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53 lines
2.3 KiB
Systemverilog
53 lines
2.3 KiB
Systemverilog
///////////////////////////////////////////
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//
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// Written: me@KatherineParry.com
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// Modified: 7/5/2022
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//
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// Purpose: Negate integer result
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
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//
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// MIT LICENSE
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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// OR OTHER DEALINGS IN THE SOFTWARE.
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////////////////////////////////////////////////////////////////////////////////////////////////
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`include "wally-config.vh"
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module negateintres(
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input logic Xs,
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input logic [`NORMSHIFTSZ-1:0] Shifted,
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input logic Signed,
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input logic Int64,
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input logic Plus1,
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output logic [1:0] CvtNegResMsbs,
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output logic [`XLEN+1:0] CvtNegRes
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);
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// round and negate the positive res if needed
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assign CvtNegRes = Xs ? -({2'b0, Shifted[`NORMSHIFTSZ-1:`NORMSHIFTSZ-`XLEN]}+{{`XLEN+1{1'b0}}, Plus1}) : {2'b0, Shifted[`NORMSHIFTSZ-1:`NORMSHIFTSZ-`XLEN]}+{{`XLEN+1{1'b0}}, Plus1};
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always_comb
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if(Signed)
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if(Int64) CvtNegResMsbs = CvtNegRes[`XLEN:`XLEN-1];
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else CvtNegResMsbs = CvtNegRes[32:31];
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else
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if(Int64) CvtNegResMsbs = CvtNegRes[`XLEN+1:`XLEN];
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else CvtNegResMsbs = CvtNegRes[33:32];
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endmodule |