diff options
Diffstat (limited to 'sysdeps/loongarch/math_private.h')
| -rw-r--r-- | sysdeps/loongarch/math_private.h | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/sysdeps/loongarch/math_private.h b/sysdeps/loongarch/math_private.h new file mode 100644 index 0000000000..cdf26a78dd --- /dev/null +++ b/sysdeps/loongarch/math_private.h @@ -0,0 +1,248 @@ +/* Internal math stuff. + Copyright (C) 2022 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 + <https://www.gnu.org/licenses/>. */ + +#ifndef LOONGARCH_MATH_PRIVATE_H +#define LOONGARCH_MATH_PRIVATE_H 1 + +/* Inline functions to speed up the math library implementation. The + default versions of these routines are in generic/math_private.h + and call fesetround, feholdexcept, etc. These routines use inlined + code instead. */ + +#ifdef __loongarch_hard_float + +#include <fenv.h> +#include <fenv_libc.h> +#include <fpu_control.h> + +#define _FPU_MASK_ALL \ + (_FPU_MASK_V | _FPU_MASK_Z | _FPU_MASK_O | _FPU_MASK_U | _FPU_MASK_I \ + | FE_ALL_EXCEPT) + +static __always_inline void +libc_feholdexcept_loongarch (fenv_t *envp) +{ + fpu_control_t cw; + + /* Save the current state. */ + _FPU_GETCW (cw); + envp->__fp_control_register = cw; + + /* Clear all exception enable bits and flags. */ + cw &= ~(_FPU_MASK_ALL); + _FPU_SETCW (cw); +} +#define libc_feholdexcept libc_feholdexcept_loongarch +#define libc_feholdexceptf libc_feholdexcept_loongarch +#define libc_feholdexceptl libc_feholdexcept_loongarch + +static __always_inline void +libc_fesetround_loongarch (int round) +{ + fpu_control_t cw; + + /* Get current state. */ + _FPU_GETCW (cw); + + /* Set rounding bits. */ + cw &= ~_FPU_RC_MASK; + cw |= round; + + /* Set new state. */ + _FPU_SETCW (cw); +} +#define libc_fesetround libc_fesetround_loongarch +#define libc_fesetroundf libc_fesetround_loongarch +#define libc_fesetroundl libc_fesetround_loongarch + +static __always_inline void +libc_feholdexcept_setround_loongarch (fenv_t *envp, int round) +{ + fpu_control_t cw; + + /* Save the current state. */ + _FPU_GETCW (cw); + envp->__fp_control_register = cw; + + /* Clear all exception enable bits and flags. */ + cw &= ~(_FPU_MASK_ALL); + + /* Set rounding bits. */ + cw &= ~_FPU_RC_MASK; + cw |= round; + + /* Set new state. */ + _FPU_SETCW (cw); +} +#define libc_feholdexcept_setround libc_feholdexcept_setround_loongarch +#define libc_feholdexcept_setroundf libc_feholdexcept_setround_loongarch +#define libc_feholdexcept_setroundl libc_feholdexcept_setround_loongarch + +#define libc_feholdsetround libc_feholdexcept_setround_loongarch +#define libc_feholdsetroundf libc_feholdexcept_setround_loongarch +#define libc_feholdsetroundl libc_feholdexcept_setround_loongarch + +static __always_inline void +libc_fesetenv_loongarch (fenv_t *envp) +{ + fpu_control_t cw __attribute__ ((unused)); + + /* Read current state to flush fpu pipeline. */ + _FPU_GETCW (cw); + + _FPU_SETCW (envp->__fp_control_register); +} +#define libc_fesetenv libc_fesetenv_loongarch +#define libc_fesetenvf libc_fesetenv_loongarch +#define libc_fesetenvl libc_fesetenv_loongarch + +static __always_inline int +libc_feupdateenv_test_loongarch (fenv_t *envp, int excepts) +{ + /* int ret = fetestexcept (excepts); feupdateenv (envp); return ret; */ + int cw, temp; + + /* Get current control word. */ + _FPU_GETCW (cw); + + /* Set flag bits (which are accumulative), and *also* set the + cause bits. The setting of the cause bits is what actually causes + the hardware to generate the exception, if the corresponding enable + bit is set as well. */ + temp = cw & FE_ALL_EXCEPT; + temp |= envp->__fp_control_register | (temp << CAUSE_SHIFT); + + /* Set new state. */ + _FPU_SETCW (temp); + + return cw & excepts & FE_ALL_EXCEPT; +} +#define libc_feupdateenv_test libc_feupdateenv_test_loongarch +#define libc_feupdateenv_testf libc_feupdateenv_test_loongarch +#define libc_feupdateenv_testl libc_feupdateenv_test_loongarch + +static __always_inline void +libc_feupdateenv_loongarch (fenv_t *envp) +{ + libc_feupdateenv_test_loongarch (envp, 0); +} +#define libc_feupdateenv libc_feupdateenv_loongarch +#define libc_feupdateenvf libc_feupdateenv_loongarch +#define libc_feupdateenvl libc_feupdateenv_loongarch + +#define libc_feresetround libc_feupdateenv_loongarch +#define libc_feresetroundf libc_feupdateenv_loongarch +#define libc_feresetroundl libc_feupdateenv_loongarch + +static __always_inline int +libc_fetestexcept_loongarch (int excepts) +{ + int cw; + + /* Get current control word. */ + _FPU_GETCW (cw); + + return cw & excepts & FE_ALL_EXCEPT; +} +#define libc_fetestexcept libc_fetestexcept_loongarch +#define libc_fetestexceptf libc_fetestexcept_loongarch +#define libc_fetestexceptl libc_fetestexcept_loongarch + +/* Enable support for rounding mode context. */ +#define HAVE_RM_CTX 1 + +static __always_inline void +libc_feholdexcept_setround_loongarch_ctx (struct rm_ctx *ctx, int round) +{ + fpu_control_t old, new; + + /* Save the current state. */ + _FPU_GETCW (old); + ctx->env.__fp_control_register = old; + + /* Clear all exception enable bits and flags. */ + new = old & ~(_FPU_MASK_ALL); + + /* Set rounding bits. */ + new = (new & ~_FPU_RC_MASK) | round; + + if (__glibc_unlikely (new != old)) + { + _FPU_SETCW (new); + ctx->updated_status = true; + } + else + ctx->updated_status = false; +} +#define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_loongarch_ctx +#define libc_feholdexcept_setroundf_ctx \ + libc_feholdexcept_setround_loongarch_ctx +#define libc_feholdexcept_setroundl_ctx \ + libc_feholdexcept_setround_loongarch_ctx + +static __always_inline void +libc_fesetenv_loongarch_ctx (struct rm_ctx *ctx) +{ + libc_fesetenv_loongarch (&ctx->env); +} +#define libc_fesetenv_ctx libc_fesetenv_loongarch_ctx +#define libc_fesetenvf_ctx libc_fesetenv_loongarch_ctx +#define libc_fesetenvl_ctx libc_fesetenv_loongarch_ctx + +static __always_inline void +libc_feupdateenv_loongarch_ctx (struct rm_ctx *ctx) +{ + if (__glibc_unlikely (ctx->updated_status)) + libc_feupdateenv_test_loongarch (&ctx->env, 0); +} +#define libc_feupdateenv_ctx libc_feupdateenv_loongarch_ctx +#define libc_feupdateenvf_ctx libc_feupdateenv_loongarch_ctx +#define libc_feupdateenvl_ctx libc_feupdateenv_loongarch_ctx +#define libc_feresetround_ctx libc_feupdateenv_loongarch_ctx +#define libc_feresetroundf_ctx libc_feupdateenv_loongarch_ctx +#define libc_feresetroundl_ctx libc_feupdateenv_loongarch_ctx + +static __always_inline void +libc_feholdsetround_loongarch_ctx (struct rm_ctx *ctx, int round) +{ + fpu_control_t old, new; + + /* Save the current state. */ + _FPU_GETCW (old); + ctx->env.__fp_control_register = old; + + /* Set rounding bits. */ + new = (old & ~_FPU_RC_MASK) | round; + + if (__glibc_unlikely (new != old)) + { + _FPU_SETCW (new); + ctx->updated_status = true; + } + else + ctx->updated_status = false; +} +#define libc_feholdsetround_ctx libc_feholdsetround_loongarch_ctx +#define libc_feholdsetroundf_ctx libc_feholdsetround_loongarch_ctx +#define libc_feholdsetroundl_ctx libc_feholdsetround_loongarch_ctx + +#endif + +#include_next <math_private.h> + +#endif |