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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-ams/ashenden/compliant/aliases/function_plus.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-ams/ashenden/compliant/aliases/function_plus.vhd')
-rw-r--r-- | testsuite/vests/vhdl-ams/ashenden/compliant/aliases/function_plus.vhd | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/aliases/function_plus.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/aliases/function_plus.vhd new file mode 100644 index 000000000..ddf330d0f --- /dev/null +++ b/testsuite/vests/vhdl-ams/ashenden/compliant/aliases/function_plus.vhd @@ -0,0 +1,59 @@ + +-- Copyright (C) 2002 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 + +package function_plus is + + -- code from book (in text) + + function "+" ( bv1, bv2 : bit_vector ) return bit_vector; + + -- end code from book + +end package function_plus; + + + +package body function_plus is + + -- code from book + + function "+" ( bv1, bv2 : bit_vector ) return bit_vector is + + alias norm1 : bit_vector(1 to bv1'length) is bv1; + alias norm2 : bit_vector(1 to bv2'length) is bv2; + + variable result : bit_vector(1 to bv1'length); + variable carry : bit := '0'; + + begin + if bv1'length /= bv2'length then + report "arguments of different length" severity failure; + else + for index in norm1'reverse_range loop + result(index) := norm1(index) xor norm2(index) xor carry; + carry := ( norm1(index) and norm2(index) ) + or ( carry and ( norm1(index) or norm2(index) ) ); + end loop; + end if; + return result; + end function "+"; + + -- end code from book + +end package body function_plus; |