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250 lines
6.9 KiB
C
250 lines
6.9 KiB
C
/* Private floating point rounding and exceptions handling. ARM VFP version.
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Copyright (C) 2014-2017 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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<http://www.gnu.org/licenses/>. */
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#ifndef FENV_PRIVATE_H
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#define 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_vfp (fenv_t *envp)
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{
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fpu_control_t fpscr;
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_FPU_GETCW (fpscr);
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envp->__cw = fpscr;
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/* Clear exception flags and set all exceptions to non-stop. */
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fpscr &= ~_FPU_MASK_EXCEPT;
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_FPU_SETCW (fpscr);
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}
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static __always_inline void
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libc_fesetround_vfp (int round)
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{
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fpu_control_t fpscr;
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_FPU_GETCW (fpscr);
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/* Set new rounding mode if different. */
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if (__glibc_unlikely ((fpscr & _FPU_MASK_RM) != round))
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_FPU_SETCW ((fpscr & ~_FPU_MASK_RM) | round);
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}
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static __always_inline void
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libc_feholdexcept_setround_vfp (fenv_t *envp, int round)
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{
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fpu_control_t fpscr;
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_FPU_GETCW (fpscr);
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envp->__cw = fpscr;
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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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fpscr &= ~(_FPU_MASK_EXCEPT | _FPU_MASK_RM);
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_FPU_SETCW (fpscr | round);
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}
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static __always_inline void
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libc_feholdsetround_vfp (fenv_t *envp, int round)
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{
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fpu_control_t fpscr;
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_FPU_GETCW (fpscr);
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envp->__cw = fpscr;
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/* Set new rounding mode if different. */
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if (__glibc_unlikely ((fpscr & _FPU_MASK_RM) != round))
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_FPU_SETCW ((fpscr & ~_FPU_MASK_RM) | round);
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}
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static __always_inline void
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libc_feresetround_vfp (fenv_t *envp)
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{
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fpu_control_t fpscr, round;
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_FPU_GETCW (fpscr);
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/* Check whether rounding modes are different. */
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round = (envp->__cw ^ fpscr) & _FPU_MASK_RM;
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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 (fpscr ^ round);
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}
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static __always_inline int
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libc_fetestexcept_vfp (int ex)
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{
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fpu_control_t fpscr;
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_FPU_GETCW (fpscr);
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return fpscr & ex & FE_ALL_EXCEPT;
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}
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static __always_inline void
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libc_fesetenv_vfp (const fenv_t *envp)
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{
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fpu_control_t fpscr, new_fpscr;
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_FPU_GETCW (fpscr);
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new_fpscr = envp->__cw;
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/* Write new FPSCR if different (ignoring NZCV flags). */
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if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
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_FPU_SETCW (new_fpscr);
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}
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static __always_inline int
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libc_feupdateenv_test_vfp (const fenv_t *envp, int ex)
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{
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fpu_control_t fpscr, new_fpscr;
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int excepts;
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_FPU_GETCW (fpscr);
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/* Merge current exception flags with the saved fenv. */
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excepts = fpscr & FE_ALL_EXCEPT;
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new_fpscr = envp->__cw | excepts;
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/* Write new FPSCR if different (ignoring NZCV flags). */
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if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
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_FPU_SETCW (new_fpscr);
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/* Raise the exceptions if enabled in the new FP state. */
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if (__glibc_unlikely (excepts & (new_fpscr >> FE_EXCEPT_SHIFT)))
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__feraiseexcept (excepts);
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return excepts & ex;
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}
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static __always_inline void
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libc_feupdateenv_vfp (const fenv_t *envp)
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{
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libc_feupdateenv_test_vfp (envp, 0);
