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lib/msun/tests/rem_test.c

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* Test for remainder functions: remainder, remainderf, remainderl, * Test for remainder functions: remainder, remainderf, remainderl,
* remquo, remquof, and remquol. * remquo, remquof, and remquol.
* Missing tests: fmod, fmodf. * Missing tests: fmod, fmodf.
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__FBSDID("$FreeBSD$"); __FBSDID("$FreeBSD$");
#include <assert.h>
#include <float.h> #include <float.h>
#include <math.h> #include <math.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <strings.h> #include <strings.h>
#include "test-utils.h"
static void test_invalid(long double, long double); static void test_invalid(long double, long double);
static void testl(long double, long double, long double, int); static void testl(long double, long double, long double, int);
static void testd(double, double, double, int); static void testd(double, double, double, int);
static void testf(float, float, float, int); static void testf(float, float, float, int);
#define test(x, y, e_r, e_q) do { \ #define test(x, y, e_r, e_q) do { \
testl(x, y, e_r, e_q); \ testl(x, y, e_r, e_q); \
testd(x, y, e_r, e_q); \ testd(x, y, e_r, e_q); \
testf(x, y, e_r, e_q); \ testf(x, y, e_r, e_q); \
} while (0) } while (0)
int ATF_TC_WITHOUT_HEAD(rem1);
main(void) ATF_TC_BODY(rem1, tc)
{ {
printf("1..3\n");
test_invalid(0.0, 0.0); test_invalid(0.0, 0.0);
test_invalid(1.0, 0.0); test_invalid(1.0, 0.0);
test_invalid(INFINITY, 0.0); test_invalid(INFINITY, 0.0);
test_invalid(INFINITY, 1.0); test_invalid(INFINITY, 1.0);
test_invalid(-INFINITY, 1.0); test_invalid(-INFINITY, 1.0);
test_invalid(NAN, 1.0); test_invalid(NAN, 1.0);
test_invalid(1.0, NAN); test_invalid(1.0, NAN);
test(4, 4, 0, 1); test(4, 4, 0, 1);
test(0, 3.0, 0, 0); test(0, 3.0, 0, 0);
testd(0x1p-1074, 1, 0x1p-1074, 0); testd(0x1p-1074, 1, 0x1p-1074, 0);
testf(0x1p-149, 1, 0x1p-149, 0); testf(0x1p-149, 1, 0x1p-149, 0);
test(3.0, 4, -1, 1); test(3.0, 4, -1, 1);
test(3.0, -4, -1, -1); test(3.0, -4, -1, -1);
testd(275 * 1193040, 275, 0, 1193040); testd(275 * 1193040, 275, 0, 1193040);
test(4.5 * 7.5, 4.5, -2.25, 8); /* we should get the even one */ test(4.5 * 7.5, 4.5, -2.25, 8); /* we should get the even one */
testf(0x1.9044f6p-1, 0x1.ce662ep-1, -0x1.f109cp-4, 1); testf(0x1.9044f6p-1, 0x1.ce662ep-1, -0x1.f109cp-4, 1);
#if LDBL_MANT_DIG > 53 #if LDBL_MANT_DIG > 53
testl(-0x1.23456789abcdefp-2000L, 0x1.fedcba987654321p-2000L, testl(-0x1.23456789abcdefp-2000L, 0x1.fedcba987654321p-2000L,
0x1.b72ea61d950c862p-2001L, -1); 0x1.b72ea61d950c862p-2001L, -1);
#endif #endif
}
printf("ok 1 - rem\n"); ATF_TC_WITHOUT_HEAD(rem2);
ATF_TC_BODY(rem2, tc)
{
/* /*
* The actual quotient here is 864062210.50000003..., but * The actual quotient here is 864062210.50000003..., but
* double-precision division gets -8.64062210.5, which rounds * double-precision division gets -8.64062210.5, which rounds
* the wrong way. This test ensures that remquo() is smart * the wrong way. This test ensures that remquo() is smart
* enough to get the low-order bit right. * enough to get the low-order bit right.
*/ */
testd(-0x1.98260f22fc6dep-302, 0x1.fb3167c430a13p-332, testd(-0x1.98260f22fc6dep-302, 0x1.fb3167c430a13p-332,
0x1.fb3165b82de72p-333, -864062211); 0x1.fb3165b82de72p-333, -864062211);
/* Even harder cases with greater exponent separation */ /* Even harder cases with greater exponent separation */
test(0x1.fp100, 0x1.ep-40, -0x1.cp-41, 143165577); test(0x1.fp100, 0x1.ep-40, -0x1.cp-41, 143165577);
testd(-0x1.abcdefp120, 0x1.87654321p-120, testd(-0x1.abcdefp120, 0x1.87654321p-120, -0x1.69c78ec4p-121,
-0x1.69c78ec4p-121, -63816414); -63816414);
}
printf("ok 2 - rem\n"); ATF_TC_WITHOUT_HEAD(rem3);
ATF_TC_BODY(rem3, tc)
{
test(0x1.66666cp+120, 0x1p+71, 0.0, 1476395008); test(0x1.66666cp+120, 0x1p+71, 0.0, 1476395008);
testd(-0x1.0000000000003p+0, 0x1.0000000000003p+0, -0.0, -1); testd(-0x1.0000000000003p+0, 0x1.0000000000003p+0, -0.0, -1);
testl(-0x1.0000000000003p+0, 0x1.0000000000003p+0, -0.0, -1); testl(-0x1.0000000000003p+0, 0x1.0000000000003p+0, -0.0, -1);
testd(-0x1.0000000000001p-749, 0x1.4p-1072, 0x1p-1074, -1288490189); testd(-0x1.0000000000001p-749, 0x1.4p-1072, 0x1p-1074, -1288490189);
testl(-0x1.0000000000001p-749, 0x1.4p-1072, 0x1p-1074, -1288490189); testl(-0x1.0000000000001p-749, 0x1.4p-1072, 0x1p-1074, -1288490189);
printf("ok 3 - rem\n");
return (0);
} }
static void static void
