1 files changed, 44 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/fixunsxfti.c b/contrib/llvm-project/compiler-rt/lib/builtins/fixunsxfti.c
new file mode 100644
index 000000000000..be3f75f04f7f
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/fixunsxfti.c
@@ -0,0 +1,44 @@
+//===-- fixunsxfti.c - Implement __fixunsxfti -----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __fixunsxfti for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+#ifdef CRT_HAS_128BIT
+
+// Returns: convert a to a unsigned long long, rounding toward zero.
+//          Negative values all become zero.
+
+// Assumption: long double is an intel 80 bit floating point type padded with 6
+// bytes tu_int is a 128 bit integral type value in long double is representable
+// in tu_int or is negative
+
+// gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee
+// eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm
+// mmmm mmmm mmmm
+
+COMPILER_RT_ABI tu_int __fixunsxfti(xf_float a) {
+  xf_bits fb;
+  fb.f = a;
+  int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
+  if (e < 0 || (fb.u.high.s.low & 0x00008000))
+    return 0;
+  if ((unsigned)e > sizeof(tu_int) * CHAR_BIT)
+    return ~(tu_int)0;
+  tu_int r = fb.u.low.all;
+  if (e > 63)
+    r <<= (e - 63);
+  else
+    r >>= (63 - e);
+  return r;
+}
+
+#endif // CRT_HAS_128BIT