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304 lines
8.3 KiB
C
304 lines
8.3 KiB
C
/* Private floating point rounding and exceptions handling. AArch64 version.
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Copyright (C) 2014-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef AARCH64_FENV_PRIVATE_H
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#define AARCH64_FENV_PRIVATE_H 1
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#include <fenv.h>
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#include <fpu_control.h>
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static __always_inline void
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libc_feholdexcept_aarch64 (fenv_t *envp)
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{
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fpu_control_t fpcr;
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fpu_control_t new_fpcr;
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fpu_fpsr_t fpsr;
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fpu_fpsr_t new_fpsr;
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_FPU_GETCW (fpcr);
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_FPU_GETFPSR (fpsr);
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envp->__fpcr = fpcr;
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envp->__fpsr = fpsr;
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/* Clear exception flags and set all exceptions to non-stop. */
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new_fpcr = fpcr & ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
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new_fpsr = fpsr & ~FE_ALL_EXCEPT;
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if (__glibc_unlikely (new_fpcr != fpcr))
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_FPU_SETCW (new_fpcr);
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if (new_fpsr != fpsr)
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_FPU_SETFPSR (new_fpsr);
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}
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#define libc_feholdexcept libc_feholdexcept_aarch64
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#define libc_feholdexceptf libc_feholdexcept_aarch64
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#define libc_feholdexceptl libc_feholdexcept_aarch64
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static __always_inline void
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libc_fesetround_aarch64 (int round)
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{
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fpu_control_t fpcr;
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_FPU_GETCW (fpcr);
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/* Check whether rounding modes are different. */
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round = (fpcr ^ round) & _FPU_FPCR_RM_MASK;
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/* Set new rounding mode if different. */
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if (__glibc_unlikely (round != 0))
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_FPU_SETCW (fpcr ^ round);
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}
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#define libc_fesetround libc_fesetround_aarch64
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#define libc_fesetroundf libc_fesetround_aarch64
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#define libc_fesetroundl libc_fesetround_aarch64
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static __always_inline void
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libc_feholdexcept_setround_aarch64 (fenv_t *envp, int round)
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{
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fpu_control_t fpcr;
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fpu_control_t new_fpcr;
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fpu_fpsr_t fpsr;
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fpu_fpsr_t new_fpsr;
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_FPU_GETCW (fpcr);
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_FPU_GETFPSR (fpsr);
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envp->__fpcr = fpcr;
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envp->__fpsr = fpsr;
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/* Clear exception flags, set all exceptions to non-stop,
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and set new rounding mode. */
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new_fpcr = fpcr & ~((FE_ALL_EXCEPT << FE_EXCEPT_SHIFT) | _FPU_FPCR_RM_MASK);
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new_fpcr |= round;
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new_fpsr = fpsr & ~FE_ALL_EXCEPT;
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if (__glibc_unlikely (new_fpcr != fpcr))
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_FPU_SETCW (new_fpcr);
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if (new_fpsr != fpsr)
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_FPU_SETFPSR (new_fpsr);
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}
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#define libc_feholdexcept_setround libc_feholdexcept_setround_aarch64
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#define libc_feholdexcept_setroundf libc_feholdexcept_setround_aarch64
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#define libc_feholdexcept_setroundl libc_feholdexcept_setround_aarch64
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static __always_inline int
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libc_fetestexcept_aarch64 (int ex)
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{
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fpu_fpsr_t fpsr;
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_FPU_GETFPSR (fpsr);
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return fpsr & ex & FE_ALL_EXCEPT;
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}
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#define libc_fetestexcept libc_fetestexcept_aarch64
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#define libc_fetestexceptf libc_fetestexcept_aarch64
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#define libc_fetestexceptl libc_fetestexcept_aarch64
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static __always_inline void
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libc_fesetenv_aarch64 (const fenv_t *envp)
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{
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fpu_control_t fpcr;
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fpu_control_t new_fpcr;
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_FPU_GETCW (fpcr);
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new_fpcr = envp->__fpcr;
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if (__glibc_unlikely (fpcr != new_fpcr))
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_FPU_SETCW (new_fpcr);
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_FPU_SETFPSR (envp->__fpsr);
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}
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#define libc_fesetenv libc_fesetenv_aarch64
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#define libc_fesetenvf libc_fesetenv_aarch64
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#define libc_fesetenvl libc_fesetenv_aarch64
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#define libc_feresetround_noex libc_fesetenv_aarch64
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#define libc_feresetround_noexf libc_fesetenv_aarch64
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#define libc_feresetround_noexl libc_fesetenv_aarch64
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static __always_inline int
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libc_feupdateenv_test_aarch64 (const fenv_t *envp, int ex)
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{
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fpu_control_t fpcr;
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fpu_control_t new_fpcr;
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fpu_fpsr_t fpsr;
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fpu_fpsr_t new_fpsr;
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int excepts;
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_FPU_GETCW (fpcr);
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_FPU_GETFPSR (fpsr);
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/* Merge current exception flags with the saved fenv. */
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excepts = fpsr & FE_ALL_EXCEPT;
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new_fpcr = envp->__fpcr;
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new_fpsr = envp->__fpsr | excepts;
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if (__glibc_unlikely (fpcr != new_fpcr))
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_FPU_SETCW (new_fpcr);
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if (fpsr != new_fpsr)
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_FPU_SETFPSR (new_fpsr);
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/* Raise the exceptions if enabled in the new FP state. */
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if (__glibc_unlikely (excepts & (new_fpcr >> FE_EXCEPT_SHIFT)))
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__feraiseexcept (excepts);
