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Implementing number comparisons through simple comparison operators, checking under !JERRY_NDEBUG that behaviour is equivalent to ECMA-defined comparisons.

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This commit is contained in:
Ruben Ayrapetyan 2014-12-03 20:22:29 +03:00
parent 8998860c7b
commit b7daa16b99
1 changed files with 80 additions and 49 deletions
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129
src/libecmaoperations/ecma-comparison.c
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@ -76,25 +76,32 @@ ecma_op_abstract_equality_compare (ecma_value_t x, /**< first operand */
ecma_number_t x_num = *ecma_get_number_from_value (x);
ecma_number_t y_num = *ecma_get_number_from_value (y);
bool is_equal;
bool is_x_equal_to_y = (x_num == y_num);
#ifndef JERRY_NDEBUG
bool is_x_equal_to_y_check;
if (ecma_number_is_nan (x_num)
|| ecma_number_is_nan (y_num))
{
is_equal = false;
is_x_equal_to_y_check = false;
}
else if (x_num == y_num
|| (ecma_number_is_zero (x_num)
&& ecma_number_is_zero (y_num)))
{
is_equal = true;
is_x_equal_to_y_check = true;
}
else
{
is_equal = false;
is_x_equal_to_y_check = false;
}
ret_value = ecma_make_simple_completion_value (is_equal ? ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
JERRY_ASSERT (is_x_equal_to_y == is_x_equal_to_y_check);
#endif /* !JERRY_NDEBUG */
ret_value = ecma_make_simple_completion_value (is_x_equal_to_y ?
ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
}
else if (is_x_string)
{ // d.
@ -270,21 +277,31 @@ ecma_op_strict_equality_compare (ecma_value_t x, /**< first operand */
ecma_number_t x_num = *ecma_get_number_from_value (x);
ecma_number_t y_num = *ecma_get_number_from_value (y);
bool is_x_equal_to_y = (x_num == y_num);
#ifndef JERRY_NDEBUG
bool is_x_equal_to_y_check;
if (ecma_number_is_nan (x_num)
|| ecma_number_is_nan (y_num))
{
return false;
is_x_equal_to_y_check = false;
}
else if (x_num == y_num
|| (ecma_number_is_zero (x_num)
&& ecma_number_is_zero (y_num)))
{
return true;
is_x_equal_to_y_check = true;
}
else
{
return false;
is_x_equal_to_y_check = false;
}
JERRY_ASSERT (is_x_equal_to_y == is_x_equal_to_y_check);
#endif /* !JERRY_NDEBUG */
return is_x_equal_to_y;
}
// 5. If Type (x) is String, then return true if x and y are exactly the same sequence of characters
@ -362,55 +379,69 @@ ecma_op_abstract_relational_compare (ecma_value_t x, /**< first operand */
// c., d.
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
else if (*num_x_p == *num_y_p
|| (ecma_number_is_zero (*num_x_p)
&& ecma_number_is_zero (*num_y_p)))
{
// e., f., g.
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE);
}
else if (ecma_number_is_infinity (*num_x_p)
&& !ecma_number_is_negative (*num_x_p))
{
// h.
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE);
}
else if (ecma_number_is_infinity (*num_y_p)
&& !ecma_number_is_negative (*num_y_p))
{
// i.
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
}
else if (ecma_number_is_infinity (*num_y_p)
&& ecma_number_is_negative (*num_y_p))
{
// j.
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE);
}
else if (ecma_number_is_infinity (*num_x_p)
&& ecma_number_is_negative (*num_x_p))
{
// k.
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
}
else
{
// l.
JERRY_ASSERT (!ecma_number_is_nan (*num_x_p)
&& !ecma_number_is_infinity (*num_x_p));
JERRY_ASSERT (!ecma_number_is_nan (*num_y_p)
&& !ecma_number_is_infinity (*num_y_p));
JERRY_ASSERT (!(ecma_number_is_zero (*num_x_p)
&& ecma_number_is_zero (*num_y_p)));
bool is_x_less_than_y = (*num_x_p < *num_y_p);
if (*num_x_p < *num_y_p)
#ifndef JERRY_NDEBUG
bool is_x_less_than_y_check;
if (*num_x_p == *num_y_p
|| (ecma_number_is_zero (*num_x_p)
&& ecma_number_is_zero (*num_y_p)))
{
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_TRUE);
// e., f., g.
is_x_less_than_y_check = false;
}
else if (ecma_number_is_infinity (*num_x_p)
&& !ecma_number_is_negative (*num_x_p))
{
// h.
is_x_less_than_y_check = false;
}
else if (ecma_number_is_infinity (*num_y_p)
&& !ecma_number_is_negative (*num_y_p))
{
// i.
is_x_less_than_y_check = true;
}
else if (ecma_number_is_infinity (*num_y_p)
&& ecma_number_is_negative (*num_y_p))
{
// j.
is_x_less_than_y_check = false;
}
else if (ecma_number_is_infinity (*num_x_p)
&& ecma_number_is_negative (*num_x_p))
{
// k.
is_x_less_than_y_check = true;
}
else
{
ret_value = ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_FALSE);
// l.
JERRY_ASSERT (!ecma_number_is_nan (*num_x_p)
&& !ecma_number_is_infinity (*num_x_p));
JERRY_ASSERT (!ecma_number_is_nan (*num_y_p)
&& !ecma_number_is_infinity (*num_y_p));
JERRY_ASSERT (!(ecma_number_is_zero (*num_x_p)
&& ecma_number_is_zero (*num_y_p)));
if (*num_x_p < *num_y_p)
{
is_x_less_than_y_check = true;
}
else
{
is_x_less_than_y_check = false;
}
}
JERRY_ASSERT (is_x_less_than_y_check == is_x_less_than_y);
#endif /* !JERRY_NDEBUG */
ret_value = ecma_make_simple_completion_value (is_x_less_than_y ?
ECMA_SIMPLE_VALUE_TRUE : ECMA_SIMPLE_VALUE_FALSE);
}
ECMA_FINALIZE(ny);