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remove redundant logic

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This commit is contained in:
Kevin Kim 2023-10-26 11:11:33 -07:00
parent 7fdb419688
commit 815af68298
1 changed files with 3 additions and 2 deletions
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src/fpu/divremsqrt/divremsqrtshiftcorrection.sv
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@ -58,7 +58,7 @@ module divremsqrtshiftcorrection import cvw::*; #(parameter cvw_t P) (
// correct the shifting error caused by the LZA // correct the shifting error caused by the LZA
// - the only possible mantissa for a plus two is all zeroes // - 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); //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 // 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)
@ -70,7 +70,8 @@ module divremsqrtshiftcorrection import cvw::*; #(parameter cvw_t P) (
// if the result of the divider was calculated to be subnormal, then the result was correctly normalized, so select the top shifted bits // if the result of the divider was calculated to be subnormal, then the result was correctly normalized, so select the top shifted bits
always_comb always_comb
//if(FmaOp) Mf = {CorrSumShifted, {P.CORRSHIFTSZ-(3*P.NF+4){1'b0}}}; //if(FmaOp) Mf = {CorrSumShifted, {P.CORRSHIFTSZ-(3*P.NF+4){1'b0}}};
if (DivOp&~DivResSubnorm) Mf = CorrQmShifted; //if (DivOp&~DivResSubnorm) Mf = CorrQmShifted;
if (~DivResSubnorm) Mf = CorrQmShifted;
else Mf = Shifted[P.NORMSHIFTSZ-1:P.NORMSHIFTSZ-P.CORRSHIFTSZ]; else Mf = Shifted[P.NORMSHIFTSZ-1:P.NORMSHIFTSZ-P.CORRSHIFTSZ];
// Determine sum's exponent // Determine sum's exponent