202 lines
6.7 KiB
C
202 lines
6.7 KiB
C
/* Private floating point rounding and exceptions handling. PowerPC version.
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Copyright (C) 2013-2022 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 POWERPC_FENV_PRIVATE_H
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#define POWERPC_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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#ifdef _ARCH_PWR8
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/* There is no performance advantage to non-stop mode. */
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/* The odd syntax here is to innocuously reference the given variables
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to prevent warnings about unused variables. */
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#define __TEST_AND_BEGIN_NON_STOP(old, new) do {} while ((old) * (new) * 0 != 0)
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#define __TEST_AND_END_NON_STOP(old, new) do {} while ((old) * (new) * 0 != 0)
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#else
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#define __TEST_AND_BEGIN_NON_STOP __TEST_AND_ENTER_NON_STOP
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#define __TEST_AND_END_NON_STOP __TEST_AND_EXIT_NON_STOP
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#endif
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static __always_inline void
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libc_feholdexcept_setround_ppc (fenv_t *envp, int r)
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{
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fenv_union_t old, new;
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old.fenv = *envp = fegetenv_register ();
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__TEST_AND_BEGIN_NON_STOP (old.l, 0ULL);
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/* Clear everything and set the rounding mode. */
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new.l = r;
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fesetenv_register (new.fenv);
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}
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static __always_inline unsigned long long
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__libc_femergeenv_ppc (const fenv_t *envp, unsigned long long old_mask,
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unsigned long long new_mask)
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{
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fenv_union_t old, new;
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new.fenv = *envp;
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old.fenv = fegetenv_register ();
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/* Merge bits while masking unwanted bits from new and old env. */
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new.l = (old.l & old_mask) | (new.l & new_mask);
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__TEST_AND_END_NON_STOP (old.l, new.l);
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__TEST_AND_BEGIN_NON_STOP (old.l, new.l);
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/* If requesting to keep status, replace control, and merge exceptions,
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and exceptions haven't changed, we can just set new control instead
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of the whole FPSCR. */
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if ((old_mask & (FPSCR_CONTROL_MASK|FPSCR_STATUS_MASK|FPSCR_EXCEPTIONS_MASK))
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== (FPSCR_STATUS_MASK|FPSCR_EXCEPTIONS_MASK) &&
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(new_mask & (FPSCR_CONTROL_MASK|FPSCR_STATUS_MASK|FPSCR_EXCEPTIONS_MASK))
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== (FPSCR_CONTROL_MASK|FPSCR_EXCEPTIONS_MASK) &&
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(old.l & FPSCR_EXCEPTIONS_MASK) == (new.l & FPSCR_EXCEPTIONS_MASK))
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{
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fesetenv_control (new.fenv);
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}
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else
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/* Atomically enable and raise (if appropriate) exceptions set in `new'. */
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fesetenv_register (new.fenv);
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return old.l;
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}
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static __always_inline void
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libc_fesetenv_ppc (const fenv_t *envp)
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{
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/* Replace the entire environment. */
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__libc_femergeenv_ppc (envp, 0LL, -1LL);
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}
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static __always_inline void
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libc_feresetround_ppc (fenv_t *envp)
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{
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fenv_union_t new = { .fenv = *envp };
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fegetenv_and_set_rn (new.l & FPSCR_RN_MASK);
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}
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static __always_inline int
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libc_feupdateenv_test_ppc (fenv_t *envp, int ex)
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{
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return __libc_femergeenv_ppc (envp, ~FPSCR_CONTROL_MASK,
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~FPSCR_STATUS_MASK) & ex;
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}
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static __always_inline void
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libc_feupdateenv_ppc (fenv_t *e)
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{
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libc_feupdateenv_test_ppc (e, 0);
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}
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#define libc_feholdexceptf libc_feholdexcept_ppc
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#define libc_feholdexcept libc_feholdexcept_ppc
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#define libc_feholdexcept_setroundf libc_feholdexcept_setround_ppc
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#define libc_feholdexcept_setround libc_feholdexcept_setround_ppc
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#define libc_fetestexceptf libc_fetestexcept_ppc
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#define libc_fetestexcept libc_fetestexcept_ppc
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#define libc_fesetroundf libc_fesetround_ppc
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#define libc_fesetround libc_fesetround_ppc
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#define libc_fesetenvf libc_fesetenv_ppc
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#define libc_fesetenv libc_fesetenv_ppc
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#define libc_feupdateenv_testf libc_feupdateenv_test_ppc
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#define libc_feupdateenv_test libc_feupdateenv_test_ppc
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#define libc_feupdateenvf libc_feupdateenv_ppc
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#define libc_feupdateenv libc_feupdateenv_ppc
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#define libc_feholdsetroundf libc_feholdsetround_ppc
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#define libc_feholdsetround libc_feholdsetround_ppc
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#define libc_feresetroundf libc_feresetround_ppc
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#define libc_feresetround libc_feresetround_ppc
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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_ppc_ctx (struct rm_ctx *ctx, int r)
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{
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fenv_union_t old;
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ctx->env = old.fenv = fegetenv_and_set_rn (r);
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ctx->updated_status = (r != (old.l & FPSCR_RN_MASK));
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}
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static __always_inline void
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libc_feholdsetround_noex_ppc_ctx (struct rm_ctx *ctx, int r)
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{
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fenv_union_t old, new;
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old.fenv = fegetenv_register ();
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new.l = (old.l & ~(FPSCR_ENABLES_MASK|FPSCR_RN_MASK)) | r;
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ctx->env = old.fenv;
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if (__glibc_unlikely (new.l != old.l))
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{
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__TEST_AND_BEGIN_NON_STOP (old.l, 0ULL);
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fesetenv_control (new.fenv);
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ctx->updated_status = true;
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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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static __always_inline void
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libc_fesetenv_ppc_ctx (struct rm_ctx *ctx)
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{
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libc_fesetenv_ppc (&ctx->env);
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}
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static __always_inline void
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libc_feupdateenv_ppc_ctx (struct rm_ctx *ctx)
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{
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if (__glibc_unlikely (ctx->updated_status))
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libc_feresetround_ppc (&ctx->env);
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}
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static __always_inline void
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libc_feresetround_ppc_ctx (struct rm_ctx *ctx)
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{
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if (__glibc_unlikely (ctx->updated_status))
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libc_feresetround_ppc (&ctx->env);
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}
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#define libc_fesetenv_ctx libc_fesetenv_ppc_ctx
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#define libc_fesetenvf_ctx libc_fesetenv_ppc_ctx
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#define libc_fesetenvl_ctx libc_fesetenv_ppc_ctx
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#define libc_feholdsetround_ctx libc_feholdsetround_ppc_ctx
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#define libc_feholdsetroundf_ctx libc_feholdsetround_ppc_ctx
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#define libc_feholdsetroundl_ctx libc_feholdsetround_ppc_ctx
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#define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_ppc_ctx
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#define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_ppc_ctx
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#define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_ppc_ctx
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#define libc_feresetround_ctx libc_feresetround_ppc_ctx
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#define libc_feresetroundf_ctx libc_feresetround_ppc_ctx
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#define libc_feresetroundl_ctx libc_feresetround_ppc_ctx
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#define libc_feupdateenv_ctx libc_feupdateenv_ppc_ctx
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#define libc_feupdateenvf_ctx libc_feupdateenv_ppc_ctx
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#define libc_feupdateenvl_ctx libc_feupdateenv_ppc_ctx
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#include_next <fenv_private.h>
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#endif
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