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Fix spurious jnf underflows (bug 14155).

This commit is contained in:
Joseph Myers 2013-09-02 14:51:24 +00:00
parent 8220f4f008
commit b7835e3223
6 changed files with 68 additions and 10 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2013-09-02 Joseph Myers <joseph@codesourcery.com>
[BZ #14155]
* sysdeps/ieee754/flt-32/e_jnf.c (__ieee754_jnf): Use double for
intermediate calculations in recurrence.
(__ieee754_ynf): Likewise.
* math/libm-test.inc (jn_test_data): Do not allow spurious
underflow exception. Add more tests.
(yn_test_data): Add more tests.
* sysdeps/i386/fpu/libm-test-ulps: Update.
* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2013-09-02 Ondřej Bílka <neleai@seznam.cz>
* sysdeps/powerpc/powerpc32/power6/memcpy.S: Fix typo.

4
NEWS
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@ -9,8 +9,8 @@ Version 2.19
* The following bugs are resolved with this release:
14699, 15522, 15531, 15532, 15736, 15749, 15797, 15867, 15890, 15897,
15905, 15909.
14155, 14699, 15522, 15531, 15532, 15736, 15749, 15797, 15867, 15890,
15897, 15905, 15909.
* CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
to the d_name member of struct dirent, or omit the terminating NUL

19
math/libm-test.inc
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@ -9913,8 +9913,14 @@ static const struct test_if_f_data jn_test_data[] =
TEST_if_f (jn, 8, 2.4048255576957729L, 0.92165786705344923232879022467054148E-4L),
TEST_if_f (jn, 9, 2.4048255576957729L, 0.12517270977961513005428966643852564E-4L),
/* Bug 14155: spurious exception may occur. */
TEST_if_f (jn, 2, 0x1.ffff62p+99L, -4.43860668048170034334926693188979974489e-16L, UNDERFLOW_EXCEPTION_OK),
TEST_if_f (jn, 2, 0x1.ffff62p+99L, -4.43860668048170034334926693188979974489e-16L),
TEST_if_f (jn, 2, 0x1p127L, -6.0784021821505059176832624052765568656702e-20L),
#ifndef TEST_FLOAT
TEST_if_f (jn, 2, 0x1p1023L, 1.5665258060609012834424478437196679802783e-155L),
#endif
#if defined TEST_LDOUBLE && LDBL_MAX_EXP >= 16384
TEST_if_f (jn, 2, 0x1p16383L, -9.5859502826270374691362975419147645151233e-2467L),
#endif
};
static void
@ -14531,6 +14537,15 @@ static const struct test_if_f_data yn_test_data[] =
/* Check whether yn returns correct value for LDBL_MIN, DBL_MIN,
and FLT_MIN. See Bug 14173. */
TEST_if_f (yn, 10, min_value, minus_infty, OVERFLOW_EXCEPTION|ERRNO_ERANGE),
TEST_if_f (yn, 2, 0x1.ffff62p+99L, -5.5244413477397111790415387179517953221757e-16L),
TEST_if_f (yn, 2, 0x1p127L, 6.8569250690166637098111268958532649249771e-21L),
#ifndef TEST_FLOAT
TEST_if_f (yn, 2, 0x1p1023L, -8.2687542933709649327986678723012001545638e-155L),
#endif
#if defined TEST_LDOUBLE && LDBL_MAX_EXP >= 16384
TEST_if_f (yn, 2, 0x1p16383L, 3.8895531955766020648617743624167352352217e-2467L),
#endif
};
static void

20
sysdeps/i386/fpu/libm-test-ulps
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@ -5635,9 +5635,9 @@ ildouble: 1
ldouble: 1
Test "jn (10, 10.0)":
double: 1
float: 1
float: 2
idouble: 1
ifloat: 1
ifloat: 2
ildouble: 2
ldouble: 2
Test "jn (10, 2.0)":
@ -5648,6 +5648,14 @@ float: 1
ifloat: 1
ildouble: 1
ldouble: 1
Test "jn (2, 0x1p1023)":
double: 1
idouble: 1
Test "jn (2, 0x1p127)":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "jn (2, 2.4048255576957729)":
double: 1
float: 1
@ -6844,6 +6852,14 @@ ifloat: 1
Test "yn (10, 2.0)":
float: 3
ifloat: 3
Test "yn (2, 0x1.ffff62p+99)":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "yn (2, 0x1p127)":
float: 2
ifloat: 2
Test "yn (3, 0.125)":
ildouble: 1
ldouble: 1

4
sysdeps/ieee754/flt-32/e_jnf.c
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@ -54,7 +54,7 @@ __ieee754_jnf(int n, float x)
b = __ieee754_j1f(x);
for(i=1;i<n;i++){
temp = b;
b = b*((float)(i+i)/x) - a; /* avoid underflow */
b = b*((double)(i+i)/x) - a; /* avoid underflow */
a = temp;
}
} else {
@ -196,7 +196,7 @@ __ieee754_ynf(int n, float x)
GET_FLOAT_WORD(ib,b);
for(i=1;i<n&&ib!=0xff800000;i++){
temp = b;
b = ((float)(i+i)/x)*b - a;
b = ((double)(i+i)/x)*b - a;
GET_FLOAT_WORD(ib,b);
a = temp;
}

19
sysdeps/x86_64/fpu/libm-test-ulps
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@ -6403,6 +6403,11 @@ idouble: 2
ifloat: 2
ildouble: 1
ldouble: 1
Test "jn (2, 0x1p127)":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "jn (2, 2.4048255576957729)":
double: 2
float: 1
@ -7728,6 +7733,16 @@ double: 3
float: 1
idouble: 3
ifloat: 1
Test "yn (2, 0x1.ffff62p+99)":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "yn (2, 0x1p127)":
double: 1
float: 3
idouble: 1
ifloat: 3
Test "yn (3, 0.125)":
double: 1
idouble: 1
@ -8428,9 +8443,9 @@ ldouble: 2
Function: "yn":
double: 3
float: 2
float: 3
idouble: 3
ifloat: 2
ifloat: 3
ildouble: 4
ldouble: 4