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Small bug fixes in $not, $neg, and $shiftx models

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This commit is contained in:
Clifford Wolf 2014-09-02 17:48:41 +02:00
parent acd7a99aef
commit c38283dbd0
3 changed files with 8 additions and 9 deletions
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5
kernel/calc.cc
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@ -591,10 +591,9 @@ RTLIL::Const RTLIL::const_bu0(const RTLIL::Const &arg1, const RTLIL::Const&, boo
RTLIL::Const RTLIL::const_neg(const RTLIL::Const &arg1, const RTLIL::Const&, bool signed1, bool, int result_len)
{
RTLIL::Const arg1_ext = arg1;
extend(arg1_ext, result_len, signed1);
RTLIL::Const zero(RTLIL::State::S0, 1);
return RTLIL::const_sub(zero, arg1_ext, false, signed1, result_len);
return RTLIL::const_sub(zero, arg1_ext, true, signed1, result_len);
}
YOSYS_NAMESPACE_END

7
kernel/satgen.h
View file

@ -357,7 +357,7 @@ struct SatGen
if (model_undef) {
std::vector<int> undef_a = importUndefSigSpec(cell->getPort("\\A"), timestep);
std::vector<int> undef_y = importUndefSigSpec(cell->getPort("\\Y"), timestep);
extendSignalWidthUnary(undef_a, undef_y, cell, true);
extendSignalWidthUnary(undef_a, undef_y, cell, false);
ez->assume(ez->vec_eq(undef_a, undef_y));
undefGating(y, yy, undef_y);
}
@ -671,7 +671,7 @@ struct SatGen
int extend_bit = ez->FALSE;
if (cell->type != "$shift" && cell->type != "$shiftx" && cell->parameters["\\A_SIGNED"].as_bool())
if (!cell->type.in("$shift", "$shiftx") && cell->parameters["\\A_SIGNED"].as_bool())
extend_bit = a.back();
while (y.size() < a.size())
@ -703,7 +703,8 @@ struct SatGen
std::vector<int> undef_y = importUndefSigSpec(cell->getPort("\\Y"), timestep);
std::vector<int> undef_a_shifted;
if (cell->type != "$shift" && cell->type != "$shiftx" && cell->parameters["\\A_SIGNED"].as_bool())
extend_bit = cell->type == "$shiftx" ? ez->TRUE : ez->FALSE;
if (!cell->type.in("$shift", "$shiftx") && cell->parameters["\\A_SIGNED"].as_bool())
extend_bit = undef_a.back();
while (undef_y.size() < undef_a.size())

5
techlibs/common/simlib.v
View file

@ -108,13 +108,12 @@ parameter Y_WIDTH = 0;
input [A_WIDTH-1:0] A;
output [Y_WIDTH-1:0] Y;
wire [Y_WIDTH-1:0] tmp;
generate
if (A_SIGNED) begin:BLOCK1
assign tmp = $signed(A), Y = -tmp;
assign Y = -$signed(A);
end else begin:BLOCK2
assign tmp = A, Y = -tmp;
assign Y = -A;
end
endgenerate