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/* Private floating point rounding and exceptions handling. AArch64 version.
Copyright (C) 2014-2016 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 AARCH64_MATH_PRIVATE_H
#define AARCH64_MATH_PRIVATE_H 1
#include <fenv.h>
#include <fpu_control.h>
#define math_opt_barrier(x) \
({ __typeof (x) __x = (x); __asm ("" : "+w" (__x)); __x; })
#define math_force_eval(x) \
({ __typeof (x) __x = (x); __asm __volatile__ ("" : : "w" (__x)); })
extern __always_inline double
__ieee754_sqrt (double d)
{
double res;
asm __volatile__ ("fsqrt %d0, %d1" : "=w" (res) : "w" (d));
return res;
}
extern __always_inline float
__ieee754_sqrtf (float s)
{
float res;
asm __volatile__ ("fsqrt %s0, %s1" : "=w" (res) : "w" (s));
return res;
}
static __always_inline void
libc_feholdexcept_aarch64 (fenv_t *envp)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
fpu_fpsr_t fpsr;
fpu_fpsr_t new_fpsr;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
envp->__fpcr = fpcr;
envp->__fpsr = fpsr;
/* Clear exception flags and set all exceptions to non-stop. */
new_fpcr = fpcr & ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
new_fpsr = fpsr & ~FE_ALL_EXCEPT;
if (__glibc_unlikely (new_fpcr != fpcr))
_FPU_SETCW (new_fpcr);
if (new_fpsr != fpsr)
_FPU_SETFPSR (new_fpsr);
}
#define libc_feholdexcept libc_feholdexcept_aarch64
#define libc_feholdexceptf libc_feholdexcept_aarch64
#define libc_feholdexceptl libc_feholdexcept_aarch64
static __always_inline void
libc_fesetround_aarch64 (int round)
{
fpu_control_t fpcr;
_FPU_GETCW (fpcr);
/* Check whether rounding modes are different. */
round = (fpcr ^ round) & _FPU_FPCR_RM_MASK;
/* Set new rounding mode if different. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_fesetround libc_fesetround_aarch64
#define libc_fesetroundf libc_fesetround_aarch64
#define libc_fesetroundl libc_fesetround_aarch64
static __always_inline void
libc_feholdexcept_setround_aarch64 (fenv_t *envp, int round)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
fpu_fpsr_t fpsr;
fpu_fpsr_t new_fpsr;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
envp->__fpcr = fpcr;
envp->__fpsr = fpsr;
/* Clear exception flags, set all exceptions to non-stop,
and set new rounding mode. */
new_fpcr = fpcr & ~((FE_ALL_EXCEPT << FE_EXCEPT_SHIFT) | _FPU_FPCR_RM_MASK);
new_fpcr |= round;
new_fpsr = fpsr & ~FE_ALL_EXCEPT;
if (__glibc_unlikely (new_fpcr != fpcr))
_FPU_SETCW (new_fpcr);
if (new_fpsr != fpsr)
_FPU_SETFPSR (new_fpsr);
}
#define libc_feholdexcept_setround libc_feholdexcept_setround_aarch64
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_aarch64
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_aarch64
static __always_inline int
libc_fetestexcept_aarch64 (int ex)
{
fpu_fpsr_t fpsr;
_FPU_GETFPSR (fpsr);
return fpsr & ex & FE_ALL_EXCEPT;
}
#define libc_fetestexcept libc_fetestexcept_aarch64
#define libc_fetestexceptf libc_fetestexcept_aarch64
#define libc_fetestexceptl libc_fetestexcept_aarch64
static __always_inline void
libc_fesetenv_aarch64 (const fenv_t *envp)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
_FPU_GETCW (fpcr);
new_fpcr = envp->__fpcr;
if (__glibc_unlikely (fpcr != new_fpcr))
_FPU_SETCW (new_fpcr);
_FPU_SETFPSR (envp->__fpsr);
}
#define libc_fesetenv libc_fesetenv_aarch64
#define libc_fesetenvf libc_fesetenv_aarch64
#define libc_fesetenvl libc_fesetenv_aarch64
#define libc_feresetround_noex libc_fesetenv_aarch64
#define libc_feresetround_noexf libc_fesetenv_aarch64
#define libc_feresetround_noexl libc_fesetenv_aarch64
static __always_inline int
libc_feupdateenv_test_aarch64 (const fenv_t *envp, int ex)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
fpu_fpsr_t fpsr;
fpu_fpsr_t new_fpsr;
int excepts;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
/* Merge current exception flags with the saved fenv. */
excepts = fpsr & FE_ALL_EXCEPT;
new_fpcr = envp->__fpcr;
