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commit 7e0b6763e96ef9706ea9ecc7fad83fc97b837913
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Author: Ian Bolton <ian.bolton@arm.com>
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Date: Wed Apr 16 14:41:52 2014 +0000
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[AArch64] Provide initial implementation of math_private.h.
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diff --git a/ports/sysdeps/aarch64/fpu/math_private.h b/ports/sysdeps/aarch64/fpu/math_private.h
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new file mode 100644
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index 0000000..dbf203d
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--- /dev/null
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+++ b/ports/sysdeps/aarch64/fpu/math_private.h
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@@ -0,0 +1,214 @@
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+/* Private floating point rounding and exceptions handling. AArch64 version.
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+ Copyright (C) 2014 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+ <http://www.gnu.org/licenses/>. */
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+
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+#ifndef AARCH64_MATH_PRIVATE_H
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+#define AARCH64_MATH_PRIVATE_H 1
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+
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+#include <fenv.h>
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+#include <fpu_control.h>
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+
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+static __always_inline void
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+libc_feholdexcept_aarch64 (fenv_t *envp)
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+{
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+ fpu_control_t fpcr, new_fpcr, fpsr, new_fpsr;
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+
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+ _FPU_GETCW (fpcr);
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+ _FPU_GETFPSR (fpsr);
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+ envp->__fpcr = fpcr;
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+ envp->__fpsr = fpsr;
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+
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+ /* Clear exception flags and set all exceptions to non-stop. */
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+ new_fpcr = fpcr & ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
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+ new_fpsr = fpsr & ~FE_ALL_EXCEPT;
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+
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+ if (__glibc_unlikely (new_fpcr != fpcr))
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+ _FPU_SETCW (new_fpcr);
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+
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+ if (new_fpsr != fpsr)
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+ _FPU_SETFPSR (new_fpsr);
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+}
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+
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+#define libc_feholdexcept libc_feholdexcept_aarch64
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+#define libc_feholdexceptf libc_feholdexcept_aarch64
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+#define libc_feholdexceptl libc_feholdexcept_aarch64
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+
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+static __always_inline void
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+libc_fesetround_aarch64 (int round)
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+{
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+ fpu_control_t fpcr;
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+
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+ _FPU_GETCW (fpcr);
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+
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+ /* Check whether rounding modes are different. */
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+ round = (fpcr ^ round) & FE_TOWARDZERO;
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+
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+ /* Set new rounding mode if different. */
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+ if (__glibc_unlikely (round != 0))
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+ _FPU_SETCW (fpcr ^ round);
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+}
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+
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+#define libc_fesetround libc_fesetround_aarch64
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+#define libc_fesetroundf libc_fesetround_aarch64
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+#define libc_fesetroundl libc_fesetround_aarch64
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+
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+static __always_inline void
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+libc_feholdexcept_setround_aarch64 (fenv_t *envp, int round)
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+{
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+ fpu_control_t fpcr, new_fpcr, fpsr, new_fpsr;
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+
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+ _FPU_GETCW (fpcr);
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+ _FPU_GETFPSR (fpsr);
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+ envp->__fpcr = fpcr;
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+ envp->__fpsr = fpsr;
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+
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+ /* Clear exception flags, set all exceptions to non-stop,
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+ and set new rounding mode. */
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+ new_fpcr = fpcr & ~((FE_ALL_EXCEPT << FE_EXCEPT_SHIFT) | FE_TOWARDZERO);
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+ new_fpcr |= round;
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+ new_fpsr = fpsr & ~FE_ALL_EXCEPT;
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+
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+ if (__glibc_unlikely (new_fpcr != fpcr))
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+ _FPU_SETCW (new_fpcr);
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+
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+ if (new_fpsr != fpsr)
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+ _FPU_SETFPSR (new_fpsr);
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+}
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+
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+#define libc_feholdexcept_setround libc_feholdexcept_setround_aarch64
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+#define libc_feholdexcept_setroundf libc_feholdexcept_setround_aarch64
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+#define libc_feholdexcept_setroundl libc_feholdexcept_setround_aarch64
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+
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+static __always_inline int
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+libc_fetestexcept_aarch64 (int ex)
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+{
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+ fpu_control_t fpsr;
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+
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+ _FPU_GETFPSR (fpsr);
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+ return fpsr & ex & FE_ALL_EXCEPT;
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+}
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+
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+#define libc_fetestexcept libc_fetestexcept_aarch64
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+#define libc_fetestexceptf libc_fetestexcept_aarch64
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+#define libc_fetestexceptl libc_fetestexcept_aarch64
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+
