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cmp2lut techmap fix

This commit is contained in:
nick 2026-08-14 10:17:30 -06:00
parent b57ffad7d0
commit bd90d0e83a
1 changed files with 8 additions and 5 deletions
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13
techlibs/common/cmp2lut.v
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@ -32,6 +32,7 @@ parameter _TECHMAP_CONSTVAL_B_ = 0;
function automatic [(1 << `LUT_WIDTH)-1:0] gen_lut;
input integer width;
input integer cst_width;
input integer operation;
input integer swap;
input integer sign;
@ -40,11 +41,13 @@ function automatic [(1 << `LUT_WIDTH)-1:0] gen_lut;
begin
gen_lut = width'b0;
for (n = 0; n < (1 << width); n++) begin
if (sign)
if (sign) begin
i_var = n[width-1:0];
else
i_cst = operand[cst_width-1:0];
end else begin
i_var = n;
i_cst = operand;
i_cst = operand;
end
if (swap) begin
lhs = i_cst;
rhs = i_var;
@ -78,7 +81,7 @@ generate
else if (&_TECHMAP_CONSTMSK_B_)
\$lut #(
.WIDTH(A_WIDTH),
.LUT({ gen_lut(A_WIDTH, operation, 0, A_SIGNED && B_SIGNED, _TECHMAP_CONSTVAL_B_) })
.LUT({ gen_lut(A_WIDTH, B_WIDTH, operation, 0, A_SIGNED && B_SIGNED, _TECHMAP_CONSTVAL_B_) })
) _TECHMAP_REPLACE_ (
.A(A),
.Y(Y)
@ -86,7 +89,7 @@ generate
else if (&_TECHMAP_CONSTMSK_A_)
\$lut #(
.WIDTH(B_WIDTH),
.LUT({ gen_lut(B_WIDTH, operation, 1, A_SIGNED && B_SIGNED, _TECHMAP_CONSTVAL_A_) })
.LUT({ gen_lut(B_WIDTH, A_WIDTH, operation, 1, A_SIGNED && B_SIGNED, _TECHMAP_CONSTVAL_A_) })
) _TECHMAP_REPLACE_ (
.A(B),
.Y(Y)