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booth: Do not special-case bottom rows 

Later on all the rows are cropped to the target size anyway, so there's
no harm in transitionally including extra top bits.
This commit is contained in:
Martin Povišer 2023-11-22 12:42:11 +01:00
parent da207cdce0
commit 579f6bdc17
1 changed files with 1 additions and 19 deletions
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20
passes/techmap/booth.cc
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@ -331,7 +331,7 @@ struct BoothPassWorker {
// data, shift, sign
ppij_int.push_back(std::make_tuple(ppij_row_0, 0, s_int[0]));
for (int i = 1; i < encoder_count - 2; i++) {
for (int i = 1; i < encoder_count; i++) {
// format 1,S.Data.shift = encoder_ix*2,sign = sb_int[i]
SigSpec ppij_row_n;
@ -345,24 +345,6 @@ struct BoothPassWorker {
ppij_int.push_back(std::make_tuple(ppij_row_n, i * 2, s_int[i]));
}
// Build second to last row
// format S/,Data + sign bit
SigSpec ppij_row_em1;
BuildBoothUMultDecoderRowN(module, X, one_int[encoder_count - 2], two_int[encoder_count - 2], s_int[encoder_count - 2],
sb_int[encoder_count - 2], ppij_row_em1, encoder_count - 2,
false, // include sign
true // no constant
);
ppij_int.push_back(std::make_tuple(ppij_row_em1, (encoder_count - 2) * 2, s_int[encoder_count - 2]));
// Build last row
// format Data + sign bit
SigSpec ppij_row_e;
BuildBoothUMultDecoderRowN(module, X, one_int[encoder_count - 1], two_int[encoder_count - 1], s_int[encoder_count - 1],
sb_int[encoder_count - 1], ppij_row_e, encoder_count - 1,
true, // no sign
true // no constant
);
ppij_int.push_back(std::make_tuple(ppij_row_e, (encoder_count - 1) * 2, s_int[encoder_count - 1]));
// Debug dump out partial products
// DebugDumpPP(ppij_int);