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/* Internal math stuff.
Copyright (C) 2022-2024 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 LOONGARCH_MATH_PRIVATE_H
#define LOONGARCH_MATH_PRIVATE_H 1
/* Inline functions to speed up the math library implementation. The
default versions of these routines are in generic/math_private.h
and call fesetround, feholdexcept, etc. These routines use inlined
code instead. */
#ifdef __loongarch_hard_float
#include <fenv.h>
#include <fenv_libc.h>
#include <fpu_control.h>
#define _FPU_MASK_ALL \
(_FPU_MASK_V | _FPU_MASK_Z | _FPU_MASK_O | _FPU_MASK_U | _FPU_MASK_I \
| FE_ALL_EXCEPT)
static __always_inline void
libc_feholdexcept_loongarch (fenv_t *envp)
{
fpu_control_t cw;
/* Save the current state. */
_FPU_GETCW (cw);
envp->__fp_control_register = cw;
/* Clear all exception enable bits and flags. */
cw &= ~(_FPU_MASK_ALL);
_FPU_SETCW (cw);
}
#define libc_feholdexcept libc_feholdexcept_loongarch
#define libc_feholdexceptf libc_feholdexcept_loongarch
#define libc_feholdexceptl libc_feholdexcept_loongarch
static __always_inline void
libc_fesetround_loongarch (int round)
{
fpu_control_t cw;
/* Get current state. */
_FPU_GETCW (cw);
/* Set rounding bits. */
cw &= ~_FPU_RC_MASK;
cw |= round;
/* Set new state. */
_FPU_SETCW (cw);
}
#define libc_fesetround libc_fesetround_loongarch
#define libc_fesetroundf libc_fesetround_loongarch
#define libc_fesetroundl libc_fesetround_loongarch
static __always_inline void
libc_feholdexcept_setround_loongarch (fenv_t *envp, int round)
{
fpu_control_t cw;
/* Save the current state. */
_FPU_GETCW (cw);
envp->__fp_control_register = cw;
/* Clear all exception enable bits and flags. */
cw &= ~(_FPU_MASK_ALL);
/* Set rounding bits. */
cw &= ~_FPU_RC_MASK;
cw |= round;
/* Set new state. */
_FPU_SETCW (cw);
}
#define libc_feholdexcept_setround libc_feholdexcept_setround_loongarch
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_loongarch
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_loongarch
#define libc_feholdsetround libc_feholdexcept_setround_loongarch
#define libc_feholdsetroundf libc_feholdexcept_setround_loongarch
#define libc_feholdsetroundl libc_feholdexcept_setround_loongarch
static __always_inline void
libc_fesetenv_loongarch (fenv_t *envp)
{
fpu_control_t cw __attribute__ ((unused));
/* Read current state to flush fpu pipeline. */
_FPU_GETCW (cw);
_FPU_SETCW (envp->__fp_control_register);
}
#define libc_fesetenv libc_fesetenv_loongarch
#define libc_fesetenvf libc_fesetenv_loongarch
#define libc_fesetenvl libc_fesetenv_loongarch
static __always_inline int
libc_feupdateenv_test_loongarch (fenv_t *envp, int excepts)
{
/* int ret = fetestexcept (excepts); feupdateenv (envp); return ret; */
int cw, temp;
/* Get current control word. */
_FPU_GETCW (cw);
/* Set flag bits (which are accumulative), and *also* set the
cause bits. The setting of the cause bits is what actually causes
the hardware to generate the exception, if the corresponding enable
bit is set as well. */
temp = cw & FE_ALL_EXCEPT;
temp |= envp->__fp_control_register | (temp << CAUSE_SHIFT);
/* Set new state. */
_FPU_SETCW (temp);
return cw & excepts & FE_ALL_EXCEPT;
}
#define libc_feupdateenv_test libc_feupdateenv_test_loongarch
