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

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Clang supports __builtin_fabsf128 (despite not supporting _Float128) but
_not _builtin_fabsq.
By falling back to `typedef __float128 _Float128;`, the float128 code
will be buildable with Clang.
This commit is contained in:
Fangrui Song 2021-10-10 14:38:00 -07:00 committed by Pranav Kant
parent bade6276d1
commit 2676793257
1 changed files with 11 additions and 8 deletions
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19
sysdeps/x86/bits/floatn.h
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@ -32,7 +32,8 @@
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))) \
|| defined __clang__
# define __HAVE_FLOAT128 1
#else
# define __HAVE_FLOAT128 0
@ -67,7 +68,8 @@ capture(i_have_distinct_float128, __HAVE_DISTINCT_FLOAT128);
/* 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
# if !__GNUC_PREREQ (7, 0) || defined __cplusplus \
|| defined __clang__
/* The literal suffix f128 exists only since GCC 7.0. */
# define __f128(x) x##q
# else
@ -77,7 +79,8 @@ capture(i_have_distinct_float128, __HAVE_DISTINCT_FLOAT128);
/* Defined to a complex binary128 type if __HAVE_FLOAT128 is 1. */
# if __HAVE_FLOAT128
# if !__GNUC_PREREQ (7, 0) || defined __cplusplus
# if !__GNUC_PREREQ (7, 0) || defined __cplusplus \
|| defined __clang__
/* Add a typedef for older GCC compilers which don't natively support
_Complex _Float128. */
typedef _Complex float __cfloat128 __attribute__ ((__mode__ (__TC__)));
@ -91,8 +94,8 @@ 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
/* need a clang 5.0 case here? */
# if !__GNUC_PREREQ (7, 0) || defined __cplusplus \
|| defined __clang__
typedef __float128 _Float128;
# endif
@ -112,7 +115,7 @@ typedef __float128 _Float128;
#else /* GCC */
/* __builtin_huge_valf128 doesn't exist before GCC 7.0. */
# if !__GNUC_PREREQ (7, 0)
# if !__GNUC_PREREQ (7, 0) && !defined __clang__
# define __builtin_huge_valf128() ((_Float128) __builtin_huge_val ())
# endif
@ -121,7 +124,7 @@ 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 ())
@ -133,7 +136,7 @@ typedef __float128 _Float128;
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. */
# if !__GNUC_PREREQ (6, 0)
# if !__GNUC_PREREQ (6, 0) && !defined __clang__
# define __builtin_signbitf128 __signbitf128
# endif