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+static __always_inline void
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+libc_fesetenv_aarch64 (const fenv_t *envp)
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+{
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+ fpu_control_t fpcr, new_fpcr;
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+
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+ _FPU_GETCW (fpcr);
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+ new_fpcr = envp->__fpcr;
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+
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+ if (__glibc_unlikely (fpcr != new_fpcr))
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+ _FPU_SETCW (new_fpcr);
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+
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+ _FPU_SETFPSR (envp->__fpsr);
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+}
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+
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+#define libc_fesetenv libc_fesetenv_aarch64
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+#define libc_fesetenvf libc_fesetenv_aarch64
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+#define libc_fesetenvl libc_fesetenv_aarch64
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+#define libc_feresetround_noex libc_fesetenv_aarch64
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+#define libc_feresetround_noexf libc_fesetenv_aarch64
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+#define libc_feresetround_noexl libc_fesetenv_aarch64
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+
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+static __always_inline int
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+libc_feupdateenv_test_aarch64 (const fenv_t *envp, int ex)
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+{
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+ fpu_control_t fpcr, new_fpcr, fpsr, new_fpsr;
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+ int excepts;
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+
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+ _FPU_GETCW (fpcr);
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+ _FPU_GETFPSR (fpsr);
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+
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+ /* Merge current exception flags with the saved fenv. */
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+ excepts = fpsr & FE_ALL_EXCEPT;
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+ new_fpcr = envp->__fpcr;
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+ new_fpsr = envp->__fpsr | excepts;
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+
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+ if (__glibc_unlikely (fpcr != new_fpcr))
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+ _FPU_SETCW (new_fpcr);
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+
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+ if (fpsr != new_fpsr)
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+ _FPU_SETFPSR (new_fpsr);
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+
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+ /* Raise the exceptions if enabled in the new FP state. */
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+ if (__glibc_unlikely (excepts & (new_fpcr >> FE_EXCEPT_SHIFT)))
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+ feraiseexcept (excepts);
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+
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+ return excepts & ex;
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+}
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+
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+#define libc_feupdateenv_test libc_feupdateenv_test_aarch64
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+#define libc_feupdateenv_testf libc_feupdateenv_test_aarch64
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+#define libc_feupdateenv_testl libc_feupdateenv_test_aarch64
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+
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+static __always_inline void
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+libc_feupdateenv_aarch64 (const fenv_t *envp)
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+{
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+ libc_feupdateenv_test_aarch64 (envp, 0);
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+}
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+
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+#define libc_feupdateenv libc_feupdateenv_aarch64
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+#define libc_feupdateenvf libc_feupdateenv_aarch64
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+#define libc_feupdateenvl libc_feupdateenv_aarch64
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+
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+static __always_inline void
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+libc_feholdsetround_aarch64 (fenv_t *envp, int round)
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+{
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+ fpu_control_t fpcr, fpsr;
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+
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+ _FPU_GETCW (fpcr);
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+ _FPU_GETFPSR (fpsr);
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+ envp->__fpcr = fpcr;
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+ envp->__fpsr = fpsr;
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+
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+ /* Check whether rounding modes are different. */
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+ round = (fpcr ^ round) & FE_TOWARDZERO;
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+
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+ /* Set new rounding mode if different. */
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+ if (__glibc_unlikely (round != 0))
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+ _FPU_SETCW (fpcr ^ round);
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+}
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+
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+#define libc_feholdsetround libc_feholdsetround_aarch64
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+#define libc_feholdsetroundf libc_feholdsetround_aarch64
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+#define libc_feholdsetroundl libc_feholdsetround_aarch64
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+
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+static __always_inline void
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+libc_feresetround_aarch64 (fenv_t *envp)
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+{
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+ fpu_control_t fpcr, round;
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+
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+ _FPU_GETCW (fpcr);
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+
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+ /* Check whether rounding modes are different. */
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+ round = (envp->__fpcr ^ fpcr) & FE_TOWARDZERO;
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+
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+ /* Restore the rounding mode if it was changed. */
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+ if (__glibc_unlikely (round != 0))
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+ _FPU_SETCW (fpcr ^ round);
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+}
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+
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+#define libc_feresetround libc_feresetround_aarch64
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+#define libc_feresetroundf libc_feresetround_aarch64
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+#define libc_feresetroundl libc_feresetround_aarch64
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+
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+#include_next <math_private.h>
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+
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+#endif
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