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/* Inline floating-point environment handling functions for powerpc.
Copyright (C) 1995-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#if defined __GNUC__ && !defined _SOFT_FLOAT && !defined __NO_FPRS__
/* Inline definitions for fegetround. */
# define __fegetround_ISA300() \
(__extension__ ({ \
union { double __d; unsigned long long __ll; } __u; \
__asm__ __volatile__ ( \
".machine push; .machine \"power9\"; mffsl %0; .machine pop" \
: "=f" (__u.__d)); \
__u.__ll & 0x0000000000000003LL; \
}))
# define __fegetround_ISA2() \
(__extension__ ({ \
int __fegetround_result; \
__asm__ __volatile__ ("mcrfs 7,7 ; mfcr %0" \
: "=r"(__fegetround_result) : : "cr7"); \
__fegetround_result & 3; \
}))
# ifdef _ARCH_PWR9
# define __fegetround() __fegetround_ISA300()
# elif defined __BUILTIN_CPU_SUPPORTS__
# define __fegetround() \
(__glibc_likely (__builtin_cpu_supports ("arch_3_00")) \
? __fegetround_ISA300() \
: __fegetround_ISA2() \
)
# else
# define __fegetround() __fegetround_ISA2()
# endif
# define fegetround() __fegetround ()
# ifndef __NO_MATH_INLINES
/* Builtins to mtfsb0 and mtfsb1 was introduced on GCC 9. */
# if !__GNUC_PREREQ(9, 0)
/* The weird 'i#*X' constraints on the following suppress a gcc
warning when __excepts is not a constant. Otherwise, they mean the
same as just plain 'i'. This warning only happens in old GCC
versions (gcc 3 or less). Otherwise plain 'i' works fine. */
# define __MTFSB0(__b) __asm__ __volatile__ ("mtfsb0 %0" : : "i#*X" (__b))
# define __MTFSB1(__b) __asm__ __volatile__ ("mtfsb1 %0" : : "i#*X" (__b))
# else
# define __MTFSB0(__b) __builtin_mtfsb0 (__b)
# define __MTFSB1(__b) __builtin_mtfsb1 (__b)
# endif
# if __GNUC_PREREQ(3, 4)
#include <sys/param.h>
/* Inline definition for feraiseexcept. */
# define feraiseexcept(__excepts) \
(__extension__ ({ \
int __e = __excepts; \
int __ret = 0; \
if (__builtin_constant_p (__e) \
&& powerof2 (__e) \
&& __e != FE_INVALID) \
{ \
__MTFSB1 ((__builtin_clz (__e))); \
} \
else \
__ret = feraiseexcept (__e); \
__ret; \
}))
/* Inline definition for feclearexcept. */
# define feclearexcept(__excepts) \
(__extension__ ({ \
int __e = __excepts; \
int __ret = 0; \
if (__builtin_constant_p (__e) \
&& powerof2 (__e) \
&& __e != FE_INVALID) \
{ \
__MTFSB0 ((__builtin_clz (__e))); \
} \
else \
__ret = feclearexcept (__e); \
__ret; \
}))
# endif /* __GNUC_PREREQ(3, 4). */
# endif /* !__NO_MATH_INLINES. */
#endif /* __GNUC__ && !_SOFT_FLOAT && !__NO_FPRS__ */
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