1 files changed, 19 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/fesetround.c b/winsup/mingw/mingwex/fesetround.c
new file mode 100644
index 000000000..a8cef86a4
--- /dev/null
+++ b/winsup/mingw/mingwex/fesetround.c
@@ -0,0 +1,19 @@
+#include <fenv.h>
+ /* 7.6.3.2
+    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 mode)
+{
+  unsigned short _cw;
+  if ((mode & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO))
+      != 0)
+    return -1;
+  __asm__ volatile ("fnstcw %0;": "=m" (_cw));
+  _cw &= ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO);
+  _cw |= mode;
+  __asm__ volatile ("fldcw %0;" : : "m" (_cw));
+  return 0;
+}