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fdivsqrt post processing cleanup

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This commit is contained in:
David Harris 2022-12-31 05:45:15 -08:00
parent 99b244c8c4
commit 3ac62c74c2
1 changed files with 13 additions and 11 deletions
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22
pipelined/src/fpu/fdivsqrt/fdivsqrtpostproc.sv
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@ -112,15 +112,8 @@ module fdivsqrtpostproc(
mux2 #(`DIVb+4) normremsmux(NormRemDM, -NormRemDM, AsM, NormRemM); mux2 #(`DIVb+4) normremsmux(NormRemDM, -NormRemDM, AsM, NormRemM);
mux2 #(`DIVb+4) quotresmux(UnsignedQuotM, -UnsignedQuotM, NegQuotM, NormQuotM); mux2 #(`DIVb+4) quotresmux(UnsignedQuotM, -UnsignedQuotM, NegQuotM, NormQuotM);
// special case logic // Select quotient or remainder and do normalization shift
always_comb always_comb begin
if (BZeroM) begin // Divide by zero
if (RemOpM) SpecialFPIntDivResultM = AM;
else SpecialFPIntDivResultM = {(`XLEN){1'b1}};
end else if (ALTBM) begin // Numerator is zero
if (RemOpM) SpecialFPIntDivResultM = AM;
else SpecialFPIntDivResultM = '0;
end else begin
if (RemOpM) begin if (RemOpM) begin
NormShiftM = ALTBM ? 0 : (mM + (`DIVBLEN+1)'(`DIVa)); // no postshift if forwarding input A to remainder NormShiftM = ALTBM ? 0 : (mM + (`DIVBLEN+1)'(`DIVa)); // no postshift if forwarding input A to remainder
PreResultM = NormRemM; PreResultM = NormRemM;
@ -129,9 +122,18 @@ module fdivsqrtpostproc(
PreResultM = NormQuotM; PreResultM = NormQuotM;
end end
PreFPIntDivResultM = $signed(PreResultM >>> NormShiftM); PreFPIntDivResultM = $signed(PreResultM >>> NormShiftM);
SpecialFPIntDivResultM = PreFPIntDivResultM[`XLEN-1:0];
end end
// special case logic
always_comb
if (BZeroM) begin // Divide by zero
if (RemOpM) SpecialFPIntDivResultM = AM;
else SpecialFPIntDivResultM = {(`XLEN){1'b1}};
end else if (ALTBM) begin // Numerator is zero
if (RemOpM) SpecialFPIntDivResultM = AM;
else SpecialFPIntDivResultM = '0;
end else SpecialFPIntDivResultM = PreFPIntDivResultM[`XLEN-1:0];
// sign extend result for W64 // sign extend result for W64
if (`XLEN==64) begin if (`XLEN==64) begin
mux2 #(64) resmux(SpecialFPIntDivResultM[`XLEN-1:0], mux2 #(64) resmux(SpecialFPIntDivResultM[`XLEN-1:0],