| /* Private floating point rounding and exceptions handling. PowerPC version. |
| Copyright (C) 2013-2014 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 FENV_PRIVATE_H |
| #define FENV_PRIVATE_H 1 |
| |
| #include <fenv.h> |
| #include <fenv_libc.h> |
| #include <fpu_control.h> |
| |
| #define _FPU_MASK_ALL (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM \ |
| | _FPU_MASK_XM | _FPU_MASK_IM) |
| |
| /* Mask everything but the rounding moded and non-IEEE arithmetic flags. */ |
| #define _FPU_MASK_ROUNDING 0xffffffff00000007LL |
| |
| /* Mask restore rounding mode and exception enabled. */ |
| #define _FPU_MASK_EXCEPT_ROUND 0xffffffff1fffff00LL |
| |
| /* Mask exception enable but fraction rounded/inexact and FP result/CC |
| bits. */ |
| #define _FPU_MASK_FRAC_INEX_RET_CC 0x1ff80fff |
| |
| static __always_inline void |
| libc_feholdexcept_ppc (fenv_t *envp) |
| { |
| fenv_union_t old, new; |
| |
| old.fenv = *envp = fegetenv_register (); |
| |
| new.l = old.l & _FPU_MASK_ROUNDING; |
| |
| /* If the old env had any enabled exceptions, then mask SIGFPE in the |
| MSR FE0/FE1 bits. This may allow the FPU to run faster because it |
| always takes the default action and can not generate SIGFPE. */ |
| if ((old.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_mask_env (); |
| |
| fesetenv_register (new.fenv); |
| } |
| |
| static __always_inline void |
| libc_fesetround_ppc (int r) |
| { |
| __fesetround (r); |
| } |
| |
| static __always_inline void |
| libc_feholdexcept_setround_ppc (fenv_t *envp, int r) |
| { |
| fenv_union_t old, new; |
| |
| old.fenv = *envp = fegetenv_register (); |
| |
| new.l = (old.l & _FPU_MASK_ROUNDING) | r; |
| |
| if ((old.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_mask_env (); |
| |
| fesetenv_register (new.fenv); |
| } |
| |
| static __always_inline int |
| libc_fetestexcept_ppc (int e) |
| { |
| fenv_union_t u; |
| u.fenv = fegetenv_register (); |
| return u.l & e; |
| } |
| |
| static __always_inline void |
| libc_fesetenv_ppc (const fenv_t *envp) |
| { |
| fenv_union_t old, new; |
| |
| new.fenv = *envp; |
| old.fenv = fegetenv_register (); |
| |
| /* If the old env has no enabled exceptions and the new env has any enabled |
| exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits. This will put the |
| hardware into "precise mode" and may cause the FPU to run slower on some |
| hardware. */ |
| if ((old.l & _FPU_MASK_ALL) == 0 && (new.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_nomask_env_priv (); |
| |
| /* If the old env had any enabled exceptions and the new env has no enabled |
| exceptions, then mask SIGFPE in the MSR FE0/FE1 bits. This may allow the |
| FPU to run faster because it always takes the default action and can not |
| generate SIGFPE. */ |
| if ((old.l & _FPU_MASK_ALL) != 0 && (new.l & _FPU_MASK_ALL) == 0) |
| (void) __fe_mask_env (); |
| |
| fesetenv_register (*envp); |
| } |
| |
| static __always_inline int |
| libc_feupdateenv_test_ppc (fenv_t *envp, int ex) |
| { |
| fenv_union_t old, new; |
| |
| new.fenv = *envp; |
| old.fenv = fegetenv_register (); |
| |
| /* Restore rounding mode and exception enable from *envp and merge |
| exceptions. Leave fraction rounded/inexact and FP result/CC bits |
| unchanged. */ |
| new.l = (old.l & _FPU_MASK_EXCEPT_ROUND) |
| | (new.l & _FPU_MASK_FRAC_INEX_RET_CC); |
| |
| if ((old.l & _FPU_MASK_ALL) == 0 && (new.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_nomask_env_priv (); |
| |
| if ((old.l & _FPU_MASK_ALL) != 0 && (new.l & _FPU_MASK_ALL) == 0) |
| (void) __fe_mask_env (); |
| |
| fesetenv_register (new.fenv); |
| |
| return old.l & ex; |
| } |
| |
| static __always_inline void |
| libc_feupdateenv_ppc (fenv_t *e) |
| { |
| libc_feupdateenv_test_ppc (e, 0); |
| } |
| |
| static __always_inline void |
| libc_feholdsetround_ppc (fenv_t *e, int r) |
| { |
| fenv_union_t old, new; |
| |
| old.fenv = fegetenv_register (); |
| /* Clear current precision and set newer one. */ |
| new.l = (old.l & ~0x3) | r; |
| *e = old.fenv; |
| |
