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Merge pull request #2333 from YosysHQ/mwk/peepopt-shiftmul-signed

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peeopt.shiftmul: Add a signedness check.
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clairexen 2020-08-20 16:23:07 +02:00 • committed by GitHub
commit 799076af24
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2 changed files with 12 additions and 5 deletions
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6
passes/pmgen/peepopt_shiftmul.pmg
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@ -31,22 +31,18 @@ match mul
select mul->type.in($mul)
select port(mul, \A).is_fully_const() || port(mul, \B).is_fully_const()
index <SigSpec> port(mul, \Y) === shamt
filter !param(mul, \A_SIGNED).as_bool()
endmatch
code
{
IdString const_factor_port = port(mul, \A).is_fully_const() ? \A : \B;
IdString const_factor_signed = const_factor_port == \A ? \A_SIGNED : \B_SIGNED;
Const const_factor_cnst = port(mul, const_factor_port).as_const();
int const_factor = const_factor_cnst.as_int();
if (GetSize(const_factor_cnst) == 0)
reject;
if (const_factor_cnst.bits[GetSize(const_factor_cnst)-1] != State::S0 &&
param(mul, const_factor_signed).as_bool())
reject;
if (GetSize(const_factor_cnst) > 20)
reject;