Support usable check for all CPU features with the following changes:
1. Change struct cpu_features to
struct cpuid_features
{
struct cpuid_registers cpuid;
struct cpuid_registers usable;
};
struct cpu_features
{
struct cpu_features_basic basic;
struct cpuid_features features[COMMON_CPUID_INDEX_MAX];
unsigned int preferred[PREFERRED_FEATURE_INDEX_MAX];
...
};
so that there is a usable bit for each cpuid bit.
2. After the cpuid bits have been initialized, copy the known bits to the
usable bits. EAX/EBX from INDEX_1 and EAX from INDEX_7 aren't used for
CPU feature detection.
3. Clear the usable bits which require OS support.
4. If the feature is supported by OS, copy its cpuid bit to its usable
bit.
5. Replace HAS_CPU_FEATURE and CPU_FEATURES_CPU_P with CPU_FEATURE_USABLE
and CPU_FEATURE_USABLE_P to check if a feature is usable.
6. Add DEPR_FPU_CS_DS for INDEX_7_EBX_13.
7. Unset MPX feature since it has been deprecated.
The results are
1. If the feature is known and doesn't requre OS support, its usable bit
is copied from the cpuid bit.
2. Otherwise, its usable bit is copied from the cpuid bit only if the
feature is known to supported by OS.
3. CPU_FEATURE_USABLE/CPU_FEATURE_USABLE_P are used to check if the
feature can be used.
4. HAS_CPU_FEATURE/CPU_FEATURE_CPU_P are used to check if CPU supports
the feature.
Continuing the preparation for additional _FloatN / _FloatNx function
aliases, this patch makes i386 libm function implementations use
libm_alias_float (or libm_alias_float_other in cases where the main
symbol name is defined with versioned_symbol) to define function
aliases.
Tested with build-many-glibcs.py for all its i386 configurations that
installed stripped shared libraries are unchanged by the patch, as
well as running the full glibc testsuite for i686.
* sysdeps/i386/fpu/s_asinhf.S: Include <libm-alias-float.h>.
(asinhf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_atanf.S: Include <libm-alias-float.h>.
(atanf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_cbrtf.S: Include <libm-alias-float.h>.
(cbrtf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_ceilf.S: Include <libm-alias-float.h>.
(ceilf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_copysignf.S: Include <libm-alias-float.h>.
(copysignf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_expm1f.S: Include <libm-alias-float.h>.
(expm1f): Define using libm_alias_float.
* sysdeps/i386/fpu/s_fabsf.S: Include <libm-alias-float.h>.
(fabsf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_floorf.S: Include <libm-alias-float.h>.
(floorf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_fmaxf.S: Include <libm-alias-float.h>.
(fmaxf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_fminf.S: Include <libm-alias-float.h>.
(fminf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_frexpf.S: Include <libm-alias-float.h>.
(frexpf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_llrintf.S: Include <libm-alias-float.h>.
(llrintf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_logbf.S: Include <libm-alias-float.h>.
(logbf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_lrintf.S: Include <libm-alias-float.h>.
(lrintf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_nearbyintf.S: Include <libm-alias-float.h>.
(nearbyintf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_remquof.S: Include <libm-alias-float.h>.
(remquof): Define using libm_alias_float.
* sysdeps/i386/fpu/s_rintf.S: Include <libm-alias-float.h>.
(rintf): Define using libm_alias_float.
* sysdeps/i386/fpu/s_truncf.S: Include <libm-alias-float.h>.
(truncf): Define using libm_alias_float.
* sysdeps/i386/i686/fpu/multiarch/e_exp2f.c: Include
<libm-alias-float.h>.
(exp2f): Define using libm_alias_float, or libm_alias_float_other
if [SHARED].
* sysdeps/i386/i686/fpu/multiarch/e_expf.c: Include
<libm-alias-float.h>.
(expf): Define using libm_alias_float, or libm_alias_float_other
if [SHARED].
* sysdeps/i386/i686/fpu/multiarch/e_log2f.c: Include
<libm-alias-float.h>.
(log2f): Define using libm_alias_float, or libm_alias_float_other
if [SHARED].
* sysdeps/i386/i686/fpu/multiarch/e_logf.c: Include
<libm-alias-float.h>.
(logf): Define using libm_alias_float, or libm_alias_float_other
if [SHARED].
* sysdeps/i386/i686/fpu/multiarch/e_powf.c: Include
<libm-alias-float.h>.
(powf): Define using libm_alias_float, or libm_alias_float_other
if [SHARED].
* sysdeps/i386/i686/fpu/multiarch/s_cosf.c: Include
<libm-alias-float.h>.
(cosf): Define using libm_alias_float.
* sysdeps/i386/i686/fpu/multiarch/s_sincosf.c: Include
<libm-alias-float.h>.
(sincosf): Define using libm_alias_float.
* sysdeps/i386/i686/fpu/multiarch/s_sinf.c: Include
<libm-alias-float.h>.
(sinf): Define using libm_alias_float.
* sysdeps/i386/i686/fpu/s_fmaxf.S: Include <libm-alias-float.h>.
(fmaxf): Define using libm_alias_float.
* sysdeps/i386/i686/fpu/s_fminf.S: Include <libm-alias-float.h>.
(fminf): Define using libm_alias_float.
* sysdeps/i386/i686/multiarch/s_fmaf.c: Include
<libm-alias-float.h>.
(fmaf): Define using libm_alias_float.
