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