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[/] [sparc64soc/] [trunk/] [T1-CPU/] [exu/] [sparc_exu_aluzcmp64.v] - Rev 2
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// ========== Copyright Header Begin ========================================== // // OpenSPARC T1 Processor File: sparc_exu_aluzcmp64.v // Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. // // The above named program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public // License version 2 as published by the Free Software Foundation. // // The above named program 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 this work; if not, write to the Free Software // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. // // ========== Copyright Header End ============================================ //////////////////////////////////////////////////////////////////////// /* // // Module Name: sparc_exu_aluzcmp64 // Description: This block determines if the input 'source' is zero. // It provides to outputs. zero64 is high if all 64 bits // are zero, while zero32 is high if the lower 32 bits are // zero. It uses 2 32 bit or gates and then NORs them. */ module sparc_exu_aluzcmp64 ( in, zero64, zero32 ); input [63:0] in; // input operand output zero64; // true if input is zero output zero32; // true if lower 32 bits are zero wire low_nonzero; // low 32 is nonzero wire high_nonzero; // high 32 is nonzero // evaluate each half of the input sparc_exu_aluor32 lowcmp(.in(in[31:0]), .out(low_nonzero)); sparc_exu_aluor32 highcmp(.in(in[63:32]), .out(high_nonzero)); assign zero32 = ~low_nonzero; assign zero64 = ~(low_nonzero | high_nonzero); endmodule // sparc_exu_aluzcmp64