diff options
Diffstat (limited to 'py/runtime.c')
| -rw-r--r-- | py/runtime.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/py/runtime.c b/py/runtime.c index c12271f4e..2e2fa1d17 100644 --- a/py/runtime.c +++ b/py/runtime.c @@ -387,7 +387,9 @@ mp_obj_t mp_binary_op(mp_binary_op_t op, mp_obj_t lhs, mp_obj_t rhs) { if (rhs_val < 0) { // negative shift not allowed mp_raise_ValueError(MP_ERROR_TEXT("negative shift count")); - } else if (rhs_val >= (mp_int_t)BITS_PER_WORD || lhs_val > (MP_SMALL_INT_MAX >> rhs_val) || lhs_val < (MP_SMALL_INT_MIN >> rhs_val)) { + } else if (rhs_val >= (mp_int_t)(sizeof(lhs_val) * BITS_PER_BYTE) + || lhs_val > (MP_SMALL_INT_MAX >> rhs_val) + || lhs_val < (MP_SMALL_INT_MIN >> rhs_val)) { // left-shift will overflow, so use higher precision integer lhs = mp_obj_new_int_from_ll(lhs_val); goto generic_binary_op; @@ -404,10 +406,10 @@ mp_obj_t mp_binary_op(mp_binary_op_t op, mp_obj_t lhs, mp_obj_t rhs) { mp_raise_ValueError(MP_ERROR_TEXT("negative shift count")); } else { // standard precision is enough for right-shift - if (rhs_val >= (mp_int_t)BITS_PER_WORD) { + if (rhs_val >= (mp_int_t)(sizeof(lhs_val) * BITS_PER_BYTE)) { // Shifting to big amounts is underfined behavior // in C and is CPU-dependent; propagate sign bit. - rhs_val = BITS_PER_WORD - 1; + rhs_val = sizeof(lhs_val) * BITS_PER_BYTE - 1; } lhs_val >>= rhs_val; } |