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smt2: Fix $shift/$shiftx with negative shift ammounts 

Fixes #3431, fixes #3344
This commit is contained in:
Jannis Harder 2022-08-02 20:16:41 +02:00
parent 7d4f87d69f
commit 6af5e74f95
1 changed files with 4 additions and 4 deletions
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8
backends/smt2/smt2.cc
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@ -449,7 +449,7 @@ struct Smt2Worker
bool is_signed = cell->getParam(ID::A_SIGNED).as_bool();
int width = GetSize(sig_y);
if (type == 's' || type == 'd' || type == 'b') {
if (type == 's' || type == 'S' || type == 'd' || type == 'b') {
width = max(width, GetSize(cell->getPort(ID::A)));
if (cell->hasPort(ID::B))
width = max(width, GetSize(cell->getPort(ID::B)));
@ -462,7 +462,7 @@ struct Smt2Worker
if (cell->hasPort(ID::B)) {
sig_b = cell->getPort(ID::B);
sig_b.extend_u0(width, is_signed && !(type == 's'));
sig_b.extend_u0(width, (type == 'S') || (is_signed && !(type == 's')));
}
std::string processed_expr;
@ -619,8 +619,8 @@ struct Smt2Worker
if (cell->type.in(ID($shift), ID($shiftx))) {
if (cell->getParam(ID::B_SIGNED).as_bool()) {
return export_bvop(cell, stringf("(ite (bvsge P #b%0*d) "
"(bvlshr A B) (bvlshr A (bvneg B)))",
GetSize(cell->getPort(ID::B)), 0), 's');
"(bvlshr A B) (bvshl A (bvneg B)))",
GetSize(cell->getPort(ID::B)), 0), 'S'); // type 'S' sign extends B
} else {
return export_bvop(cell, "(bvlshr A B)", 's');
}