1 files changed, 80 insertions, 0 deletions
diff --git a/newlib/libm/machine/riscv/fesetexceptflag.c b/newlib/libm/machine/riscv/fesetexceptflag.c
new file mode 100644
index 000000000..04400f4ff
--- /dev/null
+++ b/newlib/libm/machine/riscv/fesetexceptflag.c
@@ -0,0 +1,80 @@
+/*
+  (c) Copyright 2017 Michael R. Neilly
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+  * Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+  * 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.
+
+  * Neither the names of the copyright holders nor the names of their
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+  COPYRIGHT OWNER 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.
+*/
+
+#include <fenv.h>
+
+/* This implementation is intended to comply with the following
+ * specification:
+ *
+ * http://pubs.opengroup.org/onlinepubs/009695399/functions/fesetexceptflag.html
+ * Referred to as 'fesetexceptflag.html below.
+ *
+ * "The fesetexceptflag() function shall attempt to set the
+ * floating-point status flags indicated by the argument excepts to
+ * the states stored in the object pointed to by flagp. The value
+ * pointed to by flagp shall have been set by a previous call to
+ * fegetexceptflag() whose second argument represented at least those
+ * floating-point exceptions represented by the argument excepts. This
+ * function does not raise floating-point exceptions, but only sets
+ * the state of the flags."
+ *
+ */
+
+int fesetexceptflag(const fexcept_t *flagp, int excepts)
+{
+
+#if __riscv_flen
+
+  /* Mask excepts to be sure only supported flag bits are set */
+
+  excepts &= FE_ALL_EXCEPT;
+
+  /* Set the requested flags */
+
+  fexcept_t fflags = (excepts & *flagp);
+
+  /* Set new the flags */
+
+  asm volatile("csrs fflags, %0" : : "r"(fflags));
+
+  /* Per 'fesetexceptflag.html:
+   *
+   * "If the excepts argument is zero or if all the specified
+   * exceptions were successfully set, fesetexceptflag() shall return
+   * zero. Otherwise, it shall return a non-zero value."
+   */
+
+#endif
+
+  return 0;
+}