[PATCH 0/1] Fenv support for SPARC

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[PATCH 0/1] Fenv support for SPARC

Sourceware - newlib list mailing list
The Patch adds fenv support for SPARC.

The implemenation files are taken from NetBSD.

Eshan dhawan (1):
  SPARC fenv support

 newlib/configure.host                       |   1 +
 newlib/libc/machine/sparc/sys/fenv.h        |  85 +++++
 newlib/libm/machine/configure.in            |   1 +
 newlib/libm/machine/sparc/Makefile.am       |  21 ++
 newlib/libm/machine/sparc/configure.in      |  11 +
 newlib/libm/machine/sparc/feclearexcept.c   |   7 +
 newlib/libm/machine/sparc/fegetenv.c        |   7 +
 newlib/libm/machine/sparc/fegetexceptflag.c |   7 +
 newlib/libm/machine/sparc/fegetround.c      |   7 +
 newlib/libm/machine/sparc/feholdexcept.c    |   7 +
 newlib/libm/machine/sparc/fenv.c            | 350 ++++++++++++++++++++
 newlib/libm/machine/sparc/feraiseexcept.c   |   7 +
 newlib/libm/machine/sparc/fesetenv.c        |   7 +
 newlib/libm/machine/sparc/fesetexceptflag.c |   7 +
 newlib/libm/machine/sparc/fesetround.c      |   7 +
 newlib/libm/machine/sparc/fetestexcept.c    |   7 +
 newlib/libm/machine/sparc/feupdateenv.c     |   7 +
 17 files changed, 546 insertions(+)
 create mode 100644 newlib/libc/machine/sparc/sys/fenv.h
 create mode 100644 newlib/libm/machine/sparc/Makefile.am
 create mode 100644 newlib/libm/machine/sparc/configure.in
 create mode 100644 newlib/libm/machine/sparc/feclearexcept.c
 create mode 100644 newlib/libm/machine/sparc/fegetenv.c
 create mode 100644 newlib/libm/machine/sparc/fegetexceptflag.c
 create mode 100644 newlib/libm/machine/sparc/fegetround.c
 create mode 100644 newlib/libm/machine/sparc/feholdexcept.c
 create mode 100644 newlib/libm/machine/sparc/fenv.c
 create mode 100644 newlib/libm/machine/sparc/feraiseexcept.c
 create mode 100644 newlib/libm/machine/sparc/fesetenv.c
 create mode 100644 newlib/libm/machine/sparc/fesetexceptflag.c
 create mode 100644 newlib/libm/machine/sparc/fesetround.c
 create mode 100644 newlib/libm/machine/sparc/fetestexcept.c
 create mode 100644 newlib/libm/machine/sparc/feupdateenv.c

--
2.17.1

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[PATCH 1/1] SPARC fenv support

