Author: das
Date: Mon Jun 3 09:15:15 2013
New Revision: 251293
URL: http://svnweb.freebsd.org/changeset/base/251293
Log:
Add more tests for log functions. A few are commented out because the
long double versions don't pass yet. (They are rather nit-picky cases,
so there's ongoing discussion with Bruce about whether it is worth the
performance cost.)
Modified:
head/tools/regression/lib/msun/test-logarithm.c
Modified: head/tools/regression/lib/msun/test-logarithm.c
==============================================================================
--- head/tools/regression/lib/msun/test-logarithm.c Mon Jun 3 09:14:31
2013 (r251292)
+++ head/tools/regression/lib/msun/test-logarithm.c Mon Jun 3 09:15:15
2013 (r251293)
@@ -65,20 +65,37 @@ __FBSDID("$FreeBSD$");
assert(((void)(func), fetestexcept(exceptmask) == (excepts))); \
} while (0)
+#define test(func, x, result, exceptmask, excepts) do {
\
+ volatile long double _d = x; \
+ assert(feclearexcept(FE_ALL_EXCEPT) == 0); \
+ assert(fpequal((func)(_d), (result))); \
+ assert(((void)(func), fetestexcept(exceptmask) == (excepts))); \
+} while (0)
+
+#define test_tol(func, z, result, tol) do {
\
+ volatile long double _d = z; \
+ debug(" testing %6s(%15La) ~= % .36Le\n", #func, _d, result); \
+ assert(fpequal_tol((func)(_d), (result), (tol), CS_BOTH)); \
+} while (0)
+
/* Test all the functions that compute log(x). */
#define testall0(x, result, exceptmask, excepts) do {
\
test(log, x, result, exceptmask, excepts); \
test(logf, x, result, exceptmask, excepts); \
+ test(logl, x, result, exceptmask, excepts); \
test(log2, x, result, exceptmask, excepts); \
test(log2f, x, result, exceptmask, excepts); \
+ test(log2l, x, result, exceptmask, excepts); \
test(log10, x, result, exceptmask, excepts); \
test(log10f, x, result, exceptmask, excepts); \
+ test(log10l, x, result, exceptmask, excepts); \
} while (0)
/* Test all the functions that compute log(1+x). */
#define testall1(x, result, exceptmask, excepts) do {
\
test(log1p, x, result, exceptmask, excepts); \
test(log1pf, x, result, exceptmask, excepts); \
+ test(log1pl, x, result, exceptmask, excepts); \
} while (0)
void
@@ -128,6 +145,13 @@ run_log2_tests(void)
assert(log2(ldexp(1.0, i)) == i);
assert(fetestexcept(ALL_STD_EXCEPT) == 0);
}
+ for (i = LDBL_MIN_EXP - LDBL_MANT_DIG; i < LDBL_MAX_EXP; i++) {
+ assert(log2l(ldexpl(1.0, i)) == i);
+#if 0
+ /* XXX This test does not pass yet. */
+ assert(fetestexcept(ALL_STD_EXCEPT) == 0);
+#endif
+ }
}
void
@@ -139,7 +163,17 @@ run_roundingmode_tests(void)
*/
fesetround(FE_DOWNWARD);
/* These are still positive per IEEE 754R */
+#if 0
testall0(1.0, 0.0, ALL_STD_EXCEPT, 0);
+#else
+ /* logl, log2l, and log10l don't pass yet. */
+ test(log, 1.0, 0.0, ALL_STD_EXCEPT, 0);
+ test(logf, 1.0, 0.0, ALL_STD_EXCEPT, 0);
+ test(log2, 1.0, 0.0, ALL_STD_EXCEPT, 0);
+ test(log2f, 1.0, 0.0, ALL_STD_EXCEPT, 0);
+ test(log10, 1.0, 0.0, ALL_STD_EXCEPT, 0);
+ test(log10f, 1.0, 0.0, ALL_STD_EXCEPT, 0);
+#endif
testall1(0.0, 0.0, ALL_STD_EXCEPT, 0);
