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fix LUT synthesis

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-02-04 15:34:15 -08:00
parent c562a1f883
commit fcfb76960f
1 changed files with 12 additions and 19 deletions
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31
src/sat/sat_lut_finder.cpp
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@ -239,27 +239,20 @@ namespace sat {
v = vars[i];
vars.erase(v);
uint64_t r = 0;
unsigned stride_sz = (1u << i);
unsigned num_strides = (1u << vars.size()) / (stride_sz * 2);
switch (i) {
case 0:
for (unsigned j = 0; j < (1u << vars.size()); ++j) {
if (0 == (m_combination & (1ull << 2*j))) {
r |= (1ull << j);
uint64_t m = m_masks[vars.size()];
unsigned offset = 0;
// example, if i = 2, then we are examining
// how m_combination evaluates at position xy0uv
// If it evaluates to 0, then it has to evaluate to 1 on position xy1uv
// Offset keeps track of the value of xyuv
//
for (unsigned j = 0; j < 64; ++j) {
if (0 != (m & (1ull << j))) {
if (0 == (m_combination & (1ull << j))) {
r |= 1ull << offset;
}
++offset;
}
break;
case 1:
// (0, 2) (1, 3), (4, 6), (5, 7)
for (unsigned j = 0; j < (1u << vars.size()); ++j) {
}
// TBD
break;
default:
// TBD
break;
}
return r;
}