Sourceware - newlib list mailing list
Signed-off-by: Eshan dhawan <[hidden email]>
---
 newlib/configure.host                       |   1 +
 newlib/libc/machine/sparc/sys/fenv.h        |  85 +++++
 newlib/libm/machine/configure.in            |   1 +
 newlib/libm/machine/sparc/Makefile.am       |  21 ++
 newlib/libm/machine/sparc/configure.in      |  11 +
 newlib/libm/machine/sparc/feclearexcept.c   |   7 +
 newlib/libm/machine/sparc/fegetenv.c        |   7 +
 newlib/libm/machine/sparc/fegetexceptflag.c |   7 +
 newlib/libm/machine/sparc/fegetround.c      |   7 +
 newlib/libm/machine/sparc/feholdexcept.c    |   7 +
 newlib/libm/machine/sparc/fenv.c            | 350 ++++++++++++++++++++
 newlib/libm/machine/sparc/feraiseexcept.c   |   7 +
 newlib/libm/machine/sparc/fesetenv.c        |   7 +
 newlib/libm/machine/sparc/fesetexceptflag.c |   7 +
 newlib/libm/machine/sparc/fesetround.c      |   7 +
 newlib/libm/machine/sparc/fetestexcept.c    |   7 +
 newlib/libm/machine/sparc/feupdateenv.c     |   7 +
 17 files changed, 546 insertions(+)
 create mode 100644 newlib/libc/machine/sparc/sys/fenv.h
 create mode 100644 newlib/libm/machine/sparc/Makefile.am
 create mode 100644 newlib/libm/machine/sparc/configure.in
 create mode 100644 newlib/libm/machine/sparc/feclearexcept.c
 create mode 100644 newlib/libm/machine/sparc/fegetenv.c
 create mode 100644 newlib/libm/machine/sparc/fegetexceptflag.c
 create mode 100644 newlib/libm/machine/sparc/fegetround.c
 create mode 100644 newlib/libm/machine/sparc/feholdexcept.c
 create mode 100644 newlib/libm/machine/sparc/fenv.c
 create mode 100644 newlib/libm/machine/sparc/feraiseexcept.c
 create mode 100644 newlib/libm/machine/sparc/fesetenv.c
 create mode 100644 newlib/libm/machine/sparc/fesetexceptflag.c
 create mode 100644 newlib/libm/machine/sparc/fesetround.c
 create mode 100644 newlib/libm/machine/sparc/fetestexcept.c
 create mode 100644 newlib/libm/machine/sparc/feupdateenv.c

