenience routines
X-Git-Tag: ls180-24jan2020~1156
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1aaea99652a8cc66c01f63ee473c4ee7a4a42bdd;p=ieee754fpu.git

add convenience routines
---

diff --git a/src/add/fsqrt.py b/src/add/fsqrt.py
index c2d32a7a..f82e8dc6 100644
--- a/src/add/fsqrt.py
+++ b/src/add/fsqrt.py
@@ -60,6 +60,17 @@ def set_exponent(x, e):
 def get_sign(x):
     return ((x & 0x80000000) >> 31)
 
+# convert FP32 to s/e/m
+def create_fp32(s, e, m):
+    """ receive sign, exponent, mantissa, return FP32 """
+    return set_exponent((s << 31) | get_mantissa(m))
+
+# convert s/e/m to FP32
+def decode_fp32(x):
+    """ receive FP32, return sign, exponent, mantissa """
+    return get_sign(x), get_exponent(x), get_mantissa(x)
+
+
 # main function, takes mantissa and exponent as separate arguments
 # returns a tuple, sqrt'd mantissa, sqrt'd exponent