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x86: Define __HAVE_FLOAT128 for Clang and use __builtin_*f128 code path 

Clang supports __builtin_fabsf128 (despite not supporting _Float128) but
it does not support __builtin_fabsq.  Fallback to back to
`typedef __float128 _Float128;` it clang is used.

Originally developed by Fangrui Song <maskray@google.com>.
Co-Authored-By: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
Fangrui Song 2021-10-10 14:38:00 -07:00 committed by H.J. Lu
parent b2556550a0
commit d773aff467
1 changed files with 16 additions and 8 deletions
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24
sysdeps/x86/bits/floatn.h
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@ -28,7 +28,8 @@
support, for x86_64 and x86. */
#if (defined __x86_64__ \
? __GNUC_PREREQ (4, 3) \
: (defined __GNU__ ? __GNUC_PREREQ (4, 5) : __GNUC_PREREQ (4, 4)))
: (defined __GNU__ ? __GNUC_PREREQ (4, 5) : __GNUC_PREREQ (4, 4))) \
|| __glibc_clang_prereq (3, 4)
# define __HAVE_FLOAT128 1
#else
# define __HAVE_FLOAT128 0
@ -58,7 +59,9 @@
/* Defined to concatenate the literal suffix to be used with _Float128
types, if __HAVE_FLOAT128 is 1. */
# if __HAVE_FLOAT128
# if !__GNUC_PREREQ (7, 0) || (defined __cplusplus && !__GNUC_PREREQ (13, 0))
# if !__GNUC_PREREQ (7, 0) \
|| (defined __cplusplus && !__GNUC_PREREQ (13, 0)) \
|| defined __clang__
/* The literal suffix f128 exists only since GCC 7.0. */
# define __f128(x) x##q
# else
@ -68,7 +71,9 @@
/* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */
# if __HAVE_FLOAT128
# if !__GNUC_PREREQ (7, 0) || (defined __cplusplus && !__GNUC_PREREQ (13, 0))
# if !__GNUC_PREREQ (7, 0) \
|| (defined __cplusplus && !__GNUC_PREREQ (13, 0)) \
|| defined __clang__
/* Add a typedef for older GCC compilers which don't natively support
_Complex _Float128. */
typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
@ -82,12 +87,14 @@ typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
# if __HAVE_FLOAT128
/* The type _Float128 exists only since GCC 7.0. */
# if !__GNUC_PREREQ (7, 0) || (defined __cplusplus && !__GNUC_PREREQ (13, 0))
# if !__GNUC_PREREQ (7, 0) \
|| (defined __cplusplus && !__GNUC_PREREQ (13, 0)) \
|| __glibc_clang_prereq (3, 4)
typedef __float128 _Float128;
# endif
/* __builtin_huge_valf128 doesn't exist before GCC 7.0. */
# if !__GNUC_PREREQ (7, 0)
/* __builtin_huge_valf128 doesn't exist before GCC 7.0 nor Clang 7.0. */
# if !__GNUC_PREREQ (7, 0) && !__glibc_clang_prereq (7, 0)
# define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ())
# endif
@ -96,7 +103,7 @@ typedef __float128 _Float128;
Converting a narrower sNaN to _Float128 produces a quiet NaN, so
attempts to use _Float128 sNaNs will not work properly with older
compilers. */
# if !__GNUC_PREREQ (7, 0)
# if !__GNUC_PREREQ (7, 0) && !defined __clang__
# define __builtin_copysignf128 __builtin_copysignq
# define __builtin_fabsf128 __builtin_fabsq
# define __builtin_inff128() ((_Float128) __builtin_inf ())
@ -107,7 +114,8 @@ typedef __float128 _Float128;
/* In math/math.h, __MATH_TG will expand signbit to __builtin_signbit*,
e.g.: __builtin_signbitf128, before GCC 6. However, there has never
been a __builtin_signbitf128 in GCC and the type-generic builtin is
only available since GCC 6. */
only available since GCC 6. signbit is expanded to __builtin_signbit
after Clang 3.3. */
# if !__GNUC_PREREQ (6, 0)
# define __builtin_signbitf128 __signbitf128
# endif