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/* Private floating point rounding and exceptions handling. RISC-V version.
Copyright (C) 2014-2021 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 RISCV_FENV_PRIVATE_H
#define RISCV_FENV_PRIVATE_H 1
#include <fenv.h>
#include <fpu_control.h>
#include <get-rounding-mode.h>
static __always_inline int
riscv_getround (void)
{
return get_rounding_mode ();
}
static __always_inline void
riscv_setround (int rm)
{
asm volatile ("fsrm %z0" : : "rJ" (rm));
}
static __always_inline int
riscv_getflags (void)
{
int flags;
asm volatile ("frflags %0" : "=r" (flags));
return flags;
}
static __always_inline void
riscv_setflags (int flags)
{
asm volatile ("fsflags %z0" : : "rJ" (flags));
}
static __always_inline void
libc_feholdexcept_riscv (fenv_t *envp)
{
asm volatile ("csrrc %0, fcsr, %1" : "=r" (*envp) : "i" (FE_ALL_EXCEPT));
}
#define libc_feholdexcept libc_feholdexcept_riscv
#define libc_feholdexceptf libc_feholdexcept_riscv
#define libc_feholdexceptl libc_feholdexcept_riscv
static __always_inline void
libc_fesetround_riscv (int round)
{
riscv_setround (round);
}
#define libc_fesetround libc_fesetround_riscv
#define libc_fesetroundf libc_fesetround_riscv
#define libc_fesetroundl libc_fesetround_riscv
static __always_inline void
libc_feholdexcept_setround_riscv (fenv_t *envp, int round)
{
libc_feholdexcept_riscv (envp);
libc_fesetround_riscv (round);
}
#define libc_feholdexcept_setround libc_feholdexcept_setround_riscv
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_riscv
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_riscv
static __always_inline int
libc_fetestexcept_riscv (int ex)
{
return riscv_getflags () & ex;
}
#define libc_fetestexcept libc_fetestexcept_riscv
#define libc_fetestexceptf libc_fetestexcept_riscv
#define libc_fetestexceptl libc_fetestexcept_riscv
static __always_inline void
libc_fesetenv_riscv (const fenv_t *envp)
{
long int env = (long int) envp - (long int) FE_DFL_ENV;
if (env != 0)
env = *envp;
_FPU_SETCW (env);
}
#define libc_fesetenv libc_fesetenv_riscv
#define libc_fesetenvf libc_fesetenv_riscv
#define libc_fesetenvl libc_fesetenv_riscv
#define libc_feresetround_noex libc_fesetenv_riscv
#define libc_feresetround_noexf libc_fesetenv_riscv
#define libc_feresetround_noexl libc_fesetenv_riscv
static __always_inline int
libc_feupdateenv_test_riscv (const fenv_t *envp, int ex)
{
fenv_t env = *envp;
int flags = riscv_getflags ();
asm volatile ("csrw fcsr, %z0" : : "rJ" (env | flags));
return flags & ex;
}
#define libc_feupdateenv_test libc_feupdateenv_test_riscv
#define libc_feupdateenv_testf libc_feupdateenv_test_riscv
#define libc_feupdateenv_testl libc_feupdateenv_test_riscv
static __always_inline void
libc_feupdateenv_riscv (const fenv_t *envp)
{
_FPU_SETCW (*envp | riscv_getflags ());
}
#define libc_feupdateenv libc_feupdateenv_riscv
#define libc_feupdateenvf libc_feupdateenv_riscv
#define libc_feupdateenvl libc_feupdateenv_riscv
static __always_inline void
libc_feholdsetround_riscv (fenv_t *envp, int round)
{
/* Note this implementation makes an improperly-formatted fenv_t and
so should only be used in conjunction with libc_feresetround. */
int old_round;
asm volatile ("csrrw %0, frm, %z1" : "=r" (old_round) : "rJ" (round));
*envp = old_round;
}
#define libc_feholdsetround libc_feholdsetround_riscv
#define libc_feholdsetroundf libc_feholdsetround_riscv
#define libc_feholdsetroundl libc_feholdsetround_riscv
static __always_inline void
libc_feresetround_riscv (fenv_t *envp)
{
/* Note this implementation takes an improperly-formatted fenv_t and
so should only be used in conjunction with libc_feholdsetround. */
riscv_setround (*envp);
}
#define libc_feresetround libc_feresetround_riscv
#define libc_feresetroundf libc_feresetround_riscv
#define libc_feresetroundl libc_feresetround_riscv
#include_next <fenv_private.h>
#endif
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