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fdivsqrt post processing simplification

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This commit is contained in:
David Harris 2022-12-31 05:37:48 -08:00
parent 5edc925dff
commit f587933fb5
1 changed files with 3 additions and 9 deletions
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12
pipelined/src/fpu/fdivsqrt/fdivsqrtpostproc.sv
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@ -101,7 +101,7 @@ module fdivsqrtpostproc(
if (`IDIV_ON_FPU) begin // Int supported if (`IDIV_ON_FPU) begin // Int supported
logic [`DIVBLEN:0] NormShiftM; logic [`DIVBLEN:0] NormShiftM;
logic [`DIVb+3:0] IntQuotM, IntRemM, NormRemM, NormRemDM, NormQuotM; logic [`DIVb+3:0] IntQuotM, NormRemM, NormRemDM, NormQuotM;
assign W = $signed(Sum) >>> `LOGR; assign W = $signed(Sum) >>> `LOGR;
assign DM = {4'b0001, D}; assign DM = {4'b0001, D};
@ -121,19 +121,13 @@ module fdivsqrtpostproc(
else SpecialFPIntDivResultM = '0; else SpecialFPIntDivResultM = '0;
end else begin end else begin
logic [`DIVb+3:0] PreIntQuotM; logic [`DIVb+3:0] PreIntQuotM;
if (WZeroM) begin PreIntQuotM = {3'b000, PreQmM};
PreIntQuotM = weq0M ? {3'b000, FirstU} : {3'b000, FirstUM};
IntRemM = '0;
end else begin
PreIntQuotM = {3'b000, PreQmM};
IntRemM = NormRemM;
end
// flip sign if necessary // flip sign if necessary
if (NegQuotM) IntQuotM = -PreIntQuotM; if (NegQuotM) IntQuotM = -PreIntQuotM;
else IntQuotM = PreIntQuotM; else IntQuotM = PreIntQuotM;
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 = IntRemM; PreResultM = NormRemM;
end else begin end else begin
NormShiftM = ((`DIVBLEN+1)'(`DIVb) - (nM * (`DIVBLEN+1)'(`LOGR))); NormShiftM = ((`DIVBLEN+1)'(`DIVb) - (nM * (`DIVBLEN+1)'(`LOGR)));
PreResultM = IntQuotM; PreResultM = IntQuotM;