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S390: Implement libc_fe* macros.
This patch provides the s390 specific implementation for libc_feholdexcept, libc_fesetround, libc_feholdexcept_setround, libc_fetestexcept, libc_fesetenv, libc_feupdateenv_test, libc_feupdateenv, libc_feholdsetround_ctx, libc_feresetround_ctx, libc_feholdsetround_noex_ctx and libc_feresetround_noex_ctx.
This commit is contained in:
Stefan Liebler
parent
7d42d614fd
commit
7c94d036c1
250
sysdeps/s390/fpu/fenv_private.h
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250
sysdeps/s390/fpu/fenv_private.h
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/* Private floating point rounding and exceptions handling. 390/s390x version.
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Copyright (C) 2019 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 S390_FENV_PRIVATE_H
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#define S390_FENV_PRIVATE_H 1
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#include <fenv.h>
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#include <fenv_libc.h>
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#include <fpu_control.h>
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static __always_inline void
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libc_feholdexcept_s390 (fenv_t *envp)
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{
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fpu_control_t fpc, fpc_new;
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/* Store the environment. */
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_FPU_GETCW (fpc);
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envp->__fpc = fpc;
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/* Clear the current exception flags and dxc field.
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Hold from generating fpu exceptions temporarily. */
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fpc_new = fpc & ~(FPC_FLAGS_MASK | FPC_DXC_MASK | FPC_EXCEPTION_MASK);
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/* Only set new environment if it has changed. */
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if (fpc_new != fpc)
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_FPU_SETCW (fpc_new);
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}
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#define libc_feholdexcept libc_feholdexcept_s390
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#define libc_feholdexceptf libc_feholdexcept_s390
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#define libc_feholdexceptl libc_feholdexcept_s390
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static __always_inline void
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libc_fesetround_s390 (int round)
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{
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__asm__ __volatile__ ("srnm 0(%0)" : : "a" (round));
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}
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#define libc_fesetround libc_fesetround_s390
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#define libc_fesetroundf libc_fesetround_s390
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#define libc_fesetroundl libc_fesetround_s390
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static __always_inline void
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libc_feholdexcept_setround_s390 (fenv_t *envp, int r)
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{
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fpu_control_t fpc, fpc_new;
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_FPU_GETCW (fpc);
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envp->__fpc = fpc;
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/* Clear the current exception flags and dxc field.
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Hold from generating fpu exceptions temporarily.
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Reset rounding mode bits. */
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fpc_new = fpc & ~(FPC_FLAGS_MASK | FPC_DXC_MASK | FPC_EXCEPTION_MASK
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| FPC_RM_MASK);
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/* Set new rounding mode. */
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fpc_new |= (r & FPC_RM_MASK);
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/* Only set new environment if it has changed. */
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if (fpc_new != fpc)
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_FPU_SETCW (fpc_new);
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}
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#define libc_feholdexcept_setround libc_feholdexcept_setround_s390
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#define libc_feholdexcept_setroundf libc_feholdexcept_setround_s390
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#define libc_feholdexcept_setroundl libc_feholdexcept_setround_s390
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static __always_inline int
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libc_fetestexcept_s390 (int excepts)
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{
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int res;
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fexcept_t fpc;
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_FPU_GETCW (fpc);
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/* Get current exceptions. */
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res = (fpc >> FPC_FLAGS_SHIFT) & FE_ALL_EXCEPT;
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if ((fpc & FPC_NOT_FPU_EXCEPTION) == 0)
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/* Bits 6, 7 of dxc-byte are zero,
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thus bits 0-5 of dxc-byte correspond to the flag-bits.
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Evaluate flags and last dxc-exception-code. */
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res |= (fpc >> FPC_DXC_SHIFT) & FE_ALL_EXCEPT;
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return res & excepts;
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}
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#define libc_fetestexcept libc_fetestexcept_s390
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#define libc_fetestexceptf libc_fetestexcept_s390
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#define libc_fetestexceptl libc_fetestexcept_s390
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static __always_inline void
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libc_fesetenv_s390 (const fenv_t *envp)
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{
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_FPU_SETCW (envp->__fpc);
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}
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#define libc_fesetenv libc_fesetenv_s390
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#define libc_fesetenvf libc_fesetenv_s390
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#define libc_fesetenvl libc_fesetenv_s390
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static __always_inline int
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libc_feupdateenv_test_s390 (const fenv_t *envp, int ex)
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{
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/* Get the currently raised exceptions. */
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int excepts;
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fexcept_t fpc_old;
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_FPU_GETCW (fpc_old);
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/* Get current exceptions. */
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excepts = (fpc_old >> FPC_FLAGS_SHIFT) & FE_ALL_EXCEPT;
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if ((fpc_old & FPC_NOT_FPU_EXCEPTION) == 0)
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/* Bits 6, 7 of dxc-byte are zero,
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thus bits 0-5 of dxc-byte correspond to the flag-bits.
