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Also optimise MSB of $sub

This commit is contained in:
Eddie Hung 2019-07-19 13:11:48 -07:00
parent 5bd088a686
commit bcd8027182
1 changed files with 3 additions and 3 deletions
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6
passes/opt/wreduce.cc
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@ -342,9 +342,9 @@ struct WreduceWorker
}
}
if (cell->type.in("$pos", "$add", "$mul", "$and", "$or", "$xor"))
if (cell->type.in("$pos", "$add", "$mul", "$and", "$or", "$xor", "$sub"))
{
bool is_signed = cell->getParam("\\A_SIGNED").as_bool();
bool is_signed = cell->getParam("\\A_SIGNED").as_bool() || cell->type == "$sub";
int a_size = 0, b_size = 0;
if (cell->hasPort("\\A")) a_size = GetSize(cell->getPort("\\A"));
@ -352,7 +352,7 @@ struct WreduceWorker
int max_y_size = max(a_size, b_size);
if (cell->type == "$add")
if (cell->type.in("$add", "$sub"))
max_y_size++;
if (cell->type == "$mul")