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Diffstat (limited to 'testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_lt.vhd')
-rw-r--r-- | testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_lt.vhd | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_lt.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_lt.vhd new file mode 100644 index 000000000..bbcf2835a --- /dev/null +++ b/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_lt.vhd @@ -0,0 +1,75 @@ + +-- 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 + +entity bv_lt is +end entity bv_lt; + + + +architecture test of bv_lt is + + -- code from book + + procedure bv_lt ( bv1, bv2 : in bit_vector; result : out boolean ) is + variable tmp1 : bit_vector(bv1'range) := bv1; + variable tmp2 : bit_vector(bv2'range) := bv2; + begin + tmp1(tmp1'left) := not tmp1(tmp1'left); + tmp2(tmp2'left) := not tmp2(tmp2'left); + result := tmp1 < tmp2; + end procedure bv_lt; + + -- end code from book + +begin + + stimulus : process is + + subtype byte is bit_vector(0 to 7); + variable result : boolean; + + begin + bv_lt( byte'(X"02"), byte'(X"04"), result ); + assert result; + + bv_lt( byte'(X"02"), byte'(X"02"), result ); + assert not result; + + bv_lt( byte'(X"02"), byte'(X"02"), result ); + assert not result; + + bv_lt( byte'(X"FC"), byte'(X"04"), result ); + assert result; + + bv_lt( byte'(X"04"), byte'(X"FC"), result ); + assert not result; + + bv_lt( byte'(X"FC"), byte'(X"FC"), result ); + assert not result; + + bv_lt( byte'(X"FC"), byte'(X"FE"), result ); + assert result; + + bv_lt( byte'(X"FE"), byte'(X"FC"), result ); + assert not result; + + wait; + end process stimulus; + +end architecture test; |