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Don't evaluate GMP comparison multiple times #18321

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Apr 14, 2025
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Don't evaluate GMP comparison multiple times #18321

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6 changes: 4 additions & 2 deletions ext/gmp/gmp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -480,7 +480,8 @@ static int gmp_compare(zval *op1, zval *op2) /* {{{ */
return ZEND_UNCOMPARABLE;
}

return ZEND_THREEWAY_COMPARE(mpz_cmp(gmp_op1, gmp_op2), 0);
int ret = mpz_cmp(gmp_op1, gmp_op2); /* avoid multiple evaluations */
return ZEND_THREEWAY_COMPARE(ret, 0);
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is it somehow possible to put this into the macro itself?

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Not without relying on non-portable GCC extensions.

}
/* }}} */

Expand Down Expand Up @@ -1422,7 +1423,8 @@ ZEND_FUNCTION(gmp_cmp)
GMP_Z_PARAM_INTO_MPZ_PTR(gmpnum_b)
ZEND_PARSE_PARAMETERS_END();

RETURN_LONG(ZEND_THREEWAY_COMPARE(mpz_cmp(gmpnum_a, gmpnum_b), 0));
int ret = mpz_cmp(gmpnum_a, gmpnum_b); /* avoid multiple evaluations */
RETURN_LONG(ZEND_THREEWAY_COMPARE(ret, 0));
}
/* }}} */

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