new_fpsr = envp->__fpsr | excepts;
if (__glibc_unlikely (fpcr != new_fpcr))
_FPU_SETCW (new_fpcr);
if (fpsr != new_fpsr)
_FPU_SETFPSR (new_fpsr);
/* Raise the exceptions if enabled in the new FP state. */
if (__glibc_unlikely (excepts & (new_fpcr >> FE_EXCEPT_SHIFT)))
__feraiseexcept (excepts);
return excepts & ex;
}
#define libc_feupdateenv_test libc_feupdateenv_test_aarch64
#define libc_feupdateenv_testf libc_feupdateenv_test_aarch64
#define libc_feupdateenv_testl libc_feupdateenv_test_aarch64
static __always_inline void
libc_feupdateenv_aarch64 (const fenv_t *envp)
{
libc_feupdateenv_test_aarch64 (envp, 0);
}
#define libc_feupdateenv libc_feupdateenv_aarch64
#define libc_feupdateenvf libc_feupdateenv_aarch64
#define libc_feupdateenvl libc_feupdateenv_aarch64
static __always_inline void
libc_feholdsetround_aarch64 (fenv_t *envp, int round)
{
fpu_control_t fpcr;
fpu_fpsr_t fpsr;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
envp->__fpcr = fpcr;
envp->__fpsr = fpsr;
/* Check whether rounding modes are different. */
round = (fpcr ^ round) & _FPU_FPCR_RM_MASK;
/* Set new rounding mode if different. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feholdsetround libc_feholdsetround_aarch64
#define libc_feholdsetroundf libc_feholdsetround_aarch64
#define libc_feholdsetroundl libc_feholdsetround_aarch64
static __always_inline void
libc_feresetround_aarch64 (fenv_t *envp)
{
fpu_control_t fpcr;
int round;
_FPU_GETCW (fpcr);
/* Check whether rounding modes are different. */
round = (envp->__fpcr ^ fpcr) & _FPU_FPCR_RM_MASK;
/* Restore the rounding mode if it was changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feresetround libc_feresetround_aarch64
#define libc_feresetroundf libc_feresetround_aarch64
#define libc_feresetroundl libc_feresetround_aarch64
/* We have support for rounding mode context. */
#define HAVE_RM_CTX 1
static __always_inline void
libc_feholdsetround_aarch64_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpcr;
int round;
_FPU_GETCW (fpcr);
ctx->env.__fpcr = fpcr;
/* Check whether rounding modes are different. */
round = (fpcr ^ r) & _FPU_FPCR_RM_MASK;
ctx->updated_status = round != 0;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feholdsetround_ctx libc_feholdsetround_aarch64_ctx
#define libc_feholdsetroundf_ctx libc_feholdsetround_aarch64_ctx
#define libc_feholdsetroundl_ctx libc_feholdsetround_aarch64_ctx
static __always_inline void
libc_feresetround_aarch64_ctx (struct rm_ctx *ctx)
{
/* Restore the rounding mode if updated. */
if (__glibc_unlikely (ctx->updated_status))
_FPU_SETCW (ctx->env.__fpcr);
}
#define libc_feresetround_ctx libc_feresetround_aarch64_ctx
#define libc_feresetroundf_ctx libc_feresetround_aarch64_ctx
#define libc_feresetroundl_ctx libc_feresetround_aarch64_ctx
static __always_inline void
libc_feholdsetround_noex_aarch64_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpcr;
fpu_fpsr_t fpsr;
int round;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
ctx->env.__fpcr = fpcr;
ctx->env.__fpsr = fpsr;
/* Check whether rounding modes are different. */
round = (fpcr ^ r) & _FPU_FPCR_RM_MASK;
ctx->updated_status = round != 0;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_aarch64_ctx
#define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_aarch64_ctx
#define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_aarch64_ctx
static __always_inline void
libc_feresetround_noex_aarch64_ctx (struct rm_ctx *ctx)
{
/* Restore the rounding mode if updated. */
if (__glibc_unlikely (ctx->updated_status))
_FPU_SETCW (ctx->env.__fpcr);
/* Write new FPSR to restore exception flags. */
_FPU_SETFPSR (ctx->env.__fpsr);
}
#define libc_feresetround_noex_ctx libc_feresetround_noex_aarch64_ctx
#define libc_feresetround_noexf_ctx libc_feresetround_noex_aarch64_ctx
#define libc_feresetround_noexl_ctx libc_feresetround_noex_aarch64_ctx
#include_next <math_private.h>
#endif
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