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/* Private floating point rounding and exceptions handling. C-SKY version.
Copyright (C) 2018-2025 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/>. */
#ifndef CSKY_FENV_PRIVATE_H
#define CSKY_FENV_PRIVATE_H 1
#include <fenv.h>
#include <fpu_control.h>
#include <fenv_libc.h>
static __always_inline void
libc_feholdexcept_vfp (fenv_t *envp)
{
fpu_control_t fpsr, fpcr;
_FPU_GETCW (fpcr);
envp->__fpcr = fpcr;
_FPU_GETFPSR (fpsr);
envp->__fpsr = fpsr;
/* Now set all exceptions to non-stop. */
fpcr &= ~FE_ALL_EXCEPT;
/* And clear all exception flags. */
fpsr &= ~(FE_ALL_EXCEPT << CAUSE_SHIFT);
_FPU_SETFPSR (fpsr);
_FPU_SETCW (fpcr);
}
static __always_inline void
libc_fesetround_vfp (int round)
{
fpu_control_t fpcr;
_FPU_GETCW (fpcr);
/* Set new rounding mode if different. */
if (__glibc_unlikely ((fpcr & FE_DOWNWARD) != round))
_FPU_SETCW ((fpcr & ~FE_DOWNWARD) | round);
}
static __always_inline void
libc_feholdexcept_setround_vfp (fenv_t *envp, int round)
{
fpu_control_t fpsr, fpcr;
_FPU_GETCW (fpcr);
envp->__fpcr = fpcr;
_FPU_GETFPSR (fpsr);
envp->__fpsr = fpsr;
/* Clear exception flags, set all exceptions to non-stop,
and set new rounding mode. */
fpsr &= ~(FE_ALL_EXCEPT << CAUSE_SHIFT);
_FPU_SETFPSR (fpsr);
fpcr &= ~(FE_ALL_EXCEPT | FE_DOWNWARD);
_FPU_SETCW (fpcr | round);
}
static __always_inline void
libc_feholdsetround_vfp (fenv_t *envp, int round)
{
fpu_control_t fpcr;
_FPU_GETCW (fpcr);
envp->__fpcr = fpcr;
/* Set new rounding mode if different. */
if (__glibc_unlikely ((fpcr & FE_DOWNWARD) != round))
_FPU_SETCW ((fpcr & ~FE_DOWNWARD) | round);
}
static __always_inline void
libc_feresetround_vfp (fenv_t *envp)
{
fpu_control_t fpcr, round;
_FPU_GETCW (fpcr);
/* Check whether rounding modes are different. */
round = (envp->__fpcr ^ fpcr) & FE_DOWNWARD;
/* Restore the rounding mode if it was changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
static __always_inline int
libc_fetestexcept_vfp (int ex)
{
fpu_control_t fpsr;
_FPU_GETFPSR (fpsr);
fpsr = fpsr >> CAUSE_SHIFT;
return fpsr & ex & FE_ALL_EXCEPT;
}
static __always_inline void
libc_fesetenv_vfp (const fenv_t *envp)
{
fpu_control_t fpcr, fpsr, new_fpcr, new_fpsr;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
new_fpcr = envp->__fpcr;
new_fpsr = envp->__fpsr;
if (__glibc_unlikely (fpsr ^ new_fpsr) != 0)
_FPU_SETFPSR (new_fpsr);
if (__glibc_unlikely (fpcr ^ new_fpcr) != 0)
_FPU_SETCW (new_fpcr);
}
static __always_inline int
libc_feupdateenv_test_vfp (const fenv_t *envp, int ex)
{
fpu_control_t fpcr, fpsr, new_fpcr, new_fpsr, excepts;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
/* Merge current exception flags with the saved fenv. */
excepts = (fpsr >> CAUSE_SHIFT) & FE_ALL_EXCEPT;
new_fpcr = envp->__fpcr;
new_fpsr = envp->__fpsr | (excepts << CAUSE_SHIFT);
/* Write FCR and FESR if different. */
if (__glibc_unlikely (fpsr ^ new_fpsr) != 0)
_FPU_SETFPSR (new_fpsr);
if (__glibc_unlikely (fpcr ^ new_fpcr) != 0)
_FPU_SETCW (new_fpcr);
/* Raise the exceptions if enabled in the new FP state. */
if (__glibc_unlikely (excepts & new_fpcr))
__feraiseexcept (excepts);
return excepts & ex;
}
static __always_inline void
libc_feupdateenv_vfp (const fenv_t *envp)
{
libc_feupdateenv_test_vfp (envp, 0);
}
static __always_inline void
libc_feholdsetround_vfp_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpcr, fpsr, round;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
ctx->updated_status = false;
ctx->env.__fpcr = fpcr;
ctx->env.__fpsr = fpsr;
/* Check whether rounding modes are different. */
round = (fpcr ^ r) & FE_DOWNWARD;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != 0))
{
ctx->updated_status = true;
_FPU_SETCW (fpcr ^ 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 fpcr;
_FPU_GETCW (fpcr);
fpcr = (fpcr & ~FE_DOWNWARD) | (ctx->env.__fpcr & FE_DOWNWARD);
_FPU_SETCW (fpcr);
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