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Constrain mem_channel.used flag to be binary (#800)

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Jacqueline Nabaglo 2022-11-02 10:14:33 -07:00 committed by GitHub
parent 0293a65a55
commit ea7fbed33a
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1 changed files with 19 additions and 6 deletions
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25
evm/src/cpu/membus.rs
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@ -35,14 +35,16 @@ pub const NUM_CHANNELS: usize = channel_indices::GP.end;
/// Calculates `lv.stack_len_bounds_aux`. Note that this must be run after decode.
pub fn generate<F: PrimeField64>(lv: &mut CpuColumnsView<F>) {
let cycle_filter = lv.is_cpu_cycle;
if cycle_filter == F::ZERO {
return;
if cycle_filter != F::ZERO {
assert!(lv.is_kernel_mode.to_canonical_u64() <= 1);
// Set `lv.code_context` to 0 if in kernel mode and to `lv.context` if in user mode.
lv.code_context = (F::ONE - lv.is_kernel_mode) * lv.context;
}
assert!(lv.is_kernel_mode.to_canonical_u64() <= 1);
// Set `lv.code_context` to 0 if in kernel mode and to `lv.context` if in user mode.
lv.code_context = (F::ONE - lv.is_kernel_mode) * lv.context;
for channel in lv.mem_channels {
assert!(channel.used.to_canonical_u64() <= 1);
}
}
pub fn eval_packed<P: PackedField>(
@ -54,6 +56,11 @@ pub fn eval_packed<P: PackedField>(
yield_constr.constraint(
lv.is_cpu_cycle * (lv.code_context - (P::ONES - lv.is_kernel_mode) * lv.context),
);
// Validate `channel.used`. It should be binary.
for channel in lv.mem_channels {
yield_constr.constraint(channel.used * (channel.used - P::ONES));
}
}
pub fn eval_ext_circuit<F: RichField + Extendable<D>, const D: usize>(
@ -67,4 +74,10 @@ pub fn eval_ext_circuit<F: RichField + Extendable<D>, const D: usize>(
let constr = builder.mul_sub_extension(lv.is_kernel_mode, lv.context, diff);
let filtered_constr = builder.mul_extension(lv.is_cpu_cycle, constr);
yield_constr.constraint(builder, filtered_constr);
// Validate `channel.used`. It should be binary.
for channel in lv.mem_channels {
let constr = builder.mul_sub_extension(channel.used, channel.used, channel.used);
yield_constr.constraint(builder, constr);
}
}