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Diffstat (limited to 'sysdeps/riscv/rvf/math_private.h')
| -rw-r--r-- | sysdeps/riscv/rvf/math_private.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/sysdeps/riscv/rvf/math_private.h b/sysdeps/riscv/rvf/math_private.h new file mode 100644 index 0000000000..cdb7858fc8 --- /dev/null +++ b/sysdeps/riscv/rvf/math_private.h @@ -0,0 +1,161 @@ +/* Private floating point rounding and exceptions handling. RISC-V version. + Copyright (C) 2014-2018 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 RISCV_MATH_PRIVATE_H +#define RISCV_MATH_PRIVATE_H 1 + +#include <fenv.h> +#include <fpu_control.h> +#include <get-rounding-mode.h> + +static __always_inline int +riscv_getround (void) +{ + return get_rounding_mode (); +} + +static __always_inline void +riscv_setround (int rm) +{ + asm volatile ("fsrm %z0" : : "rJ" (rm)); +} + +static __always_inline int +riscv_getflags (void) +{ + int flags; + asm volatile ("frflags %0" : "=r" (flags)); + return flags; +} + +static __always_inline void +riscv_setflags (int flags) +{ + asm volatile ("fsflags %z0" : : "rJ" (flags)); +} + +static __always_inline void +libc_feholdexcept_riscv (fenv_t *envp) +{ + asm volatile ("csrrc %0, fcsr, %1" : "=r" (*envp) : "i" (FE_ALL_EXCEPT)); +} + +#define libc_feholdexcept libc_feholdexcept_riscv +#define libc_feholdexceptf libc_feholdexcept_riscv +#define libc_feholdexceptl libc_feholdexcept_riscv + +static __always_inline void +libc_fesetround_riscv (int round) +{ + riscv_setround (round); +} + +#define libc_fesetround libc_fesetround_riscv +#define libc_fesetroundf libc_fesetround_riscv +#define libc_fesetroundl libc_fesetround_riscv + +static __always_inline void +libc_feholdexcept_setround_riscv (fenv_t *envp, int round) +{ + libc_fesetround_riscv (round); + libc_feholdexcept_riscv (envp); +} + +#define libc_feholdexcept_setround libc_feholdexcept_setround_riscv +#define libc_feholdexcept_setroundf libc_feholdexcept_setround_riscv +#define libc_feholdexcept_setroundl libc_feholdexcept_setround_riscv + +static __always_inline int +libc_fetestexcept_riscv (int ex) +{ + return riscv_getflags () & ex; +} + +#define libc_fetestexcept libc_fetestexcept_riscv +#define libc_fetestexceptf libc_fetestexcept_riscv +#define libc_fetestexceptl libc_fetestexcept_riscv + +static __always_inline void +libc_fesetenv_riscv (const fenv_t *envp) +{ + long int env = (long int) envp - (long int) FE_DFL_ENV; + if (env != 0) + env = *envp; + + _FPU_SETCW (env); +} + +#define libc_fesetenv libc_fesetenv_riscv +#define libc_fesetenvf libc_fesetenv_riscv +#define libc_fesetenvl libc_fesetenv_riscv +#define libc_feresetround_noex libc_fesetenv_riscv +#define libc_feresetround_noexf libc_fesetenv_riscv +#define libc_feresetround_noexl libc_fesetenv_riscv + +static __always_inline int +libc_feupdateenv_test_riscv (const fenv_t *envp, int ex) +{ + fenv_t env = *envp; + int flags = riscv_getflags (); + asm volatile ("csrw fcsr, %z0" : : "rJ" (env | flags)); + return flags & ex; +} + +#define libc_feupdateenv_test libc_feupdateenv_test_riscv +#define libc_feupdateenv_testf libc_feupdateenv_test_riscv +#define libc_feupdateenv_testl libc_feupdateenv_test_riscv + +static __always_inline void +libc_feupdateenv_riscv (const fenv_t *envp) +{ + _FPU_SETCW (*envp | riscv_getflags ()); +} + +#define libc_feupdateenv libc_feupdateenv_riscv +#define libc_feupdateenvf libc_feupdateenv_riscv +#define libc_feupdateenvl libc_feupdateenv_riscv + +static __always_inline void +libc_feholdsetround_riscv (fenv_t *envp, int round) +{ + /* Note this implementation makes an improperly-formatted fenv_t and + so should only be used in conjunction with libc_feresetround. */ + int old_round; + asm volatile ("csrrw %0, frm, %z1" : "=r" (old_round) : "rJ" (round)); + *envp = old_round; +} + +#define libc_feholdsetround libc_feholdsetround_riscv +#define libc_feholdsetroundf libc_feholdsetround_riscv +#define libc_feholdsetroundl libc_feholdsetround_riscv + +static __always_inline void +libc_feresetround_riscv (fenv_t *envp) +{ + /* Note this implementation takes an improperly-formatted fenv_t and + so should only be used in conjunction with libc_feholdsetround. */ + riscv_setround (*envp); +} + +#define libc_feresetround libc_feresetround_riscv +#define libc_feresetroundf libc_feresetround_riscv +#define libc_feresetroundl libc_feresetround_riscv + +#include_next <math_private.h> + +#endif |