SVIncCompil/Testcases/UtdSV/sparc_exu_aluzcmp64.v

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// 
// OpenSPARC T1 Processor File: sparc_exu_aluzcmp64.v
// Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.
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////////////////////////////////////////////////////////////////////////
/*
//
//  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