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ff6b24501f
On some architectures, the parts of math_private.h relating to the floating-point environment are in a separate file fenv_private.h included from math_private.h. As this is purely an architecture-specific convention used by several architectures, however, all such architectures still need their own math_private.h, even if it has nothing to do beyond #include <fenv_private.h> and peculiarity of including the i386 file directly instead of having a shared file in sysdeps/x86. This patch makes the fenv_private.h name an architecture-independent convention in glibc. The include of fenv_private.h from math_private.h becomes architecture-independent (until callers are updated to include fenv_private.h directly so the include from math_private.h is no longer needed). Some architecture math_private.h headers are removed if no longer needed, or renamed to fenv_private.h if all they define belongs in that header; architecture fenv_private.h headers now do require #include_next <fenv_private.h>. The i386 fenv_private.h file moves to sysdeps/x86/fpu/ to reflect how it is actually shared with x86_64. The generic math_private.h gets a new include of <stdbool.h>, as needed for bool in some prototypes in that header (previously that was indirectly included via include/fenv.h, which now only gets included too late in math_private.h, after those prototypes). Tested for x86_64 and x86, and tested with build-many-glibcs.py that installed stripped shared libraries are unchanged by the patch. * sysdeps/aarch64/fpu/fenv_private.h: New file. Based on .... * sysdeps/aarch64/fpu/math_private.h: ... this file. All contents moved to fenv_private.h except for ... (TOINT_INTRINSICS): Kept in math_private.h. (roundtoint): Likewise. (converttoint): Likewise. * sysdeps/arm/fenv_private.h: Change multiple-include guard to [ARM_FENV_PRIVATE_H]. Include next <fenv_private.h>. * sysdeps/arm/math_private.h: Remove. * sysdeps/generic/fenv_private.h: New file. Contents moved from .... * sysdeps/generic/math_private.h: ... this file. Include <stdbool.h>. Do not include <fenv.h> or <get-rounding-mode.h>. Include <fenv_private.h>. Remove functions and macros moved to fenv_private.h. * sysdeps/i386/fpu/math_private.h: Remove. * sysdeps/mips/math_private.h: Move to .... * sysdeps/mips/fpu/fenv_private.h: ... here. Change multiple-include guard to [MIPS_FENV_PRIVATE_H]. Remove [__mips_hard_float] conditional. Include next <fenv_private.h>. * sysdeps/powerpc/fpu/fenv_private.h: Change multiple-include guard to [POWERPC_FENV_PRIVATE_H]. Include next <fenv_private.h>. * sysdeps/powerpc/fpu/math_private.h: Do not include <fenv_private.h>. * sysdeps/riscv/rvf/math_private.h: Move to .... * sysdeps/riscv/rvf/fenv_private.h: ... here. Change multiple-include guard to [RISCV_FENV_PRIVATE_H]. Include next <fenv_private.h>. * sysdeps/sparc/fpu/fenv_private.h: Change multiple-include guard to [SPARC_FENV_PRIVATE_H]. Include next <fenv_private.h>. * sysdeps/sparc/fpu/math_private.h: Remove. * sysdeps/i386/fpu/fenv_private.h: Move to .... * sysdeps/x86/fpu/fenv_private.h: ... here. Change multiple-include guard to [X86_FENV_PRIVATE_H]. Include next <fenv_private.h>. * sysdeps/x86_64/fpu/math_private.h: Do not include <sysdeps/i386/fpu/fenv_private.h>.
252 lines
6.9 KiB
C
252 lines
6.9 KiB
C
/* Private floating point rounding and exceptions handling. ARM VFP version.
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Copyright (C) 2014-2018 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 ARM_FENV_PRIVATE_H
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#define ARM_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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#include_next <fenv_private.h>
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#endif /* ARM_FENV_PRIVATE_H */
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