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Fix exp10 errno setting on underflow (bug 6787).

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This commit is contained in:
Joseph Myers
2013-11-29 16:32:49 +00:00
parent ea3bc4e821
commit 2a77a467b2
6 changed files with 26 additions and 16 deletions
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6
math/libm-test.inc
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@@ -8134,10 +8134,12 @@ static const struct test_f_f_data exp10_test_data[] =
TEST_f_f (exp10, 4932, 1.0e4932L),
TEST_f_f (exp10, -4932, 1.0e-4932L, UNDERFLOW_EXCEPTION),
#endif
TEST_f_f (exp10, 1e5, plus_infty, OVERFLOW_EXCEPTION|ERRNO_ERANGE),
TEST_f_f (exp10, -1e5, 0, UNDERFLOW_EXCEPTION|ERRNO_ERANGE),
TEST_f_f (exp10, 1e6, plus_infty, OVERFLOW_EXCEPTION|ERRNO_ERANGE),
TEST_f_f (exp10, -1e6, 0, UNDERFLOW_EXCEPTION),
TEST_f_f (exp10, -1e6, 0, UNDERFLOW_EXCEPTION|ERRNO_ERANGE),
TEST_f_f (exp10, max_value, plus_infty, OVERFLOW_EXCEPTION|ERRNO_ERANGE),
TEST_f_f (exp10, -max_value, 0, UNDERFLOW_EXCEPTION),
TEST_f_f (exp10, -max_value, 0, UNDERFLOW_EXCEPTION|ERRNO_ERANGE),
TEST_f_f (exp10, 0.75L, 5.62341325190349080394951039776481231L),
};

2
math/w_exp10.c
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@@ -28,7 +28,7 @@ double
__exp10 (double x)
{
double z = __ieee754_exp10 (x);
if (__builtin_expect (!__finite (z), 0)
if (__builtin_expect (!__finite (z) || z == 0, 0)
&& __finite (x) && _LIB_VERSION != _IEEE_)
/* exp10 overflow (46) if x > 0, underflow (47) if x < 0. */
return __kernel_standard (x, x, 46 + !!__signbit (x));

2
math/w_exp10f.c
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@@ -28,7 +28,7 @@ float
__exp10f (float x)
{
float z = __ieee754_exp10f (x);
if (__builtin_expect (!__finitef (z), 0)
if (__builtin_expect (!__finitef (z) || z == 0, 0)
&& __finitef (x) && _LIB_VERSION != _IEEE_)
/* exp10f overflow (146) if x > 0, underflow (147) if x < 0. */
return __kernel_standard_f (x, x, 146 + !!__signbitf (x));

2
math/w_exp10l.c
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@@ -28,7 +28,7 @@ long double
__exp10l (long double x)
{
long double z = __ieee754_exp10l (x);
if (__builtin_expect (!__finitel (z), 0)
if (__builtin_expect (!__finitel (z) || z == 0, 0)
&& __finitel (x) && _LIB_VERSION != _IEEE_)
/* exp10l overflow (246) if x > 0, underflow (247) if x < 0. */
return __kernel_standard_l (x, x, 246 + !!__signbitl (x));