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Merge pull request #4992 from Anhijkt/fix-ice40dsp-unsigned

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ice40_dsp: fix const handling
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KrystalDelusion 2025-04-26 11:15:02 +12:00 • committed by GitHub
commit 6564810ae3
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2 changed files with 91 additions and 3 deletions
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14
techlibs/ice40/ice40_dsp.pmg
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@ -23,7 +23,7 @@ match mul
endmatch
code sigA sigB sigH
auto unextend = [](const SigSpec &sig) {
auto unextend_signed = [](const SigSpec &sig) {
int i;
for (i = GetSize(sig)-1; i > 0; i--)
if (sig[i] != sig[i-1])
@ -32,8 +32,16 @@ code sigA sigB sigH
++i;
return sig.extract(0, i);
};
sigA = unextend(port(mul, \A));
sigB = unextend(port(mul, \B));
auto unextend_unsigned = [](const SigSpec &sig) {
int i;
for (i = GetSize(sig)-1; i > 0; i--)
if (sig[i] != SigBit(State::S0))
break;
++i;
return sig.extract(0, i);
};
sigA = param(mul, \A_SIGNED).as_bool() ? unextend_signed(port(mul, \A)) : unextend_unsigned(port(mul, \A));
sigB = param(mul, \B_SIGNED).as_bool() ? unextend_signed(port(mul, \B)) : unextend_unsigned(port(mul, \B));
SigSpec O;
if (mul->type == $mul)