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LZA refactoring switched to Pp1, Gm1, Km1

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David Harris 2022-08-01 12:20:23 -07:00
parent 5012b96120
commit 87e6402af6
1 changed files with 5 additions and 5 deletions
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10
pipelined/src/fpu/fmalza.sv
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@ -42,11 +42,11 @@ module fmalza( // [Schmookler & Nowka, Leading zero anticipation and detection,
logic [WIDTH-2:0] Pp1, Gm1, Km1;
assign B = {{(`NF+3){1'b0}}, Pm}; // Zero extend product
assign AA = A + Cin;
// assign AA = A + Cin;
assign P = AA^B;
assign G = AA&B;
assign K= ~AA&~B;
assign P = A^B;
assign G = A&B;
assign K= ~A&~B;
assign Pp1 = P[WIDTH-1:1];
assign Gm1 = {G[WIDTH-3:0], Cin};
@ -57,7 +57,7 @@ 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[3*`NF+5:0]&{~K[3*`NF+4:0], 1'b0} | K[3*`NF+5:0]&{~G[3*`NF+4:0], 1'b1})) | (~P[3*`NF+6:1]&(K[3*`NF+5:0]&{~K[3*`NF+4:0], 1'b0} | G[3*`NF+5:0]&{~G[3*`NF+4:0], 1'b1}));
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));
lzc #(WIDTH) lzc (.num(F), .ZeroCnt(SCnt));
endmodule