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glibc/sysdeps/ieee754/flt-32
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Szabolcs Nagy 505b5b2922 Fix powf overflow handling in non-nearest rounding mode [BZ #23961] 
The threshold value at which powf overflows depends on the rounding mode
and the current check did not take this into account. So when the result
was rounded away from zero it could become infinity without setting
errno to ERANGE.

Example: pow(0x1.7ac7cp+5, 23) is 0x1.fffffep+127 + 0.1633ulp

If the result goes above 0x1.fffffep+127 + 0.5ulp then errno is set,
which is fine in nearest rounding mode, but

  powf(0x1.7ac7cp+5, 23) is inf in upward rounding mode
  powf(-0x1.7ac7cp+5, 23) is -inf in downward rounding mode

and the previous implementation did not set errno in these cases.

The fix tries to avoid affecting the common code path or calling a
function that may introduce a stack frame, so float arithmetics is used
to check the rounding mode and the threshold is selected accordingly.

	[BZ #23961]
	* math/auto-libm-test-in: Add new test case.
	* math/auto-libm-test-out-pow: Regenerated.
	* sysdeps/ieee754/flt-32/e_powf.c (__powf): Fix overflow check.
 		2018-12-11 10:01:43 +00:00
..
e_acosf.c Rename all __ieee754_sqrt(f/l) calls to sqrt(f/l) 2018-03-15 19:21:36 +00:00
e_acoshf.c Rename all __ieee754_sqrt(f/l) calls to sqrt(f/l) 2018-03-15 19:21:36 +00:00
e_asinf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
e_atan2f.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_atanhf.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
e_coshf.c Move math_narrow_eval to separate math-narrow-eval.h. 2018-05-09 00:15:10 +00:00
e_exp2f.c Move math_narrow_eval to separate math-narrow-eval.h. 2018-05-09 00:15:10 +00:00
e_exp2f_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_expf.c Clean up converttoint handling and document the semantics 2018-08-10 17:23:16 +01:00
e_fmodf.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_gammaf_r.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
e_hypotf.c Rename all __ieee754_sqrt(f/l) calls to sqrt(f/l) 2018-03-15 19:21:36 +00:00
e_ilogbf.c
…
e_j0f.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
e_j1f.c Do not include fenv_private.h in math_private.h. 2018-09-03 21:09:04 +00:00
e_jnf.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
e_lgammaf_r.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
e_log2f.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_log2f_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_log10f.c Use fabs(f/l) rather than __fabs 2017-09-29 18:54:24 +01:00
e_logf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_logf_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_powf.c Fix powf overflow handling in non-nearest rounding mode [BZ #23961] 2018-12-11 10:01:43 +00:00
e_powf_log2_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_remainderf.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
e_sinhf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
e_sqrtf.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
k_tanf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
lgamma_negf.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
lgamma_productf.c Fix lgamma (negative) inaccuracy (bug 2542, bug 2543, bug 2558). 2015-09-10 22:27:58 +00:00
math_config.h Clean up converttoint handling and document the semantics 2018-08-10 17:23:16 +01:00
math_errf.c Use uint32_t sign in single precision math error handling functions 2018-07-02 09:29:04 +01:00
mpn2flt.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_asinhf.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
s_atanf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_cbrtf.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_ceilf.c Use ceil functions not __ceil functions in glibc libm. 2018-09-17 20:42:06 +00:00
s_copysignf.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
s_cosf.c Improve performance of sinf and cosf 2018-08-14 10:45:59 +01:00
s_erff.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_expm1f.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
s_fabsf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_finitef.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
s_floorf.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
s_fpclassifyf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_frexpf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_fromfpf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_fromfpf_main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fromfpxf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_getpayloadf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_isinff.c
…
s_isnanf.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +00:00
s_issignalingf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_llrintf.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_llroundf.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_log1pf.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
s_logbf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_lrintf.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_lroundf.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_modff.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_nearbyintf.c Do not include fenv_private.h in math_private.h. 2018-09-03 21:09:04 +00:00
s_nextafterf.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
s_nextupf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_remquof.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_rintf.c Use rint functions not __rint functions in glibc libm. 2018-09-14 13:10:39 +00:00
s_roundevenf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_roundf.c Use round functions not __round functions in glibc libm. 2018-09-27 12:35:23 +00:00
s_scalblnf.c [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
s_scalbnf.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
s_setpayloadf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_setpayloadf_main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_setpayloadsigf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_signbitf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_sincosf.c Improve performance of sincosf 2018-08-10 17:34:39 +01:00
s_sincosf.h Improve performance of sinf and cosf 2018-08-14 10:45:59 +01:00
s_sincosf_data.c Improve performance of sincosf 2018-08-10 17:34:39 +01:00
s_sinf.c Improve performance of sinf and cosf 2018-08-14 10:45:59 +01:00
s_tanf.c Speedup tanf range reduction 2018-08-23 12:38:16 +01:00
s_tanhf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_totalorderf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_totalordermagf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_truncf.c Use trunc functions not __trunc functions in glibc libm. 2018-09-20 21:11:10 +00:00
s_ufromfpf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_ufromfpxf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
w_exp2f.c Do not wrap expf and exp2f 2017-10-02 14:38:54 +01:00
w_expf.c Do not wrap expf and exp2f 2017-10-02 14:38:54 +01:00
w_log2f.c Do not wrap logf, log2f and powf 2017-10-02 14:39:38 +01:00
w_logf.c Do not wrap logf, log2f and powf 2017-10-02 14:39:38 +01:00
w_powf.c Do not wrap logf, log2f and powf 2017-10-02 14:39:38 +01:00