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`include "Raptor64_opcodes.v"
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`include "Raptor64_opcodes.v"
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`timescale 1ns / 1ps
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`timescale 1ns / 1ps
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//=============================================================================
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//=============================================================================
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// __
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// __
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// \\__/ o\ (C) 2012 Robert Finch
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// \\__/ o\ (C) 2012,2013 Robert Finch
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// \ __ / All rights reserved.
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// \ __ / All rights reserved.
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// \/_// robfinch<remove>@opencores.org
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// \/_// robfinch<remove>@opencores.org
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// ||
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// ||
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//
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//
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// Raptor64_bitfield.v
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// Raptor64_bitfield.v
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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//
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//
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//=============================================================================
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//=============================================================================
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//
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//
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//`define I_BFEXTS 1
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//`define I_SEXT 1
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module Raptor64_bitfield(xIR, a, b, o, masko);
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module Raptor64_bitfield(xIR, a, b, o, masko);
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parameter DWIDTH=64;
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input [31:0] xIR;
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input [31:0] xIR;
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input [63:0] a;
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input [DWIDTH-1:0] a;
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input [63:0] b;
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input [DWIDTH-1:0] b;
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output [63:0] o;
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output [DWIDTH-1:0] o;
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reg [63:0] o;
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reg [DWIDTH-1:0] o;
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output [63:0] masko;
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output [DWIDTH-1:0] masko;
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reg [63:0] o1;
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reg [DWIDTH-1:0] o1;
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reg [63:0] o2;
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reg [DWIDTH-1:0] o2;
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wire [6:0] xOpcode = xIR[31:25];
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wire [6:0] xOpcode = xIR[31:25];
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wire [2:0] xFunc3 = xIR[2:0];
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wire [2:0] xFunc3 = xIR[2:0];
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// generate mask
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// generate mask
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reg [63:0] mask;
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reg [DWIDTH-1:0] mask;
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assign masko = mask;
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assign masko = mask;
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wire [5:0] mb = xIR[8:3];
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wire [5:0] mb = xIR[8:3];
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wire [5:0] me = xIR[14:9];
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wire [5:0] me = xIR[14:9];
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wire [5:0] ml = me-mb; // mask length-1
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integer nn,n;
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integer nn,n;
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always @(mb or me or nn)
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always @(mb or me or nn)
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for (nn = 0; nn < 64; nn = nn + 1)
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for (nn = 0; nn < DWIDTH; nn = nn + 1)
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mask[nn] <= (nn >= mb) ^ (nn <= me) ^ (me >= mb);
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mask[nn] <= (nn >= mb) ^ (nn <= me) ^ (me >= mb);
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always @(xOpcode,xFunc3,mask,b,a,mb)
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always @(xOpcode,xFunc3,mask,b,a,mb)
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case (xOpcode)
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case (xOpcode)
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`BITFIELD:
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`BITFIELD:
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case(xFunc3)
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case(xFunc3)
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`BFINS: begin
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`BFINS: begin
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o2 = a << mb;
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o2 = a << mb;
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for (n = 0; n < 64; n = n + 1) o[n] = mask[n] ? o2[n] : b[n];
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for (n = 0; n < DWIDTH; n = n + 1) o[n] = mask[n] ? o2[n] : b[n];
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end
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end
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`BFSET: begin for (n = 0; n < 64; n = n + 1) o[n] = mask[n] ? 1'b1 : a[n]; end
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`BFSET: begin for (n = 0; n < DWIDTH; n = n + 1) o[n] = mask[n] ? 1'b1 : a[n]; end
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`BFCLR: begin for (n = 0; n < 64; n = n + 1) o[n] = mask[n] ? 1'b0 : a[n]; end
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`BFCLR: begin for (n = 0; n < DWIDTH; n = n + 1) o[n] = mask[n] ? 1'b0 : a[n]; end
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`BFCHG: begin for (n = 0; n < 64; n = n + 1) o[n] = mask[n] ? ~a[n] : a[n]; end
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`BFCHG: begin for (n = 0; n < DWIDTH; n = n + 1) o[n] = mask[n] ? ~a[n] : a[n]; end
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`BFEXT: begin
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`BFEXTU: begin
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for (n = 0; n < 64; n = n + 1)
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for (n = 0; n < DWIDTH; n = n + 1)
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o1[n] = mask[n] ? a[n] : 1'b0;
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o1[n] = mask[n] ? a[n] : 1'b0;
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o = o1 >> mb;
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o = o1 >> mb;
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end
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end
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default: o = 64'd0;
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`ifdef I_BFEXTS
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`BFEXTS: begin
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for (n = 0; n < DWIDTH; n = n + 1)
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o1[n] = mask[n] ? a[n] : 1'b0;
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o2 = o1 >> mb;
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for (n = 0; n < DWIDTH; n = n + 1)
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o[n] = n > ml ? o2[ml] : o2[n];
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end
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`endif
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`ifdef I_SEXT
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`SEXT: begin for (n = 0; n < DWIDTH; n = n + 1) o[n] = mask[n] ? a[mb] : a[n]; end
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`endif
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default: o = {DWIDTH{1'b0}};
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endcase
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endcase
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default: o = 64'd0;
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default: o = {DWIDTH{1'b0}};
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endcase
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endcase
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endmodule
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endmodule
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