diff --git a/newlib/configure.host b/newlib/configure.host
index a84c0c80a..f31f8bd1a 100644
--- a/newlib/configure.host
+++ b/newlib/configure.host
@@ -321,6 +321,7 @@ case "${host_cpu}" in
  machine_dir=sh
  ;;
   sparc*)
+ libm_machine_dir=sparc
  machine_dir=sparc
  # FIXME: Might wish to make MALLOC_ALIGNMENT more generic.
  newlib_cflags="${newlib_cflags} -DMALLOC_ALIGNMENT=8"
diff --git a/newlib/libc/machine/sparc/sys/fenv.h b/newlib/libc/machine/sparc/sys/fenv.h
new file mode 100644
index 000000000..0d8fb13ea
--- /dev/null
+++ b/newlib/libc/machine/sparc/sys/fenv.h
@@ -0,0 +1,85 @@
+/* $NetBSD: fenv.h,v 1.2 2017/01/14 12:00:13 martin Exp $ */
+
+/*-
+ * Copyright (c) 2004-2005 David Schultz <[hidden email]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_FENV_H_
+#define _SYS_FENV_H_
+
+#include <stdint.h>
+
+#ifdef __arch64__
+typedef uint64_t fenv_t;
+typedef uint64_t fexcept_t;
+#else
+typedef uint32_t fenv_t;
+typedef uint32_t fexcept_t;
+#endif
+
+/*
+ * Exception flags
+ *
+ * Symbols are defined in such a way, to correspond to the accrued
+ * exception bits (aexc) fields of FSR.
+ */
+#define FE_INEXACT      0x00000020 /* 0000100000 */
+#define FE_DIVBYZERO    0x00000040 /* 0001000000 */
+#define FE_UNDERFLOW    0x00000080 /* 0010000000 */
+#define FE_OVERFLOW     0x00000100 /* 0100000000 */
+#define FE_INVALID 0x00000200 /* 1000000000 */
+
+#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
+    FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/*
+ * Rounding modes
+ *
+ * We can't just use the hardware bit values here, because that would
+ * make FE_UPWARD and FE_DOWNWARD negative, which is not allowed.
+ */
+#define FE_TONEAREST 0 /* round to nearest representable number */
+#define FE_TOWARDZERO 1 /* round to zero (truncate) */
+#define FE_UPWARD 2 /* round toward positive infinity */
+#define FE_DOWNWARD 3 /* round toward negative infinity */
+#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
+    FE_UPWARD | FE_TOWARDZERO)
+#define _ROUND_SHIFT 30
+
+
+
+/* Default floating-point environment */
+extern const fenv_t *_fe_dfl_env;
+#define FE_DFL_ENV _fe_dfl_env
+
+/* We need to be able to map status flag positions to mask flag positions */
+#define _FPUSW_SHIFT 18
+#define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
+
+
+
+#endif /* !_SYS_FENV_H_ */
diff --git a/newlib/libm/machine/configure.in b/newlib/libm/machine/configure.in
index d4635214a..b8cf52bef 100644
--- a/newlib/libm/machine/configure.in
+++ b/newlib/libm/machine/configure.in
@@ -33,6 +33,7 @@ if test -n "${libm_machine_dir}"; then
  spu) AC_CONFIG_SUBDIRS(spu) ;;
  riscv) AC_CONFIG_SUBDIRS(riscv) ;;
  x86_64) AC_CONFIG_SUBDIRS(x86_64) ;;
+ sparc) AC_CONFIG_SUBDIRS(sparc) ;;
   esac;
   if test "${use_libtool}" = "yes"; then
     machlib=${libm_machine_dir}/lib${libm_machine_dir}.${aext}
diff --git a/newlib/libm/machine/sparc/Makefile.am b/newlib/libm/machine/sparc/Makefile.am
new file mode 100644
index 000000000..34157760b
--- /dev/null
+++ b/newlib/libm/machine/sparc/Makefile.am
@@ -0,0 +1,21 @@
+## Process this file with automake to generate Makefile.in
+
+INCLUDES = -I $(newlib_basedir)/../newlib/libm/common $(NEWLIB_CFLAGS) \
+ $(CROSS_CFLAGS) $(TARGET_CFLAGS)
+
+LIB_SOURCES = \
+ feclearexcept.c  fegetenv.c fegetexceptflag.c \
+ fegetround.c feholdexcept.c feraiseexcept.c fesetenv.c \
+ fesetexceptflag.c fesetround.c fetestexcept.c feupdateenv.c \
+ fenv.c
+
+noinst_LIBRARIES = lib.a
+lib_a_SOURCES = $(LIB_SOURCES)
+lib_a_CFLAGS = $(AM_CFLAGS)
+lib_a_CCASFLAGS = $(AM_CCASFLAGS)
+noinst_DATA =
+
+include $(srcdir)/../../../Makefile.shared
+
+ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
+CONFIG_STATUS_DEPENDENCIES = $(newlib_basedir)/configure.host
diff --git a/newlib/libm/machine/sparc/configure.in b/newlib/libm/machine/sparc/configure.in
new file mode 100644
index 000000000..7a22fa31c
--- /dev/null
+++ b/newlib/libm/machine/sparc/configure.in
@@ -0,0 +1,11 @@
+
+AC_PREREQ(2.59)
+AC_INIT([newlib],[NEWLIB_VERSION])
+AC_CONFIG_SRCDIR([Makefile.am])
+
+AC_CONFIG_AUX_DIR(../../../..)
+
+NEWLIB_CONFIGURE(../../..)
+
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT
