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// ============================================================================
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// ============================================================================
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// __
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// __
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// \\__/ o\ (C) 2017-2018 Robert Finch, Waterloo
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// \\__/ o\ (C) 2017-2019 Robert Finch, Waterloo
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// \ __ / All rights reserved.
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// \ __ / All rights reserved.
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// \/_// robfinch<remove>@finitron.ca
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// \/_// robfinch<remove>@finitron.ca
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// ||
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// ||
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//
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//
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// FT64_EvalBranch.v
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// FT64_EvalBranch.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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`define TRUE 1'b1
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`define TRUE 1'b1
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`define BNEI 6'h12
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`define BBc 6'h26
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`define BBc 6'h26
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`define Bcc 6'h30
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`define Bcc 6'h30
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`define BEQI 6'h32
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`define BEQI 6'h32
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`define BCHK 6'h33
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`define BCHK 6'h33
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`define CHK 6'h34
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`define CHK 6'h34
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`define BNE 3'h1
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`define BNE 3'h1
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`define BLT 3'h2
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`define BLT 3'h2
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`define BGE 3'h3
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`define BGE 3'h3
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`define BLTU 3'h6
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`define BLTU 3'h6
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`define BGEU 3'h7
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`define BGEU 3'h7
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`define BAND 3'h0
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`define BOR 3'h1
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`define BXOR 3'd2
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`define BNAND 3'h4
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`define BNOR 3'h5
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`define BXNOR 3'd6
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`define IBNE 2'd2
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`define IBNE 2'd2
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`define DBNZ 2'd3
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`define DBNZ 2'd3
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module FT64_EvalBranch(instr, a, b, c, takb);
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module FT64_EvalBranch(instr, a, b, c, takb);
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`BGE: takb <= $signed(a) >= $signed(b);
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`BGE: takb <= $signed(a) >= $signed(b);
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`BLTU: takb <= a < b;
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`BLTU: takb <= a < b;
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`BGEU: takb <= a >= b;
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`BGEU: takb <= a >= b;
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default: takb <= `TRUE;
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default: takb <= `TRUE;
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endcase
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endcase
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`BLcc:
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case(instr[15:13])
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`BAND: takb <= a != 0 && b != 0;
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`BOR: takb <= a != 0 || b != 0;
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`BXOR: takb <= (a != 0) ^ (b != 0);
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`BNAND: takb <= !(a != 0 && b != 0);
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`BNOR: takb <= !(a != 0 || b != 0);
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`BXNOR: takb <= !((a != 0) ^ (b != 0));
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default: takb <= `TRUE;
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endcase
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`BEQI: takb <= a=={{56{instr[22]}},instr[22:18],instr[15:13]};
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`BEQI: takb <= a=={{56{instr[22]}},instr[22:18],instr[15:13]};
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`BNEI: takb <= a!={{56{instr[22]}},instr[22:18],instr[15:13]};
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`BBc:
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`BBc:
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case(instr[14:13])
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case(instr[14:13])
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2'd0: takb <= a[{instr[22:18],instr[15]}]; // BBS
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2'd0: takb <= a[{instr[22:18],instr[15]}]; // BBS
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2'd1: takb <= ~a[{instr[22:18],instr[15]}]; // BBC
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2'd1: takb <= ~a[{instr[22:18],instr[15]}]; // BBC
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`IBNE: takb <= (a + 64'd1) !=b;
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`IBNE: takb <= (a + 64'd1) !=b;
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