/* Private floating point rounding and exceptions handling. PowerPC version.

   Copyright (C) 2013-2018 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 FENV_PRIVATE_H

#define FENV_PRIVATE_H 1

#include <fenv.h>

#include <fenv_libc.h>

#include <fpu_control.h>

/* Mask for the exception enable bits.  */

#define _FPU_ALL_TRAPS (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM \

                      | _FPU_MASK_XM | _FPU_MASK_IM)

/* Mask the rounding mode bits.  */

#define _FPU_MASK_RN 0xfffffffffffffffcLL

/* Mask everything but the rounding modes and non-IEEE arithmetic flags.  */

#define _FPU_MASK_NOT_RN_NI 0xffffffff00000807LL

/* Mask restore rounding mode and exception enabled.  */

#define _FPU_MASK_TRAPS_RN 0xffffffffffffff00LL

/* Mask FP result flags, preserve fraction rounded/inexact bits.  */

#define _FPU_MASK_FRAC_INEX_RET_CC 0xfffffffffff80fffLL

static __always_inline void

__libc_feholdbits_ppc (fenv_t *envp, unsigned long long mask,

	unsigned long long bits)

{

  fenv_union_t old, new;

  old.fenv = *envp = fegetenv_register ();

  new.l = (old.l & mask) | bits;

  /* If the old env had any enabled exceptions, then mask SIGFPE in the

     MSR FE0/FE1 bits.  This may allow the FPU to run faster because it

     always takes the default action and can not generate SIGFPE.  */

  if ((old.l & _FPU_ALL_TRAPS) != 0)

    (void) __fe_mask_env ();

  fesetenv_register (new.fenv);

}

static __always_inline void

libc_feholdexcept_ppc (fenv_t *envp)

{

  __libc_feholdbits_ppc (envp, _FPU_MASK_NOT_RN_NI, 0LL);

}

static __always_inline void

libc_feholdexcept_setround_ppc (fenv_t *envp, int r)

{

  __libc_feholdbits_ppc (envp, _FPU_MASK_NOT_RN_NI & _FPU_MASK_RN, r);

}

static __always_inline void

libc_fesetround_ppc (int r)

{

  __fesetround_inline (r);

}

static __always_inline int

libc_fetestexcept_ppc (int e)

{

  fenv_union_t u;

  u.fenv = fegetenv_register ();

  return u.l & e;

}

static __always_inline void

libc_feholdsetround_ppc (fenv_t *e, int r)

{

  __libc_feholdbits_ppc (e, _FPU_MASK_TRAPS_RN, r);

}

static __always_inline unsigned long long

__libc_femergeenv_ppc (const fenv_t *envp, unsigned long long old_mask,

	unsigned long long new_mask)

{

  fenv_union_t old, new;

  new.fenv = *envp;

  old.fenv = fegetenv_register ();

  /* Merge bits while masking unwanted bits from new and old env.  */

  new.l = (old.l & old_mask) | (new.l & new_mask);

  /* If the old env has no enabled exceptions and the new env has any enabled

     exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits.  This will put the

     hardware into "precise mode" and may cause the FPU to run slower on some

     hardware.  */

  if ((old.l & _FPU_ALL_TRAPS) == 0 && (new.l & _FPU_ALL_TRAPS) != 0)

    (void) __fe_nomask_env_priv ();

  /* If the old env had any enabled exceptions and the new env has no enabled

     exceptions, then mask SIGFPE in the MSR FE0/FE1 bits.  This may allow the

     FPU to run faster because it always takes the default action and can not

     generate SIGFPE.  */

  if ((old.l & _FPU_ALL_TRAPS) != 0 && (new.l & _FPU_ALL_TRAPS) == 0)

    (void) __fe_mask_env ();

  /* Atomically enable and raise (if appropriate) exceptions set in `new'.  */

  fesetenv_register (new.fenv);

  return old.l;

}

static __always_inline void

libc_fesetenv_ppc (const fenv_t *envp)

{

  /* Replace the entire environment.  */

  __libc_femergeenv_ppc (envp, 0LL, -1LL);

}

static __always_inline void

libc_feresetround_ppc (fenv_t *envp)

{

  fenv_union_t new = { .fenv = *envp };

  fegetenv_and_set_rn (new.l & FPSCR_RN_MASK);

}

static __always_inline int

libc_feupdateenv_test_ppc (fenv_t *envp, int ex)