diff --git a/newlib/libm/machine/sparc/feclearexcept.c b/newlib/libm/machine/sparc/feclearexcept.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/feclearexcept.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fegetenv.c b/newlib/libm/machine/sparc/fegetenv.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/fegetenv.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fegetexceptflag.c b/newlib/libm/machine/sparc/fegetexceptflag.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/fegetexceptflag.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fegetround.c b/newlib/libm/machine/sparc/fegetround.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/fegetround.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/feholdexcept.c b/newlib/libm/machine/sparc/feholdexcept.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/feholdexcept.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fenv.c b/newlib/libm/machine/sparc/fenv.c
new file mode 100644
index 000000000..127898021
--- /dev/null
+++ b/newlib/libm/machine/sparc/fenv.c
@@ -0,0 +1,350 @@
+/* $NetBSD: fenv.c,v 1.2 2017/03/22 23:11:09 chs Exp $ */
+
+/*-
+ * Copyright (c) 2004-2005 David Schultz <[hidden email]>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ */
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: fenv.c,v 1.2 2017/03/22 23:11:09 chs Exp $");
+
+
+
+#include <assert.h>
+#include <fenv.h>
+
+#define _DIAGASSERT(x) assert(x)
+
+#ifdef __weak_alias
+__weak_alias(feclearexcept,_feclearexcept)
+__weak_alias(fedisableexcept,_fedisableexcept)
+__weak_alias(feenableexcept,_feenableexcept)
+__weak_alias(fegetenv,_fegetenv)
+__weak_alias(fegetexcept,_fegetexcept)
+__weak_alias(fegetexceptflag,_fegetexceptflag)
+__weak_alias(fegetround,_fegetround)
+__weak_alias(feholdexcept,_feholdexcept)
+__weak_alias(feraiseexcept,_feraiseexcept)
+__weak_alias(fesetenv,_fesetenv)
+__weak_alias(fesetexceptflag,_fesetexceptflag)
+__weak_alias(fesetround,_fesetround)
+__weak_alias(fetestexcept,_fetestexcept)
+__weak_alias(feupdateenv,_feupdateenv)
+#endif
+
+/* Load floating-point state register (32bits) */
+#define __ldfsr(__r) __asm__ __volatile__ \
+ ("ld %0, %%fsr" : : "m" (__r))
+
+/* Save floating-point state register (32bits) */
+#define __stfsr(__r) __asm__ __volatile__ \
+ ("st %%fsr, %0" : "=m" (*(__r)))
+
+/*
+ * The feclearexcept() function clears the supported floating-point exceptions
+ * represented by `excepts'.
+ */
+int
+feclearexcept(int excepts)
+{
+ fexcept_t r;
+ int ex;
+
+ _DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+ ex = excepts & FE_ALL_EXCEPT;
+
+ __stfsr(&r);
+ r &= ~ex;
+ __ldfsr(r);
+
+ /* Success */
+ return 0;
+}
+
+/*
+ * The fegetexceptflag() function stores an implementation-defined
+ * representation of the states of the floating-point status flags indicated
+ * by the argument excepts in the object pointed to by the argument flagp.
+ */
+int
+fegetexceptflag(fexcept_t *flagp, int excepts)
+{
+ fexcept_t r;
+ int ex;
+
+ _DIAGASSERT(flagp != NULL);
+ _DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+ ex = excepts & FE_ALL_EXCEPT;
+
+ __stfsr(&r);
+ *flagp = r & ex;
+
+ /* Success */
+ return 0;
+}
+
+
+/*
+ * This function sets the floating-point status flags indicated by the argument
+ * `excepts' to the states stored in the object pointed to by `flagp'. It does
+ * NOT raise any floating-point exceptions, but only sets the state of the flags.
+ */
+int
+fesetexceptflag(const fexcept_t *flagp, int excepts)
+{
+ fexcept_t r;
+ int ex;
+
+ _DIAGASSERT(flagp != NULL);
+ _DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+ ex = excepts & FE_ALL_EXCEPT;
+
+ __stfsr(&r);
+ r &= ~ex;
+ r |= *flagp & ex;
+ __ldfsr(r);
+
+ /* Success */
+ return 0;
+}
+
+/*
+ * The feraiseexcept() function raises the supported floating-point exceptions
+ * represented by the argument `excepts'.
+ *
+ * The order in which these floating-point exceptions are raised is unspecified
+ * (by the standard).
+ */
+int
+feraiseexcept(int excepts)
+{
+ volatile double d;
+ int ex;
+
+ _DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+ ex = excepts & FE_ALL_EXCEPT;
+
+ /*
+ * With a compiler that supports the FENV_ACCESS pragma properly, simple
+ * expressions like '0.0 / 0.0' should be sufficient to generate traps.
+ * Unfortunately, we need to bring a volatile variable into the equation
+ * to prevent incorrect optimizations.
+ */
+ if (ex & FE_INVALID) {
+ d = 0.0;
+ d = 0.0 / d;
+ }
+ if (ex & FE_DIVBYZERO) {
+ d = 0.0;
+ d = 1.0 / d;
+ }
+ if (ex & FE_OVERFLOW) {
+ d = 0x1.ffp1023;
+ d *= 2.0;
+ }
+ if (ex & FE_UNDERFLOW) {
+ d = 0x1p-1022;
+ d /= 0x1p1023;
+ }
+ if (ex & FE_INEXACT) {
+ d = 0x1p-1022;
+ d += 1.0;
+ }
+
+ /* Success */
+ return 0;
+}
+
+/*
+ * The fetestexcept() function determines which of a specified subset of the
+ * floating-point exception flags are currently set. The `excepts' argument
+ * specifies the floating-point status flags to be queried.
+ */
+int
+fetestexcept(int excepts)
+{
+ fexcept_t r;
+
+ _DIAGASSERT((excepts & ~FE_ALL_EXCEPT) == 0);
+
+ __stfsr(&r);
+
+ return r & (excepts & FE_ALL_EXCEPT);
