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robfinch |
// ============================================================================
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// __
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// \\__/ o\ (C) 2018 Robert Finch, Waterloo
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// \ __ / All rights reserved.
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// \/_// robfinch<remove>@finitron.ca
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// ||
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//
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// FT64_AMO_alu.v
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//
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// This source file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This source file is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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//
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// ALU for atomic memory operations (AMO)
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// AMO ops have their own limited ALU since they can't wait on the usual
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// ALU.
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// ============================================================================
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//
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`include "FT64_defines.vh"
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module FT64_AMO_alu(instr, a, b, res);
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input [31:0] instr;
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input [63:0] a;
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input [63:0] b;
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output reg [63:0] res;
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wire [4:0] op = instr[30:26];
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always @*
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case(instr[5:0])
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`AMO:
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case(op)
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`AMO_SWAP: res <= b;
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`AMO_ADD: case(instr[23:21])
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3'd0,3'd4:
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begin
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res[7:0] <= a[7:0] + b[7:0];
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res[15:8] <= a[15:8] + b[15:8];
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res[23:16] <= a[23:16] + b[23:16];
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res[31:24] <= a[31:24] + b[31:24];
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res[39:32] <= a[39:32] + b[39:32];
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res[47:40] <= a[47:40] + b[47:40];
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res[55:48] <= a[55:48] + b[55:48];
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res[63:56] <= a[63:56] + b[63:56];
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end
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3'd1,3'd5:
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begin
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res[15:0] <= a[15:0] + b[15:0];
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res[31:16] <= a[31:16] + b[31:16];
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res[47:32] <= a[47:32] + b[47:32];
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res[63:48] <= a[63:48] + b[63:48];
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end
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3'd2,3'd6:
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begin
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res[31:0] <= a[31:0] + b[31:0];
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res[63:32] <= a[63:32] + b[63:32];
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end
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3'd3,3'd7: res <= a + b;
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endcase
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`AMO_AND: res <= a & b;
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`AMO_OR: res <= a | b;
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`AMO_XOR: res <= a ^ b;
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`AMO_SHL:
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case(instr[23:21])
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3'd0,3'd4:
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begin
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res[7:0] <= a[7:0] << b[2:0];
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res[15:8] <= a[15:8] << b[2:0];
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res[23:16] <= a[23:16] << b[2:0];
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res[31:24] <= a[31:24] << b[2:0];
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res[39:32] <= a[39:32] << b[2:0];
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res[47:40] <= a[47:40] << b[2:0];
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res[55:48] <= a[55:48] << b[2:0];
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res[63:56] <= a[63:56] << b[2:0];
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end
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3'd1,3'd5:
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begin
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res[15:0] <= a[15:0] << b[3:0];
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res[31:16] <= a[31:16] << b[3:0];
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res[47:32] <= a[47:32] << b[3:0];
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res[63:48] <= a[63:48] << b[3:0];
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end
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3'd2,3'd6:
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begin
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res[31:0] <= a[31:0] << b[4:0];
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res[63:32] <= a[63:32] << b[4:0];
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end
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3'd3,3'd7: res <= a << b[5:0];
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endcase
