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/* Private floating point rounding and exceptions handling. ARM VFP version.
Copyright (C) 2014 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 <fpu_control.h>
#ifndef __SOFTFP__
static __always_inline void
libc_feholdexcept_vfp (fenv_t *envp)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
envp->__cw = fpscr;
/* Clear exception flags and set all exceptions to non-stop. */
fpscr &= ~_FPU_MASK_EXCEPT;
_FPU_SETCW (fpscr);
}
static __always_inline void
libc_fesetround_vfp (int round)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
/* Set new rounding mode if different. */
if (__glibc_unlikely ((fpscr & FE_TOWARDZERO) != round))
_FPU_SETCW ((fpscr & ~FE_TOWARDZERO) | round);
}
static __always_inline void
libc_feholdexcept_setround_vfp (fenv_t *envp, int round)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
envp->__cw = fpscr;
/* Clear exception flags, set all exceptions to non-stop,
and set new rounding mode. */
fpscr &= ~(_FPU_MASK_EXCEPT | FE_TOWARDZERO);
_FPU_SETCW (fpscr | round);
}
static __always_inline void
libc_feholdsetround_vfp (fenv_t *envp, int round)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
envp->__cw = fpscr;
/* Set new rounding mode if different. */
if (__glibc_unlikely ((fpscr & FE_TOWARDZERO) != round))
_FPU_SETCW ((fpscr & ~FE_TOWARDZERO) | round);
}
static __always_inline void
libc_feresetround_vfp (fenv_t *envp)
{
fpu_control_t fpscr, round;
_FPU_GETCW (fpscr);
/* Check whether rounding modes are different. */
round = (envp->__cw ^ fpscr) & FE_TOWARDZERO;
/* Restore the rounding mode if it was changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpscr ^ round);
}
static __always_inline int
libc_fetestexcept_vfp (int ex)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
return fpscr & ex & FE_ALL_EXCEPT;
}
static __always_inline void
libc_fesetenv_vfp (const fenv_t *envp)
{
fpu_control_t fpscr, new_fpscr;
_FPU_GETCW (fpscr);
new_fpscr = envp->__cw;
/* Write new FPSCR if different (ignoring NZCV flags). */
if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
_FPU_SETCW (new_fpscr);
}
static __always_inline int
libc_feupdateenv_test_vfp (const fenv_t *envp, int ex)
{
fpu_control_t fpscr, new_fpscr;
int excepts;
_FPU_GETCW (fpscr);
/* Merge current exception flags with the saved fenv. */
excepts = fpscr & FE_ALL_EXCEPT;
new_fpscr = envp->__cw | excepts;
/* Write new FPSCR if different (ignoring NZCV flags). */
if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
_FPU_SETCW (new_fpscr);
/* Raise the exceptions if enabled in the new FP state. */
if (__glibc_unlikely (excepts & (new_fpscr >> FE_EXCEPT_SHIFT)))
feraiseexcept (excepts);
return excepts & ex;
}
static __always_inline void
libc_feupdateenv_vfp (const fenv_t *envp)
{
libc_feupdateenv_test_vfp (envp, 0);
}
#define libc_feholdexcept libc_feholdexcept_vfp
#define libc_feholdexceptf libc_feholdexcept_vfp
#define libc_feholdexceptl libc_feholdexcept_vfp
#define libc_fesetround libc_fesetround_vfp
#define libc_fesetroundf libc_fesetround_vfp
#define libc_fesetroundl libc_fesetround_vfp
#define libc_feresetround libc_feresetround_vfp
#define libc_feresetroundf libc_feresetround_vfp
#define libc_feresetroundl libc_feresetround_vfp
#define libc_feresetround_noex libc_fesetenv_vfp
#define libc_feresetround_noexf libc_fesetenv_vfp
#define libc_feresetround_noexl libc_fesetenv_vfp
#define libc_feholdexcept_setround libc_feholdexcept_setround_vfp
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_vfp
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_vfp
#define libc_feholdsetround libc_feholdsetround_vfp
#define libc_feholdsetroundf libc_feholdsetround_vfp
#define libc_feholdsetroundl libc_feholdsetround_vfp
#define libc_fetestexcept libc_fetestexcept_vfp
#define libc_fetestexceptf libc_fetestexcept_vfp
#define libc_fetestexceptl libc_fetestexcept_vfp
#define libc_fesetenv libc_fesetenv_vfp
#define libc_fesetenvf libc_fesetenv_vfp
#define libc_fesetenvl libc_fesetenv_vfp
#define libc_feupdateenv libc_feupdateenv_vfp
#define libc_feupdateenvf libc_feupdateenv_vfp
#define libc_feupdateenvl libc_feupdateenv_vfp
#define libc_feupdateenv_test libc_feupdateenv_test_vfp
#define libc_feupdateenv_testf libc_feupdateenv_test_vfp
#define libc_feupdateenv_testl libc_feupdateenv_test_vfp
/* We have support for rounding mode context. */
#define HAVE_RM_CTX 1
static __always_inline void
libc_feholdsetround_vfp_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpscr, round;
_FPU_GETCW (fpscr);
ctx->updated_status = false;
ctx->env.__cw = fpscr;
/* Check whether rounding modes are different. */
round = (fpscr ^ r) & FE_TOWARDZERO;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != 0))
{
ctx->updated_status = true;
_FPU_SETCW (fpscr ^ round);
}
}
static __always_inline void
libc_feresetround_vfp_ctx (struct rm_ctx *ctx)
{
/* Restore the rounding mode if updated. */
if (__glibc_unlikely (ctx->updated_status))
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
fpscr = (fpscr & ~FE_TOWARDZERO) | (ctx->env.__cw & FE_TOWARDZERO);
_FPU_SETCW (fpscr);
}
}
static __always_inline void
libc_fesetenv_vfp_ctx (struct rm_ctx *ctx)
{
fpu_control_t fpscr, new_fpscr;
_FPU_GETCW (fpscr);
new_fpscr = ctx->env.__cw;
/* Write new FPSCR if different (ignoring NZCV flags). */
if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
_FPU_SETCW (new_fpscr);
}
#define libc_feholdsetround_ctx libc_feholdsetround_vfp_ctx
#define libc_feresetround_ctx libc_feresetround_vfp_ctx
#define libc_feresetround_noex_ctx libc_fesetenv_vfp_ctx
#define libc_feholdsetroundf_ctx libc_feholdsetround_vfp_ctx
#define libc_feresetroundf_ctx libc_feresetround_vfp_ctx
#define libc_feresetround_noexf_ctx libc_fesetenv_vfp_ctx
#define libc_feholdsetroundl_ctx libc_feholdsetround_vfp_ctx
#define libc_feresetroundl_ctx libc_feresetround_vfp_ctx
#define libc_feresetround_noexl_ctx libc_fesetenv_vfp_ctx
#endif
#endif /* FENV_PRIVATE_H */
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