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| -rw-r--r-- | sysdeps/s390/fpu/fenv_private.h | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/sysdeps/s390/fpu/fenv_private.h b/sysdeps/s390/fpu/fenv_private.h new file mode 100644 index 0000000000..babb9e3123 --- /dev/null +++ b/sysdeps/s390/fpu/fenv_private.h @@ -0,0 +1,250 @@ +/* Private floating point rounding and exceptions handling. 390/s390x version. + Copyright (C) 2019 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 S390_FENV_PRIVATE_H +#define S390_FENV_PRIVATE_H 1 + +#include <fenv.h> +#include <fenv_libc.h> +#include <fpu_control.h> + +static __always_inline void +libc_feholdexcept_s390 (fenv_t *envp) +{ + fpu_control_t fpc, fpc_new; + + /* Store the environment. */ + _FPU_GETCW (fpc); + envp->__fpc = fpc; + + /* Clear the current exception flags and dxc field. + Hold from generating fpu exceptions temporarily. */ + fpc_new = fpc & ~(FPC_FLAGS_MASK | FPC_DXC_MASK | FPC_EXCEPTION_MASK); + + /* Only set new environment if it has changed. */ + if (fpc_new != fpc) + _FPU_SETCW (fpc_new); +} + +#define libc_feholdexcept libc_feholdexcept_s390 +#define libc_feholdexceptf libc_feholdexcept_s390 +#define libc_feholdexceptl libc_feholdexcept_s390 + +static __always_inline void +libc_fesetround_s390 (int round) +{ + __asm__ __volatile__ ("srnm 0(%0)" : : "a" (round)); +} + +#define libc_fesetround libc_fesetround_s390 +#define libc_fesetroundf libc_fesetround_s390 +#define libc_fesetroundl libc_fesetround_s390 + +static __always_inline void +libc_feholdexcept_setround_s390 (fenv_t *envp, int r) +{ + fpu_control_t fpc, fpc_new; + + _FPU_GETCW (fpc); + envp->__fpc = fpc; + + /* Clear the current exception flags and dxc field. + Hold from generating fpu exceptions temporarily. + Reset rounding mode bits. */ + fpc_new = fpc & ~(FPC_FLAGS_MASK | FPC_DXC_MASK | FPC_EXCEPTION_MASK + | FPC_RM_MASK); + + /* Set new rounding mode. */ + fpc_new |= (r & FPC_RM_MASK); + + /* Only set new environment if it has changed. */ + if (fpc_new != fpc) + _FPU_SETCW (fpc_new); +} + +#define libc_feholdexcept_setround libc_feholdexcept_setround_s390 +#define libc_feholdexcept_setroundf libc_feholdexcept_setround_s390 +#define libc_feholdexcept_setroundl libc_feholdexcept_setround_s390 + +static __always_inline int +libc_fetestexcept_s390 (int excepts) +{ + int res; + fexcept_t fpc; + + _FPU_GETCW (fpc); + + /* Get current exceptions. */ + res = (fpc >> FPC_FLAGS_SHIFT) & FE_ALL_EXCEPT; + if ((fpc & FPC_NOT_FPU_EXCEPTION) == 0) + /* Bits 6, 7 of dxc-byte are zero, + thus bits 0-5 of dxc-byte correspond to the flag-bits. + Evaluate flags and last dxc-exception-code. */ + res |= (fpc >> FPC_DXC_SHIFT) & FE_ALL_EXCEPT; + + return res & excepts; +} + +#define libc_fetestexcept libc_fetestexcept_s390 +#define libc_fetestexceptf libc_fetestexcept_s390 +#define libc_fetestexceptl libc_fetestexcept_s390 + +static __always_inline void +libc_fesetenv_s390 (const fenv_t *envp) +{ + _FPU_SETCW (envp->__fpc); +} + +#define libc_fesetenv libc_fesetenv_s390 +#define libc_fesetenvf libc_fesetenv_s390 +#define libc_fesetenvl libc_fesetenv_s390 + +static __always_inline int +libc_feupdateenv_test_s390 (const fenv_t *envp, int ex) +{ + /* Get the currently raised exceptions. */ + int excepts; + fexcept_t fpc_old; + + _FPU_GETCW (fpc_old); + + /* Get current exceptions. */ + excepts = (fpc_old >> FPC_FLAGS_SHIFT) & FE_ALL_EXCEPT; + if ((fpc_old & FPC_NOT_FPU_EXCEPTION) == 0) + /* Bits 6, 7 of dxc-byte are zero, + thus bits 0-5 of dxc-byte correspond to the flag-bits. + Evaluate flags and last dxc-exception-code. */ + excepts |= (fpc_old >> FPC_DXC_SHIFT) & FE_ALL_EXCEPT; + + /* Merge the currently raised exceptions with those in envp. */ + fpu_control_t fpc_new = envp->__fpc; + fpc_new |= excepts << FPC_FLAGS_SHIFT; + + /* Install the new fpc from envp. */ + if (fpc_new != fpc_old) + _FPU_SETCW (fpc_new); + + /* Raise the exceptions if enabled in new fpc. */ + if (__glibc_unlikely ((fpc_new >> FPC_EXCEPTION_MASK_SHIFT) & excepts)) + __feraiseexcept (excepts); + + return excepts & ex; +} + +#define libc_feupdateenv_test libc_feupdateenv_test_s390 +#define libc_feupdateenv_testf libc_feupdateenv_test_s390 +#define libc_feupdateenv_testl libc_feupdateenv_test_s390 + +static __always_inline void +libc_feupdateenv_s390 (const fenv_t *envp) +{ + libc_feupdateenv_test_s390 (envp, 0); +} + +#define libc_feupdateenv libc_feupdateenv_s390 +#define libc_feupdateenvf libc_feupdateenv_s390 +#define libc_feupdateenvl libc_feupdateenv_s390 + +static __always_inline fenv_t +libc_handle_user_fenv_s390 (const fenv_t *envp) +{ + fenv_t env; + if (envp == FE_DFL_ENV) + { + env.__fpc = _FPU_DEFAULT; + } + else if (envp == FE_NOMASK_ENV) + { + env.__fpc = FPC_EXCEPTION_MASK; + } + else + env = (*envp); + + return env; +} + +/* We have support for rounding mode context. */ +#define HAVE_RM_CTX 1 + +static __always_inline void +libc_feholdsetround_s390_ctx (struct rm_ctx *ctx, int r) +{ + fpu_control_t fpc; + int round; + + _FPU_GETCW (fpc); + ctx->env.__fpc = fpc; + + /* Check whether rounding modes are different. */ + round = fpc & FPC_RM_MASK; + + /* Set the rounding mode if changed. */ + if (__glibc_unlikely (round != r)) + { + ctx->updated_status = true; + libc_fesetround_s390 (r); + } + else + ctx->updated_status = false; +} + +#define libc_feholdsetround_ctx libc_feholdsetround_s390_ctx +#define libc_feholdsetroundf_ctx libc_feholdsetround_s390_ctx +#define libc_feholdsetroundl_ctx libc_feholdsetround_s390_ctx + +static __always_inline void +libc_feresetround_s390_ctx (struct rm_ctx *ctx) +{ + /* Restore the rounding mode if updated. */ + if (__glibc_unlikely (ctx->updated_status)) + { + fpu_control_t fpc; + _FPU_GETCW (fpc); + fpc = ctx->env.__fpc | (fpc & FPC_FLAGS_MASK); + _FPU_SETCW (fpc); + } +} + +#define libc_feresetround_ctx libc_feresetround_s390_ctx +#define libc_feresetroundf_ctx libc_feresetround_s390_ctx +#define libc_feresetroundl_ctx libc_feresetround_s390_ctx + +static __always_inline void +libc_feholdsetround_noex_s390_ctx (struct rm_ctx *ctx, int r) +{ + libc_feholdexcept_setround_s390 (&ctx->env, r); +} + +#define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_s390_ctx +#define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_s390_ctx +#define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_s390_ctx + +static __always_inline void +libc_feresetround_noex_s390_ctx (struct rm_ctx *ctx) +{ + /* Restore exception flags and rounding mode. */ + libc_fesetenv_s390 (&ctx->env); +} + +#define libc_feresetround_noex_ctx libc_feresetround_noex_s390_ctx +#define libc_feresetround_noexf_ctx libc_feresetround_noex_s390_ctx +#define libc_feresetround_noexl_ctx libc_feresetround_noex_s390_ctx + +#include_next <fenv_private.h> + +#endif |