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more lza cleanup

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This commit is contained in:
David Harris 2022-08-01 12:34:00 -07:00
parent 48500c642c
commit 31215277ee
1 changed files with 7 additions and 5 deletions
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pipelined/src/fpu/fmalza.sv
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@ -39,15 +39,17 @@ module fmalza( // [Schmookler & Nowka, Leading zero anticipation and detection,
localparam WIDTH = 3*`NF+7;
logic [WIDTH-1:0] B,F;
logic [WIDTH-1:0] P, G, K;
logic [WIDTH-1:0] P, G;
logic [WIDTH-2:0] K;
logic [WIDTH-2:0] Pp1, Gm1, Km1;
assign B = {{(`NF+3){1'b0}}, Pm}; // Zero extend product
// assign AA = A + Cin;
// next steps***replace P[WIDTH-1] with sub, then remove one bit from A
assign P = A^B;
assign G = A&B;
assign K= ~A&~B;
assign G = A[WIDTH-2:0]&B[WIDTH-2:0];
assign K= ~A[WIDTH-2:0]&~B[WIDTH-2:0];
assign Pp1 = {A[WIDTH-1], P[WIDTH-2:1]};
assign Gm1 = {G[WIDTH-3:0], Cin};
@ -58,7 +60,7 @@ module fmalza( // [Schmookler & Nowka, Leading zero anticipation and detection,
//f[n] = ~P[n]&P[n-1] note: n is the MSB
//f[i] = (P[i+1]&(G[i]&~K[i-1] | K[i]&~G[i-1])) | (~P[i+1]&(K[i]&~K[i-1] | G[i]&~G[i-1]))
assign F[WIDTH-1] = ~P[WIDTH-1]&P[WIDTH-2];
assign F[WIDTH-2:0] = (Pp1&(G[WIDTH-2:0]&~Km1 | K[WIDTH-2:0]&~Gm1)) | (~Pp1&(K[WIDTH-2:0]&~Km1 | G[WIDTH-2:0]&~Gm1));
assign F[WIDTH-2:0] = (Pp1&(G&~Km1 | K&~Gm1)) | (~Pp1&(K&~Km1 | G&~Gm1));
lzc #(WIDTH) lzc (.num(F), .ZeroCnt(SCnt));
endmodule