+}
+
+/*
+ * The fegetround() function gets the current rounding direction.
+ */
+int
+fegetround(void)
+{
+ fenv_t r;
+
+ __stfsr(&r);
+
+ return (r >> _ROUND_SHIFT) & _ROUND_MASK;
+}
+
+/*
+ * The fesetround() function establishes the rounding direction represented by
+ * its argument `round'. If the argument is not equal to the value of a rounding
+ * direction macro, the rounding direction is not changed.
+ */
+int
+fesetround(int round)
+{
+ fenv_t r;
+
+ _DIAGASSERT((round & ~_ROUND_MASK) == 0);
+ if (round & ~_ROUND_MASK)
+ return -1;
+
+ __stfsr(&r);
+ r &= ~(_ROUND_MASK << _ROUND_SHIFT);
+ r |= round << _ROUND_SHIFT;
+ __ldfsr(r);
+
+ /* Success */
+ return 0;
+}
+
+/*
+ * The fegetenv() function attempts to store the current floating-point
+ * environment in the object pointed to by envp.
+ */
+int
+fegetenv(fenv_t *envp)
+{
+ _DIAGASSERT(envp != NULL);
+
+ __stfsr(envp);
+
+ /* Success */
+ return 0;
+}
+
+
+/*
+ * The feholdexcept() function saves the current floating-point environment
+ * in the object pointed to by envp, clears the floating-point status flags, and
+ * then installs a non-stop (continue on floating-point exceptions) mode, if
+ * available, for all floating-point exceptions.
+ */
+int
+feholdexcept(fenv_t *envp)
+{
+ fenv_t r;
+
+ _DIAGASSERT(envp != NULL);
+
+ __stfsr(&r);
+ *envp = r;
+ r &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
+ __ldfsr(r);
+
+ /* Success */
+ return 0;
+}
+
+/*
+ * The fesetenv() function attempts to establish the floating-point environment
+ * represented by the object pointed to by envp. The argument `envp' points
+ * to an object set by a call to fegetenv() or feholdexcept(), or equal a
+ * floating-point environment macro. The fesetenv() function does not raise
+ * floating-point exceptions, but only installs the state of the floating-point
+ * status flags represented through its argument.
+ */
+int
+fesetenv(const fenv_t *envp)
+{
+ _DIAGASSERT(envp != NULL);
+
+ __ldfsr(*envp);
+
+ /* Success */
+ return 0;
+}
+
+
+/*
+ * The feupdateenv() function saves the currently raised floating-point
+ * exceptions in its automatic storage, installs the floating-point environment
+ * represented by the object pointed to by `envp', and then raises the saved
+ * floating-point exceptions. The argument `envp' shall point to an object set
+ * by a call to feholdexcept() or fegetenv(), or equal a floating-point
+ * environment macro.
+ */
+int
+feupdateenv(const fenv_t *envp)
+{
+ fexcept_t r;
+
+ _DIAGASSERT(envp != NULL);
+
+ __stfsr(&r);
+ __ldfsr(*envp);
+
+ _DIAGASSERT((r & ~FE_ALL_EXCEPT) == 0);
+ feraiseexcept(r & FE_ALL_EXCEPT);
+
+ /* Success */
+ return 0;
+}
+
+/*
+ * The following functions are extentions to the standard
+ */
+int
+feenableexcept(int mask)
+{
+ fenv_t old_r, new_r;
+
+ __stfsr(&old_r);
+ new_r = old_r | ((mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+ __ldfsr(new_r);
+
+ return (old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT;
+}
+
+int
+fedisableexcept(int mask)
+{
+ fenv_t old_r, new_r;
+
+ __stfsr(&old_r);
+ new_r = old_r & ~((mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
+ __ldfsr(new_r);
+
+ return (old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT;
+}
+
+int
+fegetexcept(void)
+{
+ fenv_t r;
+
+ __stfsr(&r);
+ return (r & _ENABLE_MASK) >> _FPUSW_SHIFT;
+}
diff --git a/newlib/libm/machine/sparc/feraiseexcept.c b/newlib/libm/machine/sparc/feraiseexcept.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/feraiseexcept.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fesetenv.c b/newlib/libm/machine/sparc/fesetenv.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/fesetenv.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fesetexceptflag.c b/newlib/libm/machine/sparc/fesetexceptflag.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/fesetexceptflag.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fesetround.c b/newlib/libm/machine/sparc/fesetround.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/fesetround.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/fetestexcept.c b/newlib/libm/machine/sparc/fetestexcept.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/fetestexcept.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
diff --git a/newlib/libm/machine/sparc/feupdateenv.c b/newlib/libm/machine/sparc/feupdateenv.c
new file mode 100644
index 000000000..8cbee7771
--- /dev/null
+++ b/newlib/libm/machine/sparc/feupdateenv.c
@@ -0,0 +1,7 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * (c) Copyright 2019 Joel Sherrill <[hidden email]>
+ */
+
+#include "../../fenv/fenv_stub.c"
--
2.17.1

