arm: add fenv support from glibc

1 files changed, 35 insertions, 0 deletions

diff --git a/libm/arm/fesetround.c b/libm/arm/fesetround.c
new file mode 100644
index 000000000..1cb6b366c
--- /dev/null
+++ b/libm/arm/fesetround.c
@@ -0,0 +1,35 @@
+/* Set current rounding direction.
+   Copyright (C) 2004-2025 Free Software Foundation, Inc.
+
+   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/>.  */
+
+#include "fenv_private.h"
+#include "arm-features.h"
+
+
+int
+fesetround (int round)
+{
+  /* FE_TONEAREST is the only supported rounding mode
+     if a VFP unit isn't present.  */
+  if (!ARM_HAVE_VFP)
+    return (round == FE_TONEAREST) ? 0 : 1;
+
+  if (round & ~_FPU_MASK_RM)
+    return 1;
+
+  libc_fesetround_vfp (round);
+  return 0;
+}