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Fixed issue #57 of sign selection for improperly NaN-boxed number

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David Harris 2023-02-18 05:34:40 -08:00
parent 5986931fdc
commit 66e5c60fb4
1 changed files with 6 additions and 2 deletions
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8
src/fpu/unpackinput.sv
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@ -85,7 +85,7 @@ module unpackinput (
PostBox = In;
// choose sign bit depending on format - 1=larger precsion 0=smaller precision
assign Sgn = Fmt ? In[`FLEN-1] : In[`LEN1-1];
assign Sgn = Fmt ? In[`FLEN-1] : (BadNaNBox ? 0 : In[`LEN1-1]); // improperly boxed NaNs are treated as positive
// extract the fraction, add trailing zeroes to the mantissa if nessisary
assign Frac = Fmt ? In[`NF-1:0] : {In[`NF1-1:0], (`NF-`NF1)'(0)};
@ -151,6 +151,8 @@ module unpackinput (
// extract the sign bit
always_comb
if (BadNaNBox) Sgn = 0; // improperly boxed NaNs are treated as positive
else
case (Fmt)
`FMT: Sgn = In[`FLEN-1];
`FMT1: Sgn = In[`LEN1-1];
@ -158,7 +160,7 @@ module unpackinput (
default: Sgn = 1'bx;
endcase
// extract the fraction
// extract the fraction
always_comb
case (Fmt)
`FMT: Frac = In[`NF-1:0];
@ -237,6 +239,8 @@ module unpackinput (
// extract sign bit
always_comb
if (BadNaNBox) Sgn = 0; // improperly boxed NaNs are treated as positive
else
case (Fmt)
2'b11: Sgn = In[`Q_LEN-1];
2'b01: Sgn = In[`D_LEN-1];