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Re: [PATCH 0/1] Fenv support for SPARC

Joel Sherrill
In reply to this post by Sourceware - newlib list mailing list
I should add that we although just tested on 32-bit SPARC (V7/V8),
it appears to have 64-bit (V9) support. Eshan plans to follow up with
a patch similar to add that which will be structurally similar to the
x86_64/i386 relationship for sharing the implementation.

--joel

On Wed, Jun 3, 2020 at 6:36 PM Eshan dhawan <[hidden email]> wrote:

> The Patch adds fenv support for SPARC.
>
> The implemenation files are taken from NetBSD.
>
> Eshan dhawan (1):
>   SPARC fenv support
>
>  newlib/configure.host                       |   1 +
>  newlib/libc/machine/sparc/sys/fenv.h        |  85 +++++
>  newlib/libm/machine/configure.in            |   1 +
>  newlib/libm/machine/sparc/Makefile.am       |  21 ++
>  newlib/libm/machine/sparc/configure.in      |  11 +
>  newlib/libm/machine/sparc/feclearexcept.c   |   7 +
>  newlib/libm/machine/sparc/fegetenv.c        |   7 +
>  newlib/libm/machine/sparc/fegetexceptflag.c |   7 +
>  newlib/libm/machine/sparc/fegetround.c      |   7 +
>  newlib/libm/machine/sparc/feholdexcept.c    |   7 +
>  newlib/libm/machine/sparc/fenv.c            | 350 ++++++++++++++++++++
>  newlib/libm/machine/sparc/feraiseexcept.c   |   7 +
>  newlib/libm/machine/sparc/fesetenv.c        |   7 +
>  newlib/libm/machine/sparc/fesetexceptflag.c |   7 +
>  newlib/libm/machine/sparc/fesetround.c      |   7 +
>  newlib/libm/machine/sparc/fetestexcept.c    |   7 +
>  newlib/libm/machine/sparc/feupdateenv.c     |   7 +
>  17 files changed, 546 insertions(+)
>  create mode 100644 newlib/libc/machine/sparc/sys/fenv.h
>  create mode 100644 newlib/libm/machine/sparc/Makefile.am
>  create mode 100644 newlib/libm/machine/sparc/configure.in
>  create mode 100644 newlib/libm/machine/sparc/feclearexcept.c
>  create mode 100644 newlib/libm/machine/sparc/fegetenv.c
>  create mode 100644 newlib/libm/machine/sparc/fegetexceptflag.c
>  create mode 100644 newlib/libm/machine/sparc/fegetround.c
>  create mode 100644 newlib/libm/machine/sparc/feholdexcept.c
>  create mode 100644 newlib/libm/machine/sparc/fenv.c
>  create mode 100644 newlib/libm/machine/sparc/feraiseexcept.c
>  create mode 100644 newlib/libm/machine/sparc/fesetenv.c
>  create mode 100644 newlib/libm/machine/sparc/fesetexceptflag.c
>  create mode 100644 newlib/libm/machine/sparc/fesetround.c
>  create mode 100644 newlib/libm/machine/sparc/fetestexcept.c
>  create mode 100644 newlib/libm/machine/sparc/feupdateenv.c
>
> --
> 2.17.1
>
>
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Re: [PATCH 1/1] SPARC fenv support

