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cast: fix conversion to signed integer #97

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Aug 2, 2023
Merged

cast: fix conversion to signed integer #97

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6 changes: 5 additions & 1 deletion src/fpnew_cast_multi.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -443,7 +443,11 @@ module fpnew_cast_multi #(
// By default right shift mantissa to be an integer
denorm_shamt = unsigned'(MAX_INT_WIDTH - 1 - input_exp_q);
// overflow: when converting to unsigned the range is larger by one
if (input_exp_q >= signed'(fpnew_pkg::int_width(int_fmt_q2) - 1 + op_mod_q2)) begin
if ((input_exp_q >= signed'(fpnew_pkg::int_width(int_fmt_q2) - 1 + op_mod_q2)) // Exponent larger than max int range,
&& !(!op_mod_q2 // unless cast to signed int
&& input_sign_q // and input value is larges negative int value
&& (input_exp_q == signed'(fpnew_pkg::int_width(int_fmt_q2) - 1))
&& (input_mant_q == {1'b1, {INT_MAN_WIDTH-1{1'b0}}}))) begin
denorm_shamt = '0; // prevent shifting
of_before_round = 1'b1;
// underflow
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