#define libc_feupdateenv_testf libc_feupdateenv_test_loongarch
#define libc_feupdateenv_testl libc_feupdateenv_test_loongarch
static __always_inline void
libc_feupdateenv_loongarch (fenv_t *envp)
{
libc_feupdateenv_test_loongarch (envp, 0);
}
#define libc_feupdateenv libc_feupdateenv_loongarch
#define libc_feupdateenvf libc_feupdateenv_loongarch
#define libc_feupdateenvl libc_feupdateenv_loongarch
#define libc_feresetround libc_feupdateenv_loongarch
#define libc_feresetroundf libc_feupdateenv_loongarch
#define libc_feresetroundl libc_feupdateenv_loongarch
static __always_inline int
libc_fetestexcept_loongarch (int excepts)
{
int cw;
/* Get current control word. */
_FPU_GETCW (cw);
return cw & excepts & FE_ALL_EXCEPT;
}
#define libc_fetestexcept libc_fetestexcept_loongarch
#define libc_fetestexceptf libc_fetestexcept_loongarch
#define libc_fetestexceptl libc_fetestexcept_loongarch
/* Enable support for rounding mode context. */
#define HAVE_RM_CTX 1
static __always_inline void
libc_feholdexcept_setround_loongarch_ctx (struct rm_ctx *ctx, int round)
{
fpu_control_t old, new;
/* Save the current state. */
_FPU_GETCW (old);
ctx->env.__fp_control_register = old;
/* Clear all exception enable bits and flags. */
new = old & ~(_FPU_MASK_ALL);
/* Set rounding bits. */
new = (new & ~_FPU_RC_MASK) | round;
if (__glibc_unlikely (new != old))
{
_FPU_SETCW (new);
ctx->updated_status = true;
}
else
ctx->updated_status = false;
}
#define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_loongarch_ctx
#define libc_feholdexcept_setroundf_ctx \
libc_feholdexcept_setround_loongarch_ctx
#define libc_feholdexcept_setroundl_ctx \
libc_feholdexcept_setround_loongarch_ctx
static __always_inline void
libc_fesetenv_loongarch_ctx (struct rm_ctx *ctx)
{
libc_fesetenv_loongarch (&ctx->env);
}
#define libc_fesetenv_ctx libc_fesetenv_loongarch_ctx
#define libc_fesetenvf_ctx libc_fesetenv_loongarch_ctx
#define libc_fesetenvl_ctx libc_fesetenv_loongarch_ctx
static __always_inline void
libc_feupdateenv_loongarch_ctx (struct rm_ctx *ctx)
{
if (__glibc_unlikely (ctx->updated_status))
libc_feupdateenv_test_loongarch (&ctx->env, 0);
}
#define libc_feupdateenv_ctx libc_feupdateenv_loongarch_ctx
#define libc_feupdateenvf_ctx libc_feupdateenv_loongarch_ctx
#define libc_feupdateenvl_ctx libc_feupdateenv_loongarch_ctx
#define libc_feresetround_ctx libc_feupdateenv_loongarch_ctx
#define libc_feresetroundf_ctx libc_feupdateenv_loongarch_ctx
#define libc_feresetroundl_ctx libc_feupdateenv_loongarch_ctx
static __always_inline void
libc_feholdsetround_loongarch_ctx (struct rm_ctx *ctx, int round)
{
fpu_control_t old, new;
/* Save the current state. */
_FPU_GETCW (old);
ctx->env.__fp_control_register = old;
/* Set rounding bits. */
new = (old & ~_FPU_RC_MASK) | round;
if (__glibc_unlikely (new != old))
{
_FPU_SETCW (new);
ctx->updated_status = true;
}
else
ctx->updated_status = false;
}
#define libc_feholdsetround_ctx libc_feholdsetround_loongarch_ctx
#define libc_feholdsetroundf_ctx libc_feholdsetround_loongarch_ctx
#define libc_feholdsetroundl_ctx libc_feholdsetround_loongarch_ctx
#endif
#include_next <math_private.h>
#endif
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