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}
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static __always_inline void
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libc_feholdsetround_vfp_ctx (struct rm_ctx *ctx, int r)
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{
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fpu_control_t fpscr, round;
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_FPU_GETCW (fpscr);
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ctx->updated_status = false;
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ctx->env.__cw = fpscr;
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/* Check whether rounding modes are different. */
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round = (fpscr ^ r) & _FPU_MASK_RM;
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/* Set the rounding mode if changed. */
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if (__glibc_unlikely (round != 0))
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{
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ctx->updated_status = true;
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_FPU_SETCW (fpscr ^ round);
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}
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}
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static __always_inline void
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libc_feresetround_vfp_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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{
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fpu_control_t fpscr;
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_FPU_GETCW (fpscr);
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fpscr = (fpscr & ~_FPU_MASK_RM) | (ctx->env.__cw & _FPU_MASK_RM);
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_FPU_SETCW (fpscr);
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}
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}
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static __always_inline void
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libc_fesetenv_vfp_ctx (struct rm_ctx *ctx)
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{
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fpu_control_t fpscr, new_fpscr;
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_FPU_GETCW (fpscr);
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new_fpscr = ctx->env.__cw;
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/* Write new FPSCR if different (ignoring NZCV flags). */
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if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
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_FPU_SETCW (new_fpscr);
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}
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#ifndef __SOFTFP__
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# define libc_feholdexcept libc_feholdexcept_vfp
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# define libc_feholdexceptf libc_feholdexcept_vfp
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# define libc_feholdexceptl libc_feholdexcept_vfp
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# define libc_fesetround libc_fesetround_vfp
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# define libc_fesetroundf libc_fesetround_vfp
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# define libc_fesetroundl libc_fesetround_vfp
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# define libc_feresetround libc_feresetround_vfp
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# define libc_feresetroundf libc_feresetround_vfp
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# define libc_feresetroundl libc_feresetround_vfp
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# define libc_feresetround_noex libc_fesetenv_vfp
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# define libc_feresetround_noexf libc_fesetenv_vfp
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# define libc_feresetround_noexl libc_fesetenv_vfp
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# define libc_feholdexcept_setround libc_feholdexcept_setround_vfp
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# define libc_feholdexcept_setroundf libc_feholdexcept_setround_vfp
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# define libc_feholdexcept_setroundl libc_feholdexcept_setround_vfp
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# define libc_feholdsetround libc_feholdsetround_vfp
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# define libc_feholdsetroundf libc_feholdsetround_vfp
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# define libc_feholdsetroundl libc_feholdsetround_vfp
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# define libc_fetestexcept libc_fetestexcept_vfp
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# define libc_fetestexceptf libc_fetestexcept_vfp
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# define libc_fetestexceptl libc_fetestexcept_vfp
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# define libc_fesetenv libc_fesetenv_vfp
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# define libc_fesetenvf libc_fesetenv_vfp
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# define libc_fesetenvl libc_fesetenv_vfp
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# define libc_feupdateenv libc_feupdateenv_vfp
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# define libc_feupdateenvf libc_feupdateenv_vfp
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# define libc_feupdateenvl libc_feupdateenv_vfp
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# define libc_feupdateenv_test libc_feupdateenv_test_vfp
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# define libc_feupdateenv_testf libc_feupdateenv_test_vfp
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# define libc_feupdateenv_testl libc_feupdateenv_test_vfp
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/* We have support for rounding mode context. */
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#define HAVE_RM_CTX 1
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# define libc_feholdsetround_ctx libc_feholdsetround_vfp_ctx
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# define libc_feresetround_ctx libc_feresetround_vfp_ctx
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# define libc_feresetround_noex_ctx libc_fesetenv_vfp_ctx
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# define libc_feholdsetroundf_ctx libc_feholdsetround_vfp_ctx
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# define libc_feresetroundf_ctx libc_feresetround_vfp_ctx
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# define libc_feresetround_noexf_ctx libc_fesetenv_vfp_ctx
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# define libc_feholdsetroundl_ctx libc_feholdsetround_vfp_ctx
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# define libc_feresetroundl_ctx libc_feresetround_vfp_ctx
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# define libc_feresetround_noexl_ctx libc_fesetenv_vfp_ctx
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#endif
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#endif /* FENV_PRIVATE_H */
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