| if ((old.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_mask_env (); |
| fesetenv_register (new.fenv); |
| } |
| |
| static __always_inline void |
| libc_feresetround_ppc (fenv_t *envp) |
| { |
| fenv_union_t old, new; |
| |
| new.fenv = *envp; |
| old.fenv = fegetenv_register (); |
| |
| /* Restore rounding mode and exception enable from *envp and merge |
| exceptions. Leave fraction rounded/inexact and FP result/CC bits |
| unchanged. */ |
| new.l = (old.l & _FPU_MASK_EXCEPT_ROUND) |
| | (new.l & _FPU_MASK_FRAC_INEX_RET_CC); |
| |
| if ((old.l & _FPU_MASK_ALL) == 0 && (new.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_nomask_env_priv (); |
| |
| if ((old.l & _FPU_MASK_ALL) != 0 && (new.l & _FPU_MASK_ALL) == 0) |
| (void) __fe_mask_env (); |
| |
| /* Atomically enable and raise (if appropriate) exceptions set in `new'. */ |
| fesetenv_register (new.fenv); |
| } |
| |
| #define libc_feholdexceptf libc_feholdexcept_ppc |
| #define libc_feholdexcept libc_feholdexcept_ppc |
| #define libc_feholdexcept_setroundf libc_feholdexcept_setround_ppc |
| #define libc_feholdexcept_setround libc_feholdexcept_setround_ppc |
| #define libc_fetestexceptf libc_fetestexcept_ppc |
| #define libc_fetestexcept libc_fetestexcept_ppc |
| #define libc_fesetroundf libc_fesetround_ppc |
| #define libc_fesetround libc_fesetround_ppc |
| #define libc_fesetenvf libc_fesetenv_ppc |
| #define libc_fesetenv libc_fesetenv_ppc |
| #define libc_feupdateenv_testf libc_feupdateenv_test_ppc |
| #define libc_feupdateenv_test libc_feupdateenv_test_ppc |
| #define libc_feupdateenvf libc_feupdateenv_ppc |
| #define libc_feupdateenv libc_feupdateenv_ppc |
| #define libc_feholdsetroundf libc_feholdsetround_ppc |
| #define libc_feholdsetround libc_feholdsetround_ppc |
| #define libc_feresetroundf libc_feresetround_ppc |
| #define libc_feresetround libc_feresetround_ppc |
| |
| |
| /* We have support for rounding mode context. */ |
| #define HAVE_RM_CTX 1 |
| |
| static __always_inline void |
| libc_feholdexcept_setround_ppc_ctx (struct rm_ctx *ctx, int r) |
| { |
| fenv_union_t old, new; |
| |
| old.fenv = fegetenv_register (); |
| |
| new.l = (old.l & _FPU_MASK_ROUNDING) | r; |
| ctx->env = old.fenv; |
| if (__glibc_unlikely (new.l != old.l)) |
| { |
| if ((old.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_mask_env (); |
| fesetenv_register (new.fenv); |
| ctx->updated_status = true; |
| } |
| else |
| ctx->updated_status = false; |
| } |
| |
| static __always_inline void |
| libc_fesetenv_ppc_ctx (struct rm_ctx *ctx) |
| { |
| libc_fesetenv_ppc (&ctx->env); |
| } |
| |
| static __always_inline void |
| libc_feupdateenv_ppc_ctx (struct rm_ctx *ctx) |
| { |
| if (__glibc_unlikely (ctx->updated_status)) |
| libc_feupdateenv_test_ppc (&ctx->env, 0); |
| } |
| |
| static __always_inline void |
| libc_feholdsetround_ppc_ctx (struct rm_ctx *ctx, int r) |
| { |
| fenv_union_t old, new; |
| |
| old.fenv = fegetenv_register (); |
| new.l = (old.l & ~0x3) | r; |
| ctx->env = old.fenv; |
| if (__glibc_unlikely (new.l != old.l)) |
| { |
| if ((old.l & _FPU_MASK_ALL) != 0) |
| (void) __fe_mask_env (); |
| fesetenv_register (new.fenv); |
| ctx->updated_status = true; |
| } |
| else |
| ctx->updated_status = false; |
| } |
| |
| static __always_inline void |
| libc_feresetround_ppc_ctx (struct rm_ctx *ctx) |
| { |
| if (__glibc_unlikely (ctx->updated_status)) |
| libc_feresetround_ppc (&ctx->env); |
| } |
| |
| #define libc_feholdexcept_setroundf_ctx libc_feholdexcept_setround_ppc_ctx |
| #define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_ppc_ctx |
| #define libc_fesetenv_ctx libc_fesetenv_ppc_ctx |
| #define libc_fesetenvf_ctx libc_fesetenv_ppc_ctx |
| #define libc_feholdsetround_ctx libc_feholdsetround_ppc_ctx |
| #define libc_feholdsetroundf_ctx libc_feholdsetround_ppc_ctx |
| #define libc_feresetround_ctx libc_feresetround_ppc_ctx |
| #define libc_feresetroundf_ctx libc_feresetround_ppc_ctx |
| #define libc_feupdateenvf_ctx libc_feupdateenv_ppc_ctx |
| #define libc_feupdateenv_ctx libc_feupdateenv_ppc_ctx |
| |
| #endif |
