/* FPU control word definitions.  PowerPC version.

   Copyright (C) 1996-2018 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

   <http://www.gnu.org/licenses/>.  */

#ifndef _FPU_CONTROL_H

#define _FPU_CONTROL_H

#ifdef _SOFT_FLOAT

# define _FPU_RESERVED 0xffffffff

# define _FPU_DEFAULT  0x00000000 /* Default value.  */

typedef unsigned int fpu_control_t;

# define _FPU_GETCW(cw) (cw) = 0

# define _FPU_SETCW(cw) (void) (cw)

extern fpu_control_t __fpu_control;

#elif defined __NO_FPRS__ /* e500 */

/* rounding control */

# define _FPU_RC_NEAREST 0x00   /* RECOMMENDED */

# define _FPU_RC_DOWN    0x03

# define _FPU_RC_UP      0x02

# define _FPU_RC_ZERO    0x01

/* masking of interrupts */

# define _FPU_MASK_ZM  0x10 /* zero divide */

# define _FPU_MASK_OM  0x04 /* overflow */

# define _FPU_MASK_UM  0x08 /* underflow */

# define _FPU_MASK_XM  0x40 /* inexact */

# define _FPU_MASK_IM  0x20 /* invalid operation */

# define _FPU_RESERVED 0x00c10080 /* These bits are reserved and not changed. */

/* Correct IEEE semantics require traps to be enabled at the hardware

   level; the kernel then does the emulation and determines whether

   generation of signals from those traps was enabled using prctl.  */

# define _FPU_DEFAULT  0x0000003c /* Default value.  */

# define _FPU_IEEE     _FPU_DEFAULT

/* Type of the control word.  */

typedef unsigned int fpu_control_t;

/* Macros for accessing the hardware control word.  */

# define _FPU_GETCW(cw) \

  __asm__ volatile ("mfspefscr %0" : "=r" (cw))

# define _FPU_SETCW(cw) \

  __asm__ volatile ("mtspefscr %0" : : "r" (cw))

/* Default control word set at startup.  */

extern fpu_control_t __fpu_control;

#else /* PowerPC 6xx floating-point.  */

/* rounding control */

# define _FPU_RC_NEAREST 0x00   /* RECOMMENDED */

# define _FPU_RC_DOWN    0x03

# define _FPU_RC_UP      0x02

# define _FPU_RC_ZERO    0x01

# define _FPU_MASK_RC (_FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO)

# define _FPU_MASK_NI  0x04 /* non-ieee mode */

/* masking of interrupts */

# define _FPU_MASK_ZM  0x10 /* zero divide */

# define _FPU_MASK_OM  0x40 /* overflow */

# define _FPU_MASK_UM  0x20 /* underflow */

# define _FPU_MASK_XM  0x08 /* inexact */

# define _FPU_MASK_IM  0x80 /* invalid operation */

# define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */

/* The fdlibm code requires no interrupts for exceptions.  */

# define _FPU_DEFAULT  0x00000000 /* Default value.  */

/* IEEE:  same as above, but (some) exceptions;

   we leave the 'inexact' exception off.

 */

# define _FPU_IEEE     0x000000f0

/* Type of the control word.  */

typedef unsigned int fpu_control_t;

/* Macros for accessing the hardware control word.  */

# define _FPU_GETCW(cw)						\

  ({union { double __d; unsigned long long __ll; } __u;		\

    __asm__ __volatile__("mffs %0" : "=f" (__u.__d));		\

    (cw) = (fpu_control_t) __u.__ll;				\

    (fpu_control_t) __u.__ll;					\

  })

# define _FPU_GET_RC_ISA300()						\

  ({union { double __d; unsigned long long __ll; } __u;			\

    __asm__ __volatile__(						\

      ".machine push; .machine \"power9\"; mffsl %0; .machine pop" 	\

      : "=f" (__u.__d));						\

    (fpu_control_t) (__u.__ll & _FPU_MASK_RC);				\

  })

# ifdef _ARCH_PWR9

#  define _FPU_GET_RC() _FPU_GET_RC_ISA300()

# elif defined __BUILTIN_CPU_SUPPORTS__

#  define _FPU_GET_RC()							\

  ({fpu_control_t __rc;							\

    __rc = __glibc_likely (__builtin_cpu_supports ("arch_3_00"))	\

      ? _FPU_GET_RC_ISA300 ()						\

      : _FPU_GETCW (__rc) & _FPU_MASK_RC;				\

    __rc;								\

  })

# else

#  define _FPU_GET_RC()						\

  ({fpu_control_t __rc = _FPU_GETCW (__rc) & _FPU_MASK_RC;	\

    __rc;							\

  })

# endif

# define _FPU_SETCW(cw)						\

  { union { double __d; unsigned long long __ll; } __u;		\

    register double __fr;					\

    __u.__ll = 0xfff80000LL << 32; /* This is a QNaN.  */	\

    __u.__ll |= (cw) & 0xffffffffLL;				\

    __fr = __u.__d;						\

    __asm__ __volatile__("mtfsf 255,%0" : : "f" (__fr));	\

  }

/* Default control word set at startup.  */

extern fpu_control_t __fpu_control;

#endif /* PowerPC 6xx floating-point.  */

#endif /* _FPU_CONTROL_H */