162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
/* Private floating point rounding and exceptions handling. RISC-V version.
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Copyright (C) 2014-2022 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 RISCV_FENV_PRIVATE_H
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#define RISCV_FENV_PRIVATE_H 1
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#include <fenv.h>
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#include <fpu_control.h>
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#include <get-rounding-mode.h>
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static __always_inline int
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riscv_getround (void)
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{
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return get_rounding_mode ();
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}
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static __always_inline void
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riscv_setround (int rm)
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{
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asm volatile ("fsrm %z0" : : "rJ" (rm));
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}
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static __always_inline int
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riscv_getflags (void)
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{
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int flags;
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asm volatile ("frflags %0" : "=r" (flags));
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return flags;
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}
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static __always_inline void
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riscv_setflags (int flags)
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{
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asm volatile ("fsflags %z0" : : "rJ" (flags));
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}
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static __always_inline void
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libc_feholdexcept_riscv (fenv_t *envp)
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{
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asm volatile ("csrrc %0, fcsr, %1" : "=r" (*envp) : "i" (FE_ALL_EXCEPT));
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}
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#define libc_feholdexcept libc_feholdexcept_riscv
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#define libc_feholdexceptf libc_feholdexcept_riscv
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#define libc_feholdexceptl libc_feholdexcept_riscv
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static __always_inline void
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libc_fesetround_riscv (int round)
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{
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riscv_setround (round);
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}
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#define libc_fesetround libc_fesetround_riscv
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#define libc_fesetroundf libc_fesetround_riscv
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#define libc_fesetroundl libc_fesetround_riscv
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static __always_inline void
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libc_feholdexcept_setround_riscv (fenv_t *envp, int round)
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{
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libc_feholdexcept_riscv (envp);
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libc_fesetround_riscv (round);
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}
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#define libc_feholdexcept_setround libc_feholdexcept_setround_riscv
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#define libc_feholdexcept_setroundf libc_feholdexcept_setround_riscv
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#define libc_feholdexcept_setroundl libc_feholdexcept_setround_riscv
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static __always_inline int
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libc_fetestexcept_riscv (int ex)
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{
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return riscv_getflags () & ex;
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}
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#define libc_fetestexcept libc_fetestexcept_riscv
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#define libc_fetestexceptf libc_fetestexcept_riscv
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#define libc_fetestexceptl libc_fetestexcept_riscv
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static __always_inline void
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libc_fesetenv_riscv (const fenv_t *envp)
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{
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long int env = (long int) envp - (long int) FE_DFL_ENV;
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if (env != 0)
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env = *envp;
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_FPU_SETCW (env);
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}
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#define libc_fesetenv libc_fesetenv_riscv
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#define libc_fesetenvf libc_fesetenv_riscv
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#define libc_fesetenvl libc_fesetenv_riscv
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#define libc_feresetround_noex libc_fesetenv_riscv
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#define libc_feresetround_noexf libc_fesetenv_riscv
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#define libc_feresetround_noexl libc_fesetenv_riscv
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static __always_inline int
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libc_feupdateenv_test_riscv (const fenv_t *envp, int ex)
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{
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fenv_t env = *envp;
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int flags = riscv_getflags ();
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asm volatile ("csrw fcsr, %z0" : : "rJ" (env | flags));
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return flags & ex;
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}
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#define libc_feupdateenv_test libc_feupdateenv_test_riscv
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#define libc_feupdateenv_testf libc_feupdateenv_test_riscv
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#define libc_feupdateenv_testl libc_feupdateenv_test_riscv
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static __always_inline void
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libc_feupdateenv_riscv (const fenv_t *envp)
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{
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_FPU_SETCW (*envp | riscv_getflags ());
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}
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#define libc_feupdateenv libc_feupdateenv_riscv
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#define libc_feupdateenvf libc_feupdateenv_riscv
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#define libc_feupdateenvl libc_feupdateenv_riscv
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static __always_inline void
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libc_feholdsetround_riscv (fenv_t *envp, int round)
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{
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/* Note this implementation makes an improperly-formatted fenv_t and
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so should only be used in conjunction with libc_feresetround. */
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int old_round;
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asm volatile ("csrrw %0, frm, %z1" : "=r" (old_round) : "rJ" (round));
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*envp = old_round;
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}
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#define libc_feholdsetround libc_feholdsetround_riscv
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#define libc_feholdsetroundf libc_feholdsetround_riscv
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#define libc_feholdsetroundl libc_feholdsetround_riscv
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static __always_inline void
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libc_feresetround_riscv (fenv_t *envp)
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{
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/* Note this implementation takes an improperly-formatted fenv_t and
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so should only be used in conjunction with libc_feholdsetround. */
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riscv_setround (*envp);
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}
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#define libc_feresetround libc_feresetround_riscv
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#define libc_feresetroundf libc_feresetround_riscv
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#define libc_feresetroundl libc_feresetround_riscv
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#include_next <fenv_private.h>
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#endif
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