Sourceware - newlib list mailing list
In reply to this post by Sourceware - newlib list mailing list
On Jun  4 05:06, Eshan dhawan via Newlib wrote:

> Signed-off-by: Eshan dhawan <[hidden email]>
> ---
>  newlib/configure.host                       |   1 +
>  newlib/libc/machine/sparc/sys/fenv.h        |  85 +++++
>  newlib/libm/machine/configure.in            |   1 +
>  newlib/libm/machine/sparc/Makefile.am       |  21 ++
>  newlib/libm/machine/sparc/configure.in      |  11 +
>  newlib/libm/machine/sparc/feclearexcept.c   |   7 +
>  newlib/libm/machine/sparc/fegetenv.c        |   7 +
>  newlib/libm/machine/sparc/fegetexceptflag.c |   7 +
>  newlib/libm/machine/sparc/fegetround.c      |   7 +
>  newlib/libm/machine/sparc/feholdexcept.c    |   7 +
>  newlib/libm/machine/sparc/fenv.c            | 350 ++++++++++++++++++++
>  newlib/libm/machine/sparc/feraiseexcept.c   |   7 +
>  newlib/libm/machine/sparc/fesetenv.c        |   7 +
>  newlib/libm/machine/sparc/fesetexceptflag.c |   7 +
>  newlib/libm/machine/sparc/fesetround.c      |   7 +
>  newlib/libm/machine/sparc/fetestexcept.c    |   7 +
>  newlib/libm/machine/sparc/feupdateenv.c     |   7 +
>  17 files changed, 546 insertions(+)
>  create mode 100644 newlib/libc/machine/sparc/sys/fenv.h
>  create mode 100644 newlib/libm/machine/sparc/Makefile.am
>  create mode 100644 newlib/libm/machine/sparc/configure.in
>  create mode 100644 newlib/libm/machine/sparc/feclearexcept.c
>  create mode 100644 newlib/libm/machine/sparc/fegetenv.c
>  create mode 100644 newlib/libm/machine/sparc/fegetexceptflag.c
>  create mode 100644 newlib/libm/machine/sparc/fegetround.c
>  create mode 100644 newlib/libm/machine/sparc/feholdexcept.c
>  create mode 100644 newlib/libm/machine/sparc/fenv.c
>  create mode 100644 newlib/libm/machine/sparc/feraiseexcept.c
>  create mode 100644 newlib/libm/machine/sparc/fesetenv.c
>  create mode 100644 newlib/libm/machine/sparc/fesetexceptflag.c
>  create mode 100644 newlib/libm/machine/sparc/fesetround.c
>  create mode 100644 newlib/libm/machine/sparc/fetestexcept.c
>  create mode 100644 newlib/libm/machine/sparc/feupdateenv.c

This patch doesn't apply cleanly to git master.  Please check
and send a v2.


Corinna

--
Corinna Vinschen
Cygwin Maintainer
Red Hat