From: Stefan Liebler <stli@linux.ibm.com>
To: libc-alpha@sourceware.org
Cc: Stefan Liebler <stli@linux.ibm.com>
Subject: [PATCH 13/17] S390: Implement libc_fe* macros.
Date: Mon, 04 Nov 2019 15:28:00 -0000 [thread overview]
Message-ID: <1572881244-6781-13-git-send-email-stli@linux.ibm.com> (raw)
In-Reply-To: <1572881244-6781-1-git-send-email-stli@linux.ibm.com>
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.
---
sysdeps/s390/fpu/fenv_private.h | 250 ++++++++++++++++++++++++++++++++
1 file changed, 250 insertions(+)
create mode 100644 sysdeps/s390/fpu/fenv_private.h
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
--
2.19.1
next prev parent reply other threads:[~2019-11-04 15:28 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 15:28 [PATCH 01/17] S390: Use load-fp-integer instruction for nearbyint functions Stefan Liebler
2019-11-04 15:28 ` [PATCH 15/17] S390: Implement math-barriers math_opt_barrier and math_force_eval Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 04/17] S390: Use load-fp-integer instruction for ceil functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 17/17] S390: Use sysdeps/ieee754/dbl-64/wordsize-64 on s390x Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` Stefan Liebler [this message]
2019-12-02 14:58 ` [PATCH 13/17] S390: Implement libc_fe* macros Stefan Liebler
2019-11-04 15:28 ` [PATCH 10/17] S390: Use convert-to-fixed instruction for lround functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 12/17] S390: Use copy-sign instruction for copysign functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 07/17] S390: Use load-fp-integer instruction for roundeven functions Stefan Liebler
2019-12-02 15:04 ` Stefan Liebler
2019-12-11 14:18 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 08/17] S390: Use convert-to-fixed instruction for lrint functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 06/17] S390: Use load-fp-integer instruction for round functions Stefan Liebler
2019-12-02 14:58 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 03/17] S390: Use load-fp-integer instruction for floor functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 15:28 ` [PATCH 05/17] S390: Use load-fp-integer instruction for trunc functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:49 ` [PATCH 16/17] S390: Implement roundtoint and converttoint and define TOINT_INTRINSICS Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 15:54 ` [PATCH 02/17] S390: Use load-fp-integer instruction for rint functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 16:04 ` [PATCH 14/17] S390: Use libc_fe* macros in fe* functions Stefan Liebler
2019-12-02 14:56 ` Stefan Liebler
2019-11-04 16:27 ` [PATCH 11/17] S390: Use convert-to-fixed instruction for llround functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 16:28 ` [PATCH 09/17] S390: Use convert-to-fixed instruction for llrint functions Stefan Liebler
2019-12-02 14:57 ` Stefan Liebler
2019-11-04 18:22 ` [PATCH 01/17] S390: Use load-fp-integer instruction for nearbyint functions Adhemerval Zanella
2019-11-05 15:49 ` Stefan Liebler
2019-11-05 16:48 ` Joseph Myers
2019-11-05 18:55 ` Adhemerval Zanella
2019-12-02 14:56 ` Stefan Liebler
2019-12-02 15:20 ` Adhemerval Zanella
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