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[circt-bmc][VerifToSMT] Pop existing assertions on each cycle #7900

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Merged
merged 1 commit into from
Nov 26, 2024
+10 −0
Merged

[circt-bmc][VerifToSMT] Pop existing assertions on each cycle #7900

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7 changes: 7 additions & 0 deletions lib/Conversion/VerifToSMT/VerifToSMT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -258,6 +258,9 @@ struct VerifBoundedModelCheckingOpConversion
ValueRange initVals =
rewriter.create<func::CallOp>(loc, initFuncOp)->getResults();

// Initial push
rewriter.create<smt::PushOp>(loc, 1);

// InputDecls order should be <circuit arguments> <state arguments>
// <wasViolated>
// Get list of clock indexes in circuit args
Expand Down Expand Up @@ -297,6 +300,10 @@ struct VerifBoundedModelCheckingOpConversion
auto forOp = rewriter.create<scf::ForOp>(
loc, lowerBound, upperBound, step, inputDecls,
[&](OpBuilder &builder, Location loc, Value i, ValueRange iterArgs) {
// Drop existing assertions
builder.create<smt::PopOp>(loc, 1);
builder.create<smt::PushOp>(loc, 1);

// Execute the circuit
ValueRange circuitCallOuts =
builder
Expand Down
3 changes: 3 additions & 0 deletions test/Conversion/VerifToSMT/verif-to-smt.mlir
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Expand Up @@ -90,6 +90,7 @@ func.func @test_lec(%arg0: !smt.bv<1>) -> (i1, i1, i1) {
// CHECK-LABEL: func.func @test_bmc() -> i1 {
// CHECK: [[BMC:%.+]] = smt.solver
// CHECK: [[INIT:%.+]]:2 = func.call @bmc_init()
// CHECK: smt.push 1
// CHECK: [[F0:%.+]] = smt.declare_fun : !smt.bv<32>
// CHECK: [[F1:%.+]] = smt.declare_fun : !smt.bv<32>
// CHECK: [[C0_I32:%.+]] = arith.constant 0 : i32
Expand All @@ -98,6 +99,8 @@ func.func @test_lec(%arg0: !smt.bv<1>) -> (i1, i1, i1) {
// CHECK: [[FALSE:%.+]] = arith.constant false
// CHECK: [[TRUE:%.+]] = arith.constant true
// CHECK: [[FOR:%.+]]:5 = scf.for [[ARG0:%.+]] = [[C0_I32]] to [[C10_I32]] step [[C1_I32]] iter_args([[ARG1:%.+]] = [[INIT]]#0, [[ARG2:%.+]] = [[F0]], [[ARG3:%.+]] = [[F1]], [[ARG4:%.+]] = [[INIT]]#1, [[ARG5:%.+]] = [[FALSE]])
// CHECK: smt.pop 1
// CHECK: smt.push 1
// CHECK: [[CIRCUIT:%.+]]:2 = func.call @bmc_circuit([[ARG1]], [[ARG2]], [[ARG3]])
// CHECK: [[SMTCHECK:%.+]] = smt.check sat {
// CHECK: smt.yield [[TRUE]]
Expand Down