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add convenience routines
author
Luke Kenneth Casson Leighton
<lkcl@lkcl.net>
Sun, 28 Apr 2019 13:52:11 +0000
(14:52 +0100)
committer
Luke Kenneth Casson Leighton
<lkcl@lkcl.net>
Sun, 28 Apr 2019 13:52:11 +0000
(14:52 +0100)
src/add/fsqrt.py
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diff --git
a/src/add/fsqrt.py
b/src/add/fsqrt.py
index c2d32a7acbbdf4c3e3cb84d0465be4ba52bcc392..f82e8dc6d98bae03d7d3a2fe65986a5426e2940f 100644
(file)
--- 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)
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
# main function, takes mantissa and exponent as separate arguments
# returns a tuple, sqrt'd mantissa, sqrt'd exponent