AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-26 15:00:06 +00:00
Code Issues Packages Projects Releases Wiki Activity
43cfdf8f48
glibc/sysdeps/ieee754/flt-32
History
Szabolcs Nagy 43cfdf8f48 Clean up converttoint handling and document the semantics 
This patch currently only affects aarch64.

The roundtoint and converttoint internal functions are only called with small
values, so 32 bit result is enough for converttoint and it is a signed int
conversion so the return type is changed to int32_t.

The original idea was to help the compiler keeping the result in uint64_t,
then it's clear that no sign extension is needed and there is no accidental
undefined or implementation defined signed int arithmetics.

But it turns out gcc does a good job with inlining so changing the type has
no overhead and the semantics of the conversion is less surprising this way.
Since we want to allow the asuint64 (x + 0x1.8p52) style conversion, the top
bits were never usable and the existing code ensures that only the bottom
32 bits of the conversion result are used.

On aarch64 the neon intrinsics (which round ties to even) are changed to
round and lround (which round ties away from zero) this does not affect the
results in a significant way, but more portable (relies on round and lround
being inlined which works with -fno-math-errno).

The TOINT_SHIFT and TOINT_RINT macros were removed, only keep separate code
paths for TOINT_INTRINSICS and !TOINT_INTRINSICS.

	* sysdeps/aarch64/fpu/math_private.h (roundtoint): Use round.
	(converttoint): Use lround.
	* sysdeps/ieee754/flt-32/math_config.h (roundtoint): Declare and
	document the semantics when TOINT_INTRINSICS is set.
	(converttoint): Likewise.
	(TOINT_RINT): Remove.
	(TOINT_SHIFT): Remove.
	* sysdeps/ieee754/flt-32/e_expf.c (__expf): Remove the TOINT_RINT code
	path.
2018-08-10 17:23:16 +01:00
..
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 Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +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_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_exp2f.c Move math_narrow_eval to separate math-narrow-eval.h. 2018-05-09 00:15:10 +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 Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +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 Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
e_jnf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
e_lgammaf_r.c Move math_narrow_eval to separate math-narrow-eval.h. 2018-05-09 00:15:10 +00:00
e_log2f_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_log2f.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_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_logf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_powf_log2_data.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
e_powf.c Use uint32_t sign in single precision math error handling functions 2018-07-02 09:29:04 +01:00
e_rem_pio2f.c Consistently use uintN_t not u_intN_t in libm. 2017-08-03 19:55:04 +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_cosf.c
k_rem_pio2f.c Fix i686-linux-gnu build with GCC mainline. 2018-05-22 16:55:04 +00:00
k_sinf.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +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 Move math_narrow_eval to separate math-narrow-eval.h. 2018-05-09 00:15:10 +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 Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_ceilf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_copysignf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_cosf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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 libm_alias_float in flt-32. 2017-09-22 20:24:12 +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_main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fromfpf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +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 math_narrow_eval to separate math-narrow-eval.h. 2018-05-09 00:15:10 +00:00
s_llroundf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +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 math_narrow_eval to separate math-narrow-eval.h. 2018-05-09 00:15:10 +00:00
s_lroundf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +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 math-barriers.h in math_private.h. 2018-05-11 15:11:38 +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 libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
s_roundevenf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_roundf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_scalblnf.c
s_scalbnf.c Make scalbn set errno (bug 6803). 2015-09-16 21:11:00 +00:00
s_setpayloadf_main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_setpayloadf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_sincosf.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_sinf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_tanf.c Use libm_alias_float in flt-32. 2017-09-22 20:24:12 +00:00
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 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +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