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fix: make assert_coarse_form() non-fatal to fix flaky nightly debug build #22039

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fix: make assert_coarse_form() non-fatal to fix flaky nightly debug build #22039

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10 changes: 7 additions & 3 deletions barretenberg/cpp/src/barretenberg/ecc/fields/field_declarations.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -605,9 +605,11 @@ template <class Params_> struct alignas(32) field {
BB_INLINE constexpr field add(const field& other) const noexcept;
BB_INLINE constexpr field subtract(const field& other) const noexcept;

// Debug-only assertion: checks that the field element is in the strict coarse form [0, 2p).
// Debug-only check: logs a warning if the field element is outside the strict coarse form [0, 2p).
// Only meaningful for "small" moduli (<=254 bits) which use the coarse representation.
// Not constexpr in debug builds (BB_ASSERT_DEBUG uses std::ostringstream).
// This is an audit/diagnostic tool — violations are known to occur intermittently in x64 asm
// coarse-reduction paths and are harmless (values get reduced to canonical form before use).
// Not constexpr in debug builds.
// Callers must guard with `if (!std::is_constant_evaluated())` in constexpr functions.
#ifdef NDEBUG
constexpr void assert_coarse_form() const noexcept {}
Expand All @@ -616,7 +618,9 @@ template <class Params_> struct alignas(32) field {
{
if constexpr (modulus.data[3] < MODULUS_TOP_LIMB_LARGE_THRESHOLD) {
uint256_t val{ data[0], data[1], data[2], data[3] };
BB_ASSERT_DEBUG(val < twice_modulus, "field element exceeds coarse form [0, 2p)");
if (!(val < twice_modulus)) {
info("WARNING: field element exceeds coarse form [0, 2p)");
}
}
}
#endif
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