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Fixed formatting

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Harshini Srinath 2023-07-30 18:30:23 -07:00 committed by GitHub
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commit 811e2fd94c
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1 changed files with 16 additions and 16 deletions
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src/fpu/postproc/shiftcorrection.sv
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@ -29,41 +29,41 @@
module shiftcorrection import cvw::*; #(parameter cvw_t P) (
input logic [P.NORMSHIFTSZ-1:0] Shifted, // the shifted sum before LZA correction
// divsqrt
input logic DivOp, // is it a divsqrt opperation
input logic DivResSubnorm, // is the divsqrt result subnormal
input logic DivOp, // is it a divsqrt opperation
input logic DivResSubnorm, // is the divsqrt result subnormal
input logic [P.NE+1:0] DivQe, // the divsqrt result's exponent
input logic DivSubnormShiftPos, // is the subnorm divider shift amount positive (ie not underflowed)
input logic DivSubnormShiftPos, // is the subnorm divider shift amount positive (ie not underflowed)
//fma
input logic FmaOp, // is it an fma opperation
input logic FmaOp, // is it an fma opperation
input logic [P.NE+1:0] NormSumExp, // exponent of the normalized sum not taking into account Subnormal or zero results
input logic FmaPreResultSubnorm, // is the result subnormal - calculated before LZA corection
input logic FmaSZero,
input logic FmaPreResultSubnorm, // is the result subnormal - calculated before LZA corection
input logic FmaSZero,
// output
output logic [P.NE+1:0] FmaMe, // exponent of the normalized sum
output logic [P.CORRSHIFTSZ-1:0] Mf, // the shifted sum before LZA correction
output logic [P.NE+1:0] Qe // corrected exponent for divider
);
logic [3*P.NF+3:0] CorrSumShifted; // the shifted sum after LZA correction
logic [P.CORRSHIFTSZ-1:0] CorrQm0, CorrQm1; // portions of Shifted to select for CorrQmShifted
logic [P.CORRSHIFTSZ-1:0] CorrQmShifted; // the shifted divsqrt result after one bit shift
logic ResSubnorm; // is the result Subnormal
logic LZAPlus1; // add one or two to the sum's exponent due to LZA correction
logic LeftShiftQm; // should the divsqrt result be shifted one to the left
logic [3*P.NF+3:0] CorrSumShifted; // the shifted sum after LZA correction
logic [P.CORRSHIFTSZ-1:0] CorrQm0, CorrQm1; // portions of Shifted to select for CorrQmShifted
logic [P.CORRSHIFTSZ-1:0] CorrQmShifted; // the shifted divsqrt result after one bit shift
logic ResSubnorm; // is the result Subnormal
logic LZAPlus1; // add one or two to the sum's exponent due to LZA correction
logic LeftShiftQm; // should the divsqrt result be shifted one to the left
// LZA correction
assign LZAPlus1 = Shifted[P.NORMSHIFTSZ-1];
// correct the shifting error caused by the LZA
// - the only possible mantissa for a plus two is all zeroes
// - a one has to propigate all the way through a sum. so we can leave the bottom statement alone
// - a one has to propigate all the way through a sum. so we can leave the bottom statement alone
mux2 #(P.NORMSHIFTSZ-2) lzacorrmux(Shifted[P.NORMSHIFTSZ-3:0], Shifted[P.NORMSHIFTSZ-2:1], LZAPlus1, CorrSumShifted);
// correct the shifting of the divsqrt caused by producing a result in (2, .5] range
// condition: if the msb is 1 or the exponent was one, but the shifted quotent was < 1 (Subnorm)
// condition: if the msb is 1 or the exponent was one, but the shifted quotent was < 1 (Subnorm)
assign LeftShiftQm = (LZAPlus1|(DivQe==1&~LZAPlus1));
assign CorrQm0 = Shifted[P.NORMSHIFTSZ-3:P.NORMSHIFTSZ-P.CORRSHIFTSZ-2];
assign CorrQm1 = Shifted[P.NORMSHIFTSZ-2:P.NORMSHIFTSZ-P.CORRSHIFTSZ-1];
assign CorrQm0 = Shifted[P.NORMSHIFTSZ-3:P.NORMSHIFTSZ-P.CORRSHIFTSZ-2];
assign CorrQm1 = Shifted[P.NORMSHIFTSZ-2:P.NORMSHIFTSZ-P.CORRSHIFTSZ-1];
mux2 #(P.CORRSHIFTSZ) divcorrmux(CorrQm0, CorrQm1, LeftShiftQm, CorrQmShifted);
// if the result of the divider was calculated to be subnormal, then the result was correctly normalized, so select the top shifted bits