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Evaluate flags and last dxc-exception-code. */
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excepts |= (fpc_old >> FPC_DXC_SHIFT) & FE_ALL_EXCEPT;
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/* Merge the currently raised exceptions with those in envp. */
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fpu_control_t fpc_new = envp->__fpc;
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fpc_new |= excepts << FPC_FLAGS_SHIFT;
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/* Install the new fpc from envp. */
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if (fpc_new != fpc_old)
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_FPU_SETCW (fpc_new);
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/* Raise the exceptions if enabled in new fpc. */
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if (__glibc_unlikely ((fpc_new >> FPC_EXCEPTION_MASK_SHIFT) & excepts))
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__feraiseexcept (excepts);
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return excepts & ex;
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}
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#define libc_feupdateenv_test libc_feupdateenv_test_s390
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#define libc_feupdateenv_testf libc_feupdateenv_test_s390
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#define libc_feupdateenv_testl libc_feupdateenv_test_s390
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static __always_inline void
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libc_feupdateenv_s390 (const fenv_t *envp)
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{
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libc_feupdateenv_test_s390 (envp, 0);
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}
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#define libc_feupdateenv libc_feupdateenv_s390
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#define libc_feupdateenvf libc_feupdateenv_s390
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#define libc_feupdateenvl libc_feupdateenv_s390
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static __always_inline fenv_t
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libc_handle_user_fenv_s390 (const fenv_t *envp)
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{
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fenv_t env;
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if (envp == FE_DFL_ENV)
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{
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env.__fpc = _FPU_DEFAULT;
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}
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else if (envp == FE_NOMASK_ENV)
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{
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env.__fpc = FPC_EXCEPTION_MASK;
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}
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else
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env = (*envp);
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return env;
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}
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/* We have support for rounding mode context. */
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#define HAVE_RM_CTX 1
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static __always_inline void
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libc_feholdsetround_s390_ctx (struct rm_ctx *ctx, int r)
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{
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fpu_control_t fpc;
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int round;
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_FPU_GETCW (fpc);
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ctx->env.__fpc = fpc;
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/* Check whether rounding modes are different. */
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round = fpc & FPC_RM_MASK;
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/* Set the rounding mode if changed. */
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if (__glibc_unlikely (round != r))
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{
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ctx->updated_status = true;
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libc_fesetround_s390 (r);
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}
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else
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ctx->updated_status = false;
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}
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#define libc_feholdsetround_ctx libc_feholdsetround_s390_ctx
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#define libc_feholdsetroundf_ctx libc_feholdsetround_s390_ctx
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#define libc_feholdsetroundl_ctx libc_feholdsetround_s390_ctx
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static __always_inline void
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libc_feresetround_s390_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 fpc;
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_FPU_GETCW (fpc);
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fpc = ctx->env.__fpc | (fpc & FPC_FLAGS_MASK);
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_FPU_SETCW (fpc);
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}
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}
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#define libc_feresetround_ctx libc_feresetround_s390_ctx
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#define libc_feresetroundf_ctx libc_feresetround_s390_ctx
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#define libc_feresetroundl_ctx libc_feresetround_s390_ctx
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static __always_inline void
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libc_feholdsetround_noex_s390_ctx (struct rm_ctx *ctx, int r)
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{
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libc_feholdexcept_setround_s390 (&ctx->env, r);
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}
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#define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_s390_ctx
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#define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_s390_ctx
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#define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_s390_ctx
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static __always_inline void
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libc_feresetround_noex_s390_ctx (struct rm_ctx *ctx)
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{
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/* Restore exception flags and rounding mode. */
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libc_fesetenv_s390 (&ctx->env);
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}
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#define libc_feresetround_noex_ctx libc_feresetround_noex_s390_ctx
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#define libc_feresetround_noexf_ctx libc_feresetround_noex_s390_ctx
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#define libc_feresetround_noexl_ctx libc_feresetround_noex_s390_ctx
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#include_next <fenv_private.h>
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#endif
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