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return excepts & ex;
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}
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#define libc_feupdateenv_test libc_feupdateenv_test_aarch64
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#define libc_feupdateenv_testf libc_feupdateenv_test_aarch64
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#define libc_feupdateenv_testl libc_feupdateenv_test_aarch64
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static __always_inline void
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libc_feupdateenv_aarch64 (const fenv_t *envp)
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{
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libc_feupdateenv_test_aarch64 (envp, 0);
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}
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#define libc_feupdateenv libc_feupdateenv_aarch64
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#define libc_feupdateenvf libc_feupdateenv_aarch64
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#define libc_feupdateenvl libc_feupdateenv_aarch64
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static __always_inline void
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libc_feholdsetround_aarch64 (fenv_t *envp, int round)
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{
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fpu_control_t fpcr;
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fpu_fpsr_t fpsr;
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_FPU_GETCW (fpcr);
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_FPU_GETFPSR (fpsr);
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envp->__fpcr = fpcr;
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envp->__fpsr = fpsr;
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/* Check whether rounding modes are different. */
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round = (fpcr ^ round) & _FPU_FPCR_RM_MASK;
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/* Set new rounding mode if different. */
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if (__glibc_unlikely (round != 0))
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_FPU_SETCW (fpcr ^ round);
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}
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#define libc_feholdsetround libc_feholdsetround_aarch64
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#define libc_feholdsetroundf libc_feholdsetround_aarch64
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#define libc_feholdsetroundl libc_feholdsetround_aarch64
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static __always_inline void
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libc_feresetround_aarch64 (fenv_t *envp)
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{
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fpu_control_t fpcr;
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int round;
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_FPU_GETCW (fpcr);
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/* Check whether rounding modes are different. */
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round = (envp->__fpcr ^ fpcr) & _FPU_FPCR_RM_MASK;
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/* Restore the rounding mode if it was changed. */
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if (__glibc_unlikely (round != 0))
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_FPU_SETCW (fpcr ^ round);
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}
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#define libc_feresetround libc_feresetround_aarch64
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#define libc_feresetroundf libc_feresetround_aarch64
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#define libc_feresetroundl libc_feresetround_aarch64
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/* We have support for rounding mode context. */
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#define HAVE_RM_CTX 1
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static __always_inline void
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libc_feholdsetround_aarch64_ctx (struct rm_ctx *ctx, int r)
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{
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fpu_control_t fpcr;
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int round;
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_FPU_GETCW (fpcr);
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ctx->env.__fpcr = fpcr;
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/* Check whether rounding modes are different. */
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round = (fpcr ^ r) & _FPU_FPCR_RM_MASK;
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ctx->updated_status = round != 0;
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/* Set the rounding mode if changed. */
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if (__glibc_unlikely (round != 0))
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_FPU_SETCW (fpcr ^ round);
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}
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#define libc_feholdsetround_ctx libc_feholdsetround_aarch64_ctx
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#define libc_feholdsetroundf_ctx libc_feholdsetround_aarch64_ctx
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#define libc_feholdsetroundl_ctx libc_feholdsetround_aarch64_ctx
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static __always_inline void
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libc_feresetround_aarch64_ctx (struct rm_ctx *ctx)
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{
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/* Restore the rounding mode if updated. */
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if (__glibc_unlikely (ctx->updated_status))
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_FPU_SETCW (ctx->env.__fpcr);
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}
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#define libc_feresetround_ctx libc_feresetround_aarch64_ctx
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#define libc_feresetroundf_ctx libc_feresetround_aarch64_ctx
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#define libc_feresetroundl_ctx libc_feresetround_aarch64_ctx
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static __always_inline void
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libc_feholdsetround_noex_aarch64_ctx (struct rm_ctx *ctx, int r)
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{
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fpu_control_t fpcr;
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fpu_fpsr_t fpsr;
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int round;
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_FPU_GETCW (fpcr);
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_FPU_GETFPSR (fpsr);
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ctx->env.__fpcr = fpcr;
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ctx->env.__fpsr = fpsr;
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/* Check whether rounding modes are different. */
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round = (fpcr ^ r) & _FPU_FPCR_RM_MASK;
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ctx->updated_status = round != 0;
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/* Set the rounding mode if changed. */
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if (__glibc_unlikely (round != 0))
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_FPU_SETCW (fpcr ^ round);
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}
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#define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_aarch64_ctx
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#define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_aarch64_ctx
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#define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_aarch64_ctx
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static __always_inline void
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libc_feresetround_noex_aarch64_ctx (struct rm_ctx *ctx)
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{
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/* Restore the rounding mode if updated. */
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if (__glibc_unlikely (ctx->updated_status))
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_FPU_SETCW (ctx->env.__fpcr);
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/* Write new FPSR to restore exception flags. */
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_FPU_SETFPSR (ctx->env.__fpsr);
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}
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#define libc_feresetround_noex_ctx libc_feresetround_noex_aarch64_ctx
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#define libc_feresetround_noexf_ctx libc_feresetround_noex_aarch64_ctx
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#define libc_feresetround_noexl_ctx libc_feresetround_noex_aarch64_ctx
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#include_next <fenv_private.h>
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#endif
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