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author | Tristan Gingold <tgingold@free.fr> | 2013-12-20 04:48:54 +0100 |
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committer | Tristan Gingold <tgingold@free.fr> | 2013-12-20 04:48:54 +0100 |
commit | 6c3f709174e8e4d5411f851cedb7d84c38d3b04a (patch) | |
tree | bd12c79c71a2ee65899a9ade9919ec2045addef8 /testsuite/vests/vhdl-93/ashenden/compliant/ch_06_tofp-b.vhd | |
parent | bd4aff0f670351c0652cf24e9b04361dc0e3a01c (diff) | |
download | ghdl-6c3f709174e8e4d5411f851cedb7d84c38d3b04a.tar.gz ghdl-6c3f709174e8e4d5411f851cedb7d84c38d3b04a.tar.bz2 ghdl-6c3f709174e8e4d5411f851cedb7d84c38d3b04a.zip |
Import vests testsuite
Diffstat (limited to 'testsuite/vests/vhdl-93/ashenden/compliant/ch_06_tofp-b.vhd')
-rw-r--r-- | testsuite/vests/vhdl-93/ashenden/compliant/ch_06_tofp-b.vhd | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_06_tofp-b.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_06_tofp-b.vhd new file mode 100644 index 000000000..b5164765e --- /dev/null +++ b/testsuite/vests/vhdl-93/ashenden/compliant/ch_06_tofp-b.vhd @@ -0,0 +1,54 @@ + +-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc + +-- This file is part of VESTs (Vhdl tESTs). + +-- VESTs is free software; you can redistribute it and/or modify it +-- under the terms of the GNU General Public License as published by the +-- Free Software Foundation; either version 2 of the License, or (at +-- your option) any later version. + +-- VESTs is distributed in the hope that it will be useful, but WITHOUT +-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +-- for more details. + +-- You should have received a copy of the GNU General Public License +-- along with VESTs; if not, write to the Free Software Foundation, +-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +-- --------------------------------------------------------------------- +-- +-- $Id: ch_06_tofp-b.vhd,v 1.2 2001-10-26 16:29:34 paw Exp $ +-- $Revision: 1.2 $ +-- +-- --------------------------------------------------------------------- + +architecture behavioral of to_fp is + +begin + + behavior : process (vec) is + + variable temp : bit_vector(vec'range); + variable negative : boolean; + variable int_result : integer; + + begin + temp := to_bitvector(vec); + negative := temp(temp'left) = '1'; + if negative then + temp := not temp; + end if; + int_result := 0; + for index in vec'range loop -- sign bit of temp = '0' + int_result := int_result * 2 + bit'pos(temp(index)); + end loop; + if negative then + int_result := (-int_result) - 1; + end if; + -- convert to floating point and scale to [-1, +1) + r <= real(int_result) / real(2**15); + end process behavior; + +end architecture behavioral; |