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fdivsqrt post processing major simplification

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This commit is contained in:
David Harris 2022-12-31 05:42:51 -08:00
parent f587933fb5
commit 99b244c8c4
1 changed files with 4 additions and 8 deletions
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12
pipelined/src/fpu/fdivsqrt/fdivsqrtpostproc.sv
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@ -101,15 +101,16 @@ module fdivsqrtpostproc(
if (`IDIV_ON_FPU) begin // Int supported
logic [`DIVBLEN:0] NormShiftM;
logic [`DIVb+3:0] IntQuotM, NormRemM, NormRemDM, NormQuotM;
logic [`DIVb+3:0] UnsignedQuotM, NormRemM, NormRemDM, NormQuotM;
assign W = $signed(Sum) >>> `LOGR;
assign DM = {4'b0001, D};
assign UnsignedQuotM = {3'b000, PreQmM};
// Integer remainder: sticky and sign correction muxes
mux2 #(`DIVb+4) normremdmux(W, W+DM, NegStickyM, NormRemDM);
mux2 #(`DIVb+4) normremsmux(NormRemDM, -NormRemDM, AsM, NormRemM);
mux2 #(`DIVb+4) quotresmux({3'b000, PreQmM}, {3'b111, -PreQmM}, NegQuotM, NormQuotM);
mux2 #(`DIVb+4) quotresmux(UnsignedQuotM, -UnsignedQuotM, NegQuotM, NormQuotM);
// special case logic
always_comb
@ -120,17 +121,12 @@ module fdivsqrtpostproc(
if (RemOpM) SpecialFPIntDivResultM = AM;
else SpecialFPIntDivResultM = '0;
end else begin
logic [`DIVb+3:0] PreIntQuotM;
PreIntQuotM = {3'b000, PreQmM};
// flip sign if necessary
if (NegQuotM) IntQuotM = -PreIntQuotM;
else IntQuotM = PreIntQuotM;
if (RemOpM) begin
NormShiftM = ALTBM ? 0 : (mM + (`DIVBLEN+1)'(`DIVa)); // no postshift if forwarding input A to remainder
PreResultM = NormRemM;
end else begin
NormShiftM = ((`DIVBLEN+1)'(`DIVb) - (nM * (`DIVBLEN+1)'(`LOGR)));
PreResultM = IntQuotM;
PreResultM = NormQuotM;
end
PreFPIntDivResultM = $signed(PreResultM >>> NormShiftM);
SpecialFPIntDivResultM = PreFPIntDivResultM[`XLEN-1:0];