fesetround(FE_TOWARDZERO);
testall0(1.0, 0.0, ALL_STD_EXCEPT, 0);
@@ -154,11 +188,84 @@ run_roundingmode_tests(void)
fesetround(FE_TONEAREST);
}
+void
+run_accuracy_tests(void)
+{
+ static const struct {
+ float x;
+ long double log2x;
+ long double logex;
+ long double log10x;
+ } tests[] = {
+ { 0x1p-120 + 0x1p-140,
+ -1.19999998624139449158861798943319717e2L,
+ -8.31776607135195754708796206665656732e1L,
+ -3.61235990655024477716980559136055915e1L,
+ },
+ { 1.0 - 0x1p-20,
+ -1.37586186296463416424364914705656460e-6L,
+ -9.53674771153890007250243736279163253e-7L,
+ -4.14175690642480911859354110516159131e-7L, },
+ { 1.0 + 0x1p-20,
+ 1.37586055084113820105668028340371476e-6L,
+ 9.53673861659188233908415514963336144e-7L,
+ 4.14175295653950611453333571759200697e-7L },
+ { 19.75,
+ 4.30378074817710292442728634194115348e0L,
+ 2.98315349134713087533848129856505779e0L,
+ 1.29556709996247903756734359702926363e0L },
+ { 19.75 * 0x1p100,
+ 1.043037807481771029244272863419411534e2L,
+ 7.229787154734166181706169344438271459e1L,
+ 3.139856666636059855894123306947856631e1L },
+ };
+ int i;
+
+ for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
+ test_tol(log2, tests[i].x, tests[i].log2x, DBL_ULP());
+ test_tol(log2f, tests[i].x, tests[i].log2x, FLT_ULP());
+ test_tol(log2l, tests[i].x, tests[i].log2x, LDBL_ULP());
+ test_tol(log, tests[i].x, tests[i].logex, DBL_ULP());
+ test_tol(logf, tests[i].x, tests[i].logex, FLT_ULP());
+ test_tol(logl, tests[i].x, tests[i].logex, LDBL_ULP());
+ test_tol(log10, tests[i].x, tests[i].log10x, DBL_ULP());
+ test_tol(log10f, tests[i].x, tests[i].log10x, FLT_ULP());
+ test_tol(log10l, tests[i].x, tests[i].log10x, LDBL_ULP());
+ if (tests[i].x >= 0.5) {
+ test_tol(log1p, tests[i].x - 1, tests[i].logex,
+ DBL_ULP());
+ test_tol(log1pf, tests[i].x - 1, tests[i].logex,
+ FLT_ULP());
+ test_tol(log1pl, tests[i].x - 1, tests[i].logex,
+ LDBL_ULP());
+ }
+ }
+}
+
+void
+run_log1p_accuracy_tests(void)
+{
+
+ test_tol(log1pf, 0x0.333333p0F,
+ 1.82321546859847114303367992804596800640e-1L, FLT_ULP());
+ test_tol(log1p, 0x0.3333333333333p0,
+ 1.82321556793954589204283870982629267635e-1L, DBL_ULP());
+ test_tol(log1pl, 0x0.33333333333333332p0L,
+ 1.82321556793954626202683007050468762914e-1L, LDBL_ULP());
+
+ test_tol(log1pf, -0x0.333333p0F,
+ -2.23143536413048672940940199918017467652e-1L, FLT_ULP());
+ test_tol(log1p, -0x0.3333333333333p0,
+ -2.23143551314209700255143859052009022937e-1L, DBL_ULP());
+ test_tol(log1pl, -0x0.33333333333333332p0L,
+ -2.23143551314209755752742563153765697950e-1L, LDBL_ULP());
+}
+
int
main(int argc, char *argv[])
{
- printf("1..3\n");
+ printf("1..5\n");
run_generic_tests();
printf("ok 1 - logarithm\n");
@@ -169,5 +276,11 @@ main(int argc, char *argv[])
run_roundingmode_tests();
printf("ok 3 - logarithm\n");
+ run_accuracy_tests();
+ printf("ok 4 - logarithm\n");
+
+ run_log1p_accuracy_tests();
+ printf("ok 5 - logarithm\n");
+
return (0);
}
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