{

  return __libc_femergeenv_ppc (envp, _FPU_MASK_TRAPS_RN,

				_FPU_MASK_FRAC_INEX_RET_CC) & ex;

}

static __always_inline void

libc_feupdateenv_ppc (fenv_t *e)

{

  libc_feupdateenv_test_ppc (e, 0);

}

#define libc_feholdexceptf           libc_feholdexcept_ppc

#define libc_feholdexcept            libc_feholdexcept_ppc

#define libc_feholdexcept_setroundf  libc_feholdexcept_setround_ppc

#define libc_feholdexcept_setround   libc_feholdexcept_setround_ppc

#define libc_fetestexceptf           libc_fetestexcept_ppc

#define libc_fetestexcept            libc_fetestexcept_ppc

#define libc_fesetroundf             libc_fesetround_ppc

#define libc_fesetround              libc_fesetround_ppc

#define libc_fesetenvf               libc_fesetenv_ppc

#define libc_fesetenv                libc_fesetenv_ppc

#define libc_feupdateenv_testf       libc_feupdateenv_test_ppc

#define libc_feupdateenv_test        libc_feupdateenv_test_ppc

#define libc_feupdateenvf            libc_feupdateenv_ppc

#define libc_feupdateenv             libc_feupdateenv_ppc

#define libc_feholdsetroundf         libc_feholdsetround_ppc

#define libc_feholdsetround          libc_feholdsetround_ppc

#define libc_feresetroundf           libc_feresetround_ppc

#define libc_feresetround            libc_feresetround_ppc

/* We have support for rounding mode context.  */

#define HAVE_RM_CTX 1

static __always_inline void

libc_feholdsetround_ppc_ctx (struct rm_ctx *ctx, int r)

{

  fenv_union_t old;

  ctx->env = old.fenv = fegetenv_and_set_rn (r);

  ctx->updated_status = (r != (old.l & FPSCR_RN_MASK));

}

static __always_inline void

libc_feholdsetround_noex_ppc_ctx (struct rm_ctx *ctx, int r)

{

  fenv_union_t old, new;

  old.fenv = fegetenv_register ();

  new.l = (old.l & ~(FPSCR_ENABLES_MASK|FPSCR_RN_MASK)) | r;

  ctx->env = old.fenv;

  if (__glibc_unlikely (new.l != old.l))

    {

      if ((old.l & _FPU_ALL_TRAPS) != 0)

	(void) __fe_mask_env ();

      fesetenv_register (new.fenv);

      ctx->updated_status = true;

    }

  else

    ctx->updated_status = false;

}

static __always_inline void

libc_fesetenv_ppc_ctx (struct rm_ctx *ctx)

{

  libc_fesetenv_ppc (&ctx->env);

}

static __always_inline void

libc_feupdateenv_ppc_ctx (struct rm_ctx *ctx)

{

  if (__glibc_unlikely (ctx->updated_status))

    libc_feresetround_ppc (&ctx->env);

}

static __always_inline void

libc_feresetround_ppc_ctx (struct rm_ctx *ctx)

{

  if (__glibc_unlikely (ctx->updated_status))

    libc_feresetround_ppc (&ctx->env);

}

#define libc_fesetenv_ctx                libc_fesetenv_ppc_ctx

#define libc_fesetenvf_ctx               libc_fesetenv_ppc_ctx

#define libc_fesetenvl_ctx               libc_fesetenv_ppc_ctx

#define libc_feholdsetround_ctx          libc_feholdsetround_ppc_ctx

#define libc_feholdsetroundf_ctx         libc_feholdsetround_ppc_ctx

#define libc_feholdsetroundl_ctx         libc_feholdsetround_ppc_ctx

#define libc_feholdsetround_noex_ctx     libc_feholdsetround_noex_ppc_ctx

#define libc_feholdsetround_noexf_ctx    libc_feholdsetround_noex_ppc_ctx

#define libc_feholdsetround_noexl_ctx    libc_feholdsetround_noex_ppc_ctx

#define libc_feresetround_ctx            libc_feresetround_ppc_ctx

#define libc_feresetroundf_ctx           libc_feresetround_ppc_ctx

#define libc_feresetroundl_ctx           libc_feresetround_ppc_ctx

#define libc_feupdateenv_ctx             libc_feupdateenv_ppc_ctx

#define libc_feupdateenvf_ctx            libc_feupdateenv_ppc_ctx

#define libc_feupdateenvl_ctx            libc_feupdateenv_ppc_ctx

#endif