1 files changed, 29 insertions, 0 deletions
diff --git a/winsup/cygwin/math/rint.c b/winsup/cygwin/math/rint.c
new file mode 100644
index 000000000..01f9644b1
--- /dev/null
+++ b/winsup/cygwin/math/rint.c
@@ -0,0 +1,29 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+#include <math.h>
+
+#if defined(__arm__) || defined(_ARM_)
+/* This works around a compiler bug */
+double __rint_internal( double x );
+asm(".def __rint_internal; .scl 2; .type 32; .endef\n"
+    "\t.text\n"
+    "\t.align 4\n"
+    "\t.globl __rint_internal\n"
+    "__rint_internal:\n"
+    "\tvcvtr.s32.f64    s0, d0\n"
+    "\tvcvt.f64.s32     d0, s0\n"
+    "\tbx lr");
+#endif /* defined(__arm__) || defined(_ARM_) */
+
+double rint (double x) {
+  double retval = 0.0;
+#if defined(_AMD64_) || defined(__x86_64__) || defined(_X86_) || defined(__i386__)
+  __asm__ __volatile__ ("frndint;" : "=t" (retval) : "0" (x));
+#elif defined(__arm__) || defined(_ARM_)
+    retval = __rint_internal(x);
+#endif
+  return retval;
+}