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Filter mul-add constraints (#512)

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Daniel Lubarov 2022-03-15 09:24:10 -07:00 committed by GitHub
parent 310493c293
commit 627e80bfd5
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1 changed files with 4 additions and 1 deletions
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5
system_zero/src/alu/mul_add.rs
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@ -47,6 +47,7 @@ pub(crate) fn eval_mul_add<F: Field, P: PackedField<Scalar = F>>(
let result_canonical_inv = local_values[COL_MUL_ADD_RESULT_CANONICAL_INV];
let computed_output = factor_0 * factor_1 + addend;
// TODO: Needs to be filtered by IS_MUL_ADD.
let output = combine_u16s_check_canonical(
output_1,
output_2,
@ -55,7 +56,7 @@ pub(crate) fn eval_mul_add<F: Field, P: PackedField<Scalar = F>>(
result_canonical_inv,
yield_constr,
);
yield_constr.constraint(computed_output - output);
yield_constr.constraint(is_mul * (computed_output - output));
}
pub(crate) fn eval_mul_add_recursively<F: RichField + Extendable<D>, const D: usize>(
@ -74,6 +75,7 @@ pub(crate) fn eval_mul_add_recursively<F: RichField + Extendable<D>, const D: us
let result_canonical_inv = local_values[COL_MUL_ADD_RESULT_CANONICAL_INV];
let computed_output = builder.mul_add_extension(factor_0, factor_1, addend);
// TODO: Needs to be filtered by IS_MUL_ADD.
let output = combine_u16s_check_canonical_circuit(
builder,
output_1,
@ -84,5 +86,6 @@ pub(crate) fn eval_mul_add_recursively<F: RichField + Extendable<D>, const D: us
yield_constr,
);
let diff = builder.sub_extension(computed_output, output);
let filtered_diff = builder.mul_extension(is_mul, diff);
yield_constr.constraint(builder, diff);
}