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/* Private floating point rounding and exceptions handling. 390/s390x version.
Copyright (C) 2019-2024 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 S390_FENV_PRIVATE_H
#define S390_FENV_PRIVATE_H 1
#include <fenv.h>
#include <fenv_libc.h>
#include <fpu_control.h>
static __always_inline void
libc_feholdexcept_s390 (fenv_t *envp)
{
fpu_control_t fpc, fpc_new;
/* Store the environment. */
_FPU_GETCW (fpc);
envp->__fpc = fpc;
/* Clear the current exception flags and dxc field.
Hold from generating fpu exceptions temporarily. */
fpc_new = fpc & ~(FPC_FLAGS_MASK | FPC_DXC_MASK | FPC_EXCEPTION_MASK);
/* Only set new environment if it has changed. */
if (fpc_new != fpc)
_FPU_SETCW (fpc_new);
}
#define libc_feholdexcept libc_feholdexcept_s390
#define libc_feholdexceptf libc_feholdexcept_s390
#define libc_feholdexceptl libc_feholdexcept_s390
static __always_inline void
libc_fesetround_s390 (int round)
{
__asm__ __volatile__ ("srnm 0(%0)" : : "a" (round));
}
#define libc_fesetround libc_fesetround_s390
#define libc_fesetroundf libc_fesetround_s390
#define libc_fesetroundl libc_fesetround_s390
static __always_inline void
libc_feholdexcept_setround_s390 (fenv_t *envp, int r)
{
fpu_control_t fpc, fpc_new;
_FPU_GETCW (fpc);
envp->__fpc = fpc;
/* Clear the current exception flags and dxc field.
Hold from generating fpu exceptions temporarily.
Reset rounding mode bits. */
fpc_new = fpc & ~(FPC_FLAGS_MASK | FPC_DXC_MASK | FPC_EXCEPTION_MASK
| FPC_RM_MASK);
/* Set new rounding mode. */
fpc_new |= (r & FPC_RM_MASK);
/* Only set new environment if it has changed. */
if (fpc_new != fpc)
_FPU_SETCW (fpc_new);
}
#define libc_feholdexcept_setround libc_feholdexcept_setround_s390
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_s390
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_s390
static __always_inline int
libc_fetestexcept_s390 (int excepts)
{
int res;
fexcept_t fpc;
_FPU_GETCW (fpc);
/* Get current exceptions. */
res = (fpc >> FPC_FLAGS_SHIFT) & FE_ALL_EXCEPT;
if ((fpc & FPC_NOT_FPU_EXCEPTION) == 0)
/* Bits 6, 7 of dxc-byte are zero,
thus bits 0-5 of dxc-byte correspond to the flag-bits.
Evaluate flags and last dxc-exception-code. */
res |= (fpc >> FPC_DXC_SHIFT) & FE_ALL_EXCEPT;
return res & excepts;
}
#define libc_fetestexcept libc_fetestexcept_s390
#define libc_fetestexceptf libc_fetestexcept_s390
#define libc_fetestexceptl libc_fetestexcept_s390
static __always_inline void
libc_fesetenv_s390 (const fenv_t *envp)
{
_FPU_SETCW (envp->__fpc);
}
#define libc_fesetenv libc_fesetenv_s390
#define libc_fesetenvf libc_fesetenv_s390
#define libc_fesetenvl libc_fesetenv_s390
static __always_inline int
libc_feupdateenv_test_s390 (const fenv_t *envp, int ex)
{
/* Get the currently raised exceptions. */
int excepts;
fexcept_t fpc_old;
_FPU_GETCW (fpc_old);
/* Get current exceptions. */
excepts = (fpc_old >> FPC_FLAGS_SHIFT) & FE_ALL_EXCEPT;
if ((fpc_old & FPC_NOT_FPU_EXCEPTION) == 0)
/* Bits 6, 7 of dxc-byte are zero,
thus bits 0-5 of dxc-byte correspond to the flag-bits.
Evaluate flags and last dxc-exception-code. */
excepts |= (fpc_old >> FPC_DXC_SHIFT) & FE_ALL_EXCEPT;
/* Merge the currently raised exceptions with those in envp. */
fpu_control_t fpc_new = envp->__fpc;
fpc_new |= excepts << FPC_FLAGS_SHIFT;
/* Install the new fpc from envp. */
if (fpc_new != fpc_old)
_FPU_SETCW (fpc_new);
/* Raise the exceptions if enabled in new fpc. */
if (__glibc_unlikely ((fpc_new >> FPC_EXCEPTION_MASK_SHIFT) & excepts))
__feraiseexcept (excepts);
return excepts & ex;
}
#define libc_feupdateenv_test libc_feupdateenv_test_s390
#define libc_feupdateenv_testf libc_feupdateenv_test_s390
#define libc_feupdateenv_testl libc_feupdateenv_test_s390
static __always_inline void
libc_feupdateenv_s390 (const fenv_t *envp)
{
libc_feupdateenv_test_s390 (envp, 0);
}
#define libc_feupdateenv libc_feupdateenv_s390
#define libc_feupdateenvf libc_feupdateenv_s390
#define libc_feupdateenvl libc_feupdateenv_s390
static __always_inline fenv_t
libc_handle_user_fenv_s390 (const fenv_t *envp)
{
fenv_t env;
if (envp == FE_DFL_ENV)
{
env.__fpc = _FPU_DEFAULT;
}
else if (envp == FE_NOMASK_ENV)
{
env.__fpc = FPC_EXCEPTION_MASK;
}
else
env = (*envp);
return env;
}
/* We have support for rounding mode context. */
#define HAVE_RM_CTX 1
static __always_inline void
libc_feholdsetround_s390_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpc;
int round;
_FPU_GETCW (fpc);
ctx->env.__fpc = fpc;
/* Check whether rounding modes are different. */
round = fpc & FPC_RM_MASK;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != r))
{
ctx->updated_status = true;
libc_fesetround_s390 (r);
}
else
ctx->updated_status = false;
}
#define libc_feholdsetround_ctx libc_feholdsetround_s390_ctx
#define libc_feholdsetroundf_ctx libc_feholdsetround_s390_ctx
#define libc_feholdsetroundl_ctx libc_feholdsetround_s390_ctx
static __always_inline void
libc_feresetround_s390_ctx (struct rm_ctx *ctx)
{
/* Restore the rounding mode if updated. */
if (__glibc_unlikely (ctx->updated_status))
{
fpu_control_t fpc;
_FPU_GETCW (fpc);
fpc = ctx->env.__fpc | (fpc & FPC_FLAGS_MASK);
_FPU_SETCW (fpc);
}
}
#define libc_feresetround_ctx libc_feresetround_s390_ctx
#define libc_feresetroundf_ctx libc_feresetround_s390_ctx
#define libc_feresetroundl_ctx libc_feresetround_s390_ctx
static __always_inline void
libc_feholdsetround_noex_s390_ctx (struct rm_ctx *ctx, int r)
{
libc_feholdexcept_setround_s390 (&ctx->env, r);
}
#define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_s390_ctx
#define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_s390_ctx
#define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_s390_ctx
static __always_inline void
libc_feresetround_noex_s390_ctx (struct rm_ctx *ctx)
{
/* Restore exception flags and rounding mode. */
libc_fesetenv_s390 (&ctx->env);
}
#define libc_feresetround_noex_ctx libc_feresetround_noex_s390_ctx
#define libc_feresetround_noexf_ctx libc_feresetround_noex_s390_ctx
#define libc_feresetround_noexl_ctx libc_feresetround_noex_s390_ctx
#include_next <fenv_private.h>
#endif
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