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This commit is contained in:
Kevin Kim 2024-03-04 14:31:21 -08:00
parent 9b87a00698
commit 10ab07975f
1 changed files with 3 additions and 4 deletions
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src/fpu/fdivsqrt/fdivsqrtuslc4cmp.sv
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@ -31,7 +31,8 @@ module fdivsqrtuslc4cmp (
input logic [2:0] Dmsbs, // U0.3 fractional bits after implicit leading 1 input logic [2:0] Dmsbs, // U0.3 fractional bits after implicit leading 1
input logic [4:0] Smsbs, // U1.4 leading bits of square root approximation input logic [4:0] Smsbs, // U1.4 leading bits of square root approximation
input logic [7:0] WSmsbs, WCmsbs, // Q4.4 residual most significant bits input logic [7:0] WSmsbs, WCmsbs, // Q4.4 residual most significant bits
input logic SqrtE, j0, j1, input logic SqrtE,
input logic j0,j1, // are we on first (j0) or second step (j1) of digit selection
output logic [3:0] udigit // {2, 1, -1, -2} digit is 0 if none are hot output logic [3:0] udigit // {2, 1, -1, -2} digit is 0 if none are hot
); );
logic [6:0] Wmsbs; logic [6:0] Wmsbs;
@ -73,11 +74,9 @@ module fdivsqrtuslc4cmp (
assign mkj1 = j1 ? 8 : 0; // when j = 1 use mk1[101] = 8 and when j = 0 use 0 so we choose u_0 = 1 assign mkj1 = j1 ? 8 : 0; // when j = 1 use mk1[101] = 8 and when j = 0 use 0 so we choose u_0 = 1
assign sqrtspecial = SqrtE & (j1 | j0); assign sqrtspecial = SqrtE & (j1 | j0);
// Choose A for current operation *** Come back to this // Choose A for current operation
always_comb always_comb
if (SqrtE) begin if (SqrtE) begin
//if (j1) A = 3'b101;
//if (Smsbs == 5'b10000) A = 3'b111; // *** can we get rid of SMSBs case?
if (Smsbs[4]) A = 3'b111; // *** can we get rid of SMSBs case? if (Smsbs[4]) A = 3'b111; // *** can we get rid of SMSBs case?
else A = Smsbs[2:0]; else A = Smsbs[2:0];
end else A = Dmsbs; end else A = Dmsbs;