Github_Repos/cvw
1
0
Fork 1
mirror of https://github.com/openhwgroup/cvw synced 2025-02-11 06:05:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

Removing two unnecessary 0's from fmashiftcalc interface

Browse Source
This commit is contained in:
David Harris 2024-06-10 07:38:03 -07:00
parent 1873064be5
commit 4c066c078f
2 changed files with 13 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/fpu/postproc/fmashiftcalc.sv
View File

@ -28,18 +28,17 @@
////////////////////////////////////////////////////////////////////////////////////////////////
module fmashiftcalc import cvw::*; #(parameter cvw_t P) (
input logic [P.FMTBITS-1:0] Fmt, // precision 1 = double 0 = single
input logic [P.NE+1:0] FmaSe, // sum's exponent
input logic [P.FMALEN-1:0] FmaSm, // the positive sum
input logic [P.FMTBITS-1:0] Fmt, // precision 1 = double 0 = single
input logic [P.NE+1:0] FmaSe, // sum's exponent
input logic [P.FMALEN-1:0] FmaSm, // the positive sum
input logic [$clog2(P.FMALEN+1)-1:0] FmaSCnt, // normalization shift count
output logic [P.NE+1:0] NormSumExp, // exponent of the normalized sum not taking into account Subnormal or zero results
output logic FmaSZero, // is the sum zero
output logic FmaPreResultSubnorm, // is the result subnormal - calculated before LZA corection
output logic [$clog2(P.FMALEN+1)-1:0] FmaShiftAmt, // normalization shift count
output logic [P.FMALEN+1:0] FmaShiftIn
output logic [P.NE+1:0] NormSumExp, // exponent of the normalized sum not taking into account Subnormal or zero results
output logic FmaSZero, // is the sum zero
output logic FmaPreResultSubnorm, // is the result subnormal - calculated before LZA corection
output logic [$clog2(P.FMALEN+1)-1:0] FmaShiftAmt // normalization shift count
);
logic [P.NE+1:0] PreNormSumExp; // the exponent of the normalized sum with the P.FLEN bias
logic [P.NE+1:0] BiasCorr; // correction for bias
logic [P.NE+1:0] PreNormSumExp; // the exponent of the normalized sum with the P.FLEN bias
logic [P.NE+1:0] BiasCorr; // correction for bias
///////////////////////////////////////////////////////////////////////////////
// Normalization
@ -130,7 +129,6 @@ module fmashiftcalc import cvw::*; #(parameter cvw_t P) (
// set and calculate the shift input and amount
// - shift once if killing a product and the result is subnormal
assign FmaShiftIn = {2'b0, FmaSm};
if (P.FPSIZES == 1) assign FmaShiftAmt = FmaPreResultSubnorm ? FmaSe[$clog2(P.FMALEN-1)-1:0]+($clog2(P.FMALEN-1))'(P.NF+3): FmaSCnt+1;
else assign FmaShiftAmt = FmaPreResultSubnorm ? FmaSe[$clog2(P.FMALEN-1)-1:0]+($clog2(P.FMALEN-1))'(P.NF+3)+BiasCorr[$clog2(P.FMALEN-1)-1:0]: FmaSCnt+1;
endmodule

9
src/fpu/postproc/postprocess.sv
View File

@ -44,7 +44,7 @@ module postprocess import cvw::*; #(parameter cvw_t P) (
input logic FmaPs, // the product's sign
input logic FmaSs, // Sum sign
input logic [P.NE+1:0] FmaSe, // the sum's exponent
input logic [P.FMALEN-1:0] FmaSm, // the positive sum
input logic [P.FMALEN-1:0] FmaSm, // the positive sum
input logic FmaASticky, // sticky bit that is calculated during alignment
input logic [$clog2(P.FMALEN+1)-1:0] FmaSCnt, // the normalization shift count
//divide signals
@ -86,7 +86,6 @@ module postprocess import cvw::*; #(parameter cvw_t P) (
// fma signals
logic [P.NE+1:0] FmaMe; // exponent of the normalized sum
logic FmaSZero; // is the sum zero
logic [P.FMALEN+1:0] FmaShiftIn; // fma shift input
logic [P.NE+1:0] NormSumExp; // exponent of the normalized sum not taking into account Subnormal or zero results
logic FmaPreResultSubnorm; // is the result subnormal - calculated before LZA corection
logic [$clog2(P.FMALEN+1)-1:0] FmaShiftAmt; // normalization shift amount for fma
@ -145,8 +144,8 @@ module postprocess import cvw::*; #(parameter cvw_t P) (
cvtshiftcalc #(P) cvtshiftcalc(.ToInt, .CvtCe, .CvtResSubnormUf, .Xm, .CvtLzcIn,
.XZero, .IntToFp, .OutFmt, .CvtResUf, .CvtShiftIn);
fmashiftcalc #(P) fmashiftcalc(.FmaSm, .FmaSCnt, .Fmt, .NormSumExp, .FmaSe,
.FmaSZero, .FmaPreResultSubnorm, .FmaShiftAmt, .FmaShiftIn);
fmashiftcalc #(P) fmashiftcalc(.FmaSCnt, .Fmt, .NormSumExp, .FmaSe, .FmaSm,
.FmaSZero, .FmaPreResultSubnorm, .FmaShiftAmt);
divshiftcalc #(P) divshiftcalc(.DivUe, .DivUm, .DivResSubnorm, .DivSubnormShiftPos, .DivShiftAmt, .DivShiftIn);
@ -155,7 +154,7 @@ module postprocess import cvw::*; #(parameter cvw_t P) (
case(PostProcSel)
2'b10: begin // fma
ShiftAmt = {{P.LOGNORMSHIFTSZ-$clog2(P.FMALEN-1){1'b0}}, FmaShiftAmt};
ShiftIn = {FmaShiftIn, {P.NORMSHIFTSZ-(P.FMALEN+2){1'b0}}};
ShiftIn = {{2'b00, FmaSm}, {P.NORMSHIFTSZ-(P.FMALEN+2){1'b0}}};
end
2'b00: begin // cvt
ShiftAmt = {{P.LOGNORMSHIFTSZ-$clog2(P.CVTLEN+1){1'b0}}, CvtShiftAmt};