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`AMO_SHR:
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case(instr[23:21])
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3'd0,3'd4:
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begin
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res[7:0] <= a[7:0] >> b[2:0];
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res[15:8] <= a[15:8] >> b[2:0];
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res[23:16] <= a[23:16] >> b[2:0];
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res[31:24] <= a[31:24] >> b[2:0];
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res[39:32] <= a[39:32] >> b[2:0];
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res[47:40] <= a[47:40] >> b[2:0];
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res[55:48] <= a[55:48] >> b[2:0];
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res[63:56] <= a[63:56] >> b[2:0];
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end
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3'd1,3'd5:
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begin
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res[15:0] <= a[15:0] >> b[3:0];
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res[31:16] <= a[31:16] >> b[3:0];
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res[47:32] <= a[47:32] >> b[3:0];
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res[63:48] <= a[63:48] >> b[3:0];
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end
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3'd2,3'd6:
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begin
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res[31:0] <= a[31:0] >> b[4:0];
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res[63:32] <= a[63:32] >> b[4:0];
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end
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3'd3,3'd7: res <= a >> b[5:0];
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endcase
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`AMO_MIN:
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case(instr[23:21])
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3'd0,3'd4:
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begin
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res[7:0] <= $signed(a[7:0]) < $signed(b[7:0]) ? a[7:0] : b[7:0];
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res[15:8] <= $signed(a[15:8]) < $signed(b[15:8]) ? a[15:8] : b[15:8];
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res[23:16] <= $signed(a[23:16]) < $signed(b[23:16]) ? a[23:16] : b[23:16];
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res[31:24] <= $signed(a[31:24]) < $signed(b[31:24]) ? a[31:24] : b[31:24];
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res[39:32] <= $signed(a[39:32]) < $signed(b[39:32]) ? a[39:32] : b[39:32];
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res[47:40] <= $signed(a[47:40]) < $signed(b[47:40]) ? a[47:40] : b[47:40];
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res[55:48] <= $signed(a[55:48]) < $signed(b[55:48]) ? a[55:48] : b[55:48];
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res[63:56] <= $signed(a[63:56]) < $signed(b[63:56]) ? a[63:56] : b[63:56];
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end
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3'd1,3'd5:
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begin
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res[15:0] <= $signed(a[15:0]) < $signed(b[15:0]) ? a[15:0] : b[15:0];
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res[31:16] <= $signed(a[31:16]) < $signed(b[31:16]) ? a[31:16] : b[31:16];
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res[47:32] <= $signed(a[47:32]) < $signed(b[47:32]) ? a[47:32] : b[47:32];
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res[63:48] <= $signed(a[63:48]) < $signed(b[63:48]) ? a[63:48] : b[63:48];
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end
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3'd2,3'd6:
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begin
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res[31:0] <= $signed(a[31:0]) < $signed(b[31:0]) ? a[31:0] : b[31:0];
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res[63:32] <= $signed(a[63:32]) < $signed(b[63:32]) ? a[63:32] : b[63:32];
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end
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3'd3,3'd7: res <= $signed(a) < $signed(b) ? a : b;
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endcase
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`AMO_MAX:
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case(instr[23:21])
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3'd0,3'd4:
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begin
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res[7:0] <= $signed(a[7:0]) > $signed(b[7:0]) ? a[7:0] : b[7:0];
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res[15:8] <= $signed(a[15:8]) > $signed(b[15:8]) ? a[15:8] : b[15:8];
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res[23:16] <= $signed(a[23:16]) > $signed(b[23:16]) ? a[23:16] : b[23:16];
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res[31:24] <= $signed(a[31:24]) > $signed(b[31:24]) ? a[31:24] : b[31:24];
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res[39:32] <= $signed(a[39:32]) > $signed(b[39:32]) ? a[39:32] : b[39:32];
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res[47:40] <= $signed(a[47:40]) > $signed(b[47:40]) ? a[47:40] : b[47:40];
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res[55:48] <= $signed(a[55:48]) > $signed(b[55:48]) ? a[55:48] : b[55:48];
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res[63:56] <= $signed(a[63:56]) > $signed(b[63:56]) ? a[63:56] : b[63:56];
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end
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3'd1,3'd5:
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begin
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res[15:0] <= $signed(a[15:0]) > $signed(b[15:0]) ? a[15:0] : b[15:0];
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res[31:16] <= $signed(a[31:16]) > $signed(b[31:16]) ? a[31:16] : b[31:16];
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res[47:32] <= $signed(a[47:32]) > $signed(b[47:32]) ? a[47:32] : b[47:32];
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res[63:48] <= $signed(a[63:48]) > $signed(b[63:48]) ? a[63:48] : b[63:48];
