1 files changed, 41 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/floatdixf.c b/contrib/llvm-project/compiler-rt/lib/builtins/floatdixf.c
new file mode 100644
index 000000000000..ad5deb2d4bf5
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/floatdixf.c
@@ -0,0 +1,41 @@
+//===-- floatdixf.c - Implement __floatdixf -------------------------------===//
+//
+// 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 __floatdixf for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+
+// Returns: convert a to a long double, rounding toward even.
+
+// Assumption: long double is a IEEE 80 bit floating point type padded to 128
+// bits di_int is a 64 bit integral type
+
+// 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 long double __floatdixf(di_int a) {
+  if (a == 0)
+    return 0.0;
+  const unsigned N = sizeof(di_int) * CHAR_BIT;
+  const di_int s = a >> (N - 1);
+  a = (a ^ s) - s;
+  int clz = __builtin_clzll(a);
+  int e = (N - 1) - clz; // exponent
+  long_double_bits fb;
+  fb.u.high.s.low = ((su_int)s & 0x00008000) | // sign
+                    (e + 16383);               // exponent
+  fb.u.low.all = a << clz;                     // mantissa
+  return fb.f;
+}
+
+#endif // !_ARCH_PPC