test_invalid(long double x, long double y) test_invalid(long double x, long double y)
{ {
int q; int q;
q = 0xdeadbeef; q = 0xdeadbeef;
assert(isnan(remainder(x, y))); ATF_CHECK(isnan(remainder(x, y)));
assert(isnan(remquo(x, y, &q))); ATF_CHECK(isnan(remquo(x, y, &q)));
#ifdef STRICT #ifdef STRICT
assert(q == 0xdeadbeef); ATF_CHECK(q == 0xdeadbeef);
#endif #endif
assert(isnan(remainderf(x, y))); ATF_CHECK(isnan(remainderf(x, y)));
assert(isnan(remquof(x, y, &q))); ATF_CHECK(isnan(remquof(x, y, &q)));
#ifdef STRICT #ifdef STRICT
assert(q == 0xdeadbeef); ATF_CHECK(q == 0xdeadbeef);
#endif #endif
assert(isnan(remainderl(x, y))); ATF_CHECK(isnan(remainderl(x, y)));
assert(isnan(remquol(x, y, &q))); ATF_CHECK(isnan(remquol(x, y, &q)));
#ifdef STRICT #ifdef STRICT
assert(q == 0xdeadbeef); ATF_CHECK(q == 0xdeadbeef);
#endif #endif
} }
/* 0x012345 ==> 0x01ffff */ /* 0x012345 ==> 0x01ffff */
static inline int static inline int
mask(int x) mask(int x)
{ {
return ((unsigned)~0 >> (32 - fls(x))); return ((unsigned)~0 >> (32 - fls(x)));
} }
static void static void
testl(long double x, long double y, long double expected_rem, int expected_quo) testl(long double x, long double y, long double expected_rem, int expected_quo)
{ {
int q; int q;
long double rem; long double rem;
q = random(); q = random();
rem = remainderl(x, y); rem = remainderl(x, y);
assert(rem == expected_rem); ATF_CHECK(rem == expected_rem);
assert(!signbit(rem) == !signbit(expected_rem)); ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
rem = remquol(x, y, &q); rem = remquol(x, y, &q);
assert(rem == expected_rem); ATF_CHECK(rem == expected_rem);
assert(!signbit(rem) == !signbit(expected_rem)); ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
assert((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */ ATF_CHECK((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */
assert((q & 0x7) == (expected_quo & 0x7)); ATF_CHECK((q & 0x7) == (expected_quo & 0x7));
if (q != 0) { if (q != 0) {
assert((q > 0) ^ !(expected_quo > 0)); ATF_CHECK((q > 0) ^ !(expected_quo > 0));
q = abs(q); q = abs(q);
assert(q == (abs(expected_quo) & mask(q))); ATF_CHECK(q == (abs(expected_quo) & mask(q)));
} }
} }
static void static void
testd(double x, double y, double expected_rem, int expected_quo) testd(double x, double y, double expected_rem, int expected_quo)
{ {
int q; int q;
double rem; double rem;
q = random(); q = random();
rem = remainder(x, y); rem = remainder(x, y);
assert(rem == expected_rem); ATF_CHECK(rem == expected_rem);
assert(!signbit(rem) == !signbit(expected_rem)); ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
rem = remquo(x, y, &q); rem = remquo(x, y, &q);
assert(rem == expected_rem); ATF_CHECK(rem == expected_rem);
assert(!signbit(rem) == !signbit(expected_rem)); ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
assert((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */ ATF_CHECK((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */
assert((q & 0x7) == (expected_quo & 0x7)); ATF_CHECK((q & 0x7) == (expected_quo & 0x7));
if (q != 0) { if (q != 0) {
assert((q > 0) ^ !(expected_quo > 0)); ATF_CHECK((q > 0) ^ !(expected_quo > 0));
q = abs(q); q = abs(q);
assert(q == (abs(expected_quo) & mask(q))); ATF_CHECK(q == (abs(expected_quo) & mask(q)));
} }
} }
static void static void
testf(float x, float y, float expected_rem, int expected_quo) testf(float x, float y, float expected_rem, int expected_quo)
{ {
int q; int q;
float rem; float rem;
q = random(); q = random();
rem = remainderf(x, y); rem = remainderf(x, y);
assert(rem == expected_rem); ATF_CHECK(rem == expected_rem);
assert(!signbit(rem) == !signbit(expected_rem)); ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
rem = remquof(x, y, &q); rem = remquof(x, y, &q);
assert(rem == expected_rem); ATF_CHECK(rem == expected_rem);
assert(!signbit(rem) == !signbit(expected_rem)); ATF_CHECK(!signbit(rem) == !signbit(expected_rem));
assert((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */ ATF_CHECK((q ^ expected_quo) >= 0); /* sign(q) == sign(expected_quo) */
assert((q & 0x7) == (expected_quo & 0x7)); ATF_CHECK((q & 0x7) == (expected_quo & 0x7));
if (q != 0) { if (q != 0) {
assert((q > 0) ^ !(expected_quo > 0)); ATF_CHECK((q > 0) ^ !(expected_quo > 0));
q = abs(q); q = abs(q);
assert((q & mask(q)) == (abs(expected_quo) & mask(q))); ATF_CHECK((q & mask(q)) == (abs(expected_quo) & mask(q)));
} }
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, rem1);
ATF_TP_ADD_TC(tp, rem2);
ATF_TP_ADD_TC(tp, rem3);
return (atf_no_error());
} }