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end
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3'd2,3'd6:
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begin
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res[31:0] <= $signed(a[31:0]) > $signed(b[31:0]) ? a[31:0] : b[31:0];
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res[63:32] <= $signed(a[63:32]) > $signed(b[63:32]) ? a[63:32] : b[63:32];
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end
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3'd3,3'd7: res <= $signed(a) > $signed(b) ? a : b;
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endcase
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`AMO_MINU:
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case(instr[23:21])
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3'd0,3'd4:
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begin
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res[7:0] <= $unsigned(a[7:0]) < $unsigned(b[7:0]) ? a[7:0] : b[7:0];
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res[15:8] <= $unsigned(a[15:8]) < $unsigned(b[15:8]) ? a[15:8] : b[15:8];
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res[23:16] <= $unsigned(a[23:16]) < $unsigned(b[23:16]) ? a[23:16] : b[23:16];
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res[31:24] <= $unsigned(a[31:24]) < $unsigned(b[31:24]) ? a[31:24] : b[31:24];
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res[39:32] <= $unsigned(a[39:32]) < $unsigned(b[39:32]) ? a[39:32] : b[39:32];
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res[47:40] <= $unsigned(a[47:40]) < $unsigned(b[47:40]) ? a[47:40] : b[47:40];
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res[55:48] <= $unsigned(a[55:48]) < $unsigned(b[55:48]) ? a[55:48] : b[55:48];
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res[63:56] <= $unsigned(a[63:56]) < $unsigned(b[63:56]) ? a[63:56] : b[63:56];
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end
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3'd1,3'd5:
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begin
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res[15:0] <= $unsigned(a[15:0]) < $unsigned(b[15:0]) ? a[15:0] : b[15:0];
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res[31:16] <= $unsigned(a[31:16]) < $unsigned(b[31:16]) ? a[31:16] : b[31:16];
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res[47:32] <= $unsigned(a[47:32]) < $unsigned(b[47:32]) ? a[47:32] : b[47:32];
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res[63:48] <= $unsigned(a[63:48]) < $unsigned(b[63:48]) ? a[63:48] : b[63:48];
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end
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3'd2,3'd6:
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begin
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res[31:0] <= $unsigned(a[31:0]) < $unsigned(b[31:0]) ? a[31:0] : b[31:0];
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res[63:32] <= $unsigned(a[63:32]) < $unsigned(b[63:32]) ? a[63:32] : b[63:32];
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end
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3'd3,3'd7: res <= $unsigned(a) < $unsigned(b) ? a : b;
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endcase
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`AMO_MAXU:
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case(instr[23:21])
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3'd0,3'd4:
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begin
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res[7:0] <= $unsigned(a[7:0]) > $unsigned(b[7:0]) ? a[7:0] : b[7:0];
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res[15:8] <= $unsigned(a[15:8]) > $unsigned(b[15:8]) ? a[15:8] : b[15:8];
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res[23:16] <= $unsigned(a[23:16]) > $unsigned(b[23:16]) ? a[23:16] : b[23:16];
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res[31:24] <= $unsigned(a[31:24]) > $unsigned(b[31:24]) ? a[31:24] : b[31:24];
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res[39:32] <= $unsigned(a[39:32]) > $unsigned(b[39:32]) ? a[39:32] : b[39:32];
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res[47:40] <= $unsigned(a[47:40]) > $unsigned(b[47:40]) ? a[47:40] : b[47:40];
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res[55:48] <= $unsigned(a[55:48]) > $unsigned(b[55:48]) ? a[55:48] : b[55:48];
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res[63:56] <= $unsigned(a[63:56]) > $unsigned(b[63:56]) ? a[63:56] : b[63:56];
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end
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3'd1,3'd5:
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begin
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res[15:0] <= $unsigned(a[15:0]) > $unsigned(b[15:0]) ? a[15:0] : b[15:0];
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res[31:16] <= $unsigned(a[31:16]) > $unsigned(b[31:16]) ? a[31:16] : b[31:16];
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res[47:32] <= $unsigned(a[47:32]) > $unsigned(b[47:32]) ? a[47:32] : b[47:32];
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res[63:48] <= $unsigned(a[63:48]) > $unsigned(b[63:48]) ? a[63:48] : b[63:48];
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end
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3'd2,3'd6:
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begin
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res[31:0] <= $unsigned(a[31:0]) > $unsigned(b[31:0]) ? a[31:0] : b[31:0];
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res[63:32] <= $unsigned(a[63:32]) > $unsigned(b[63:32]) ? a[63:32] : b[63:32];
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end
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3'd3,3'd7: res <= $unsigned(a) > $unsigned(b) ? a : b;
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endcase
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default: res <= 64'hDEADDEADDEADDEAD;
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endcase
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`INC: res <= a + b;
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default: res <= 64'hDEADDEADDEADDEAD;
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endcase
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endmodule
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