1 files changed, 71 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/floatundidf.c b/contrib/llvm-project/compiler-rt/lib/builtins/floatundidf.c
new file mode 100644
index 000000000000..9743e96ec679
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/floatundidf.c
@@ -0,0 +1,71 @@
+//===-- floatundidf.c - Implement __floatundidf ---------------------------===//
+//
+// 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 __floatundidf for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+// Returns: convert a to a double, rounding toward even.
+
+// Assumption: double is a IEEE 64 bit floating point type
+//             du_int is a 64 bit integral type
+
+// seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm
+// mmmm
+
+#include "int_lib.h"
+
+#ifndef __SOFTFP__
+// Support for systems that have hardware floating-point; we'll set the inexact
+// flag as a side-effect of this computation.
+
+COMPILER_RT_ABI double __floatundidf(du_int a) {
+  static const double twop52 = 4503599627370496.0;           // 0x1.0p52
+  static const double twop84 = 19342813113834066795298816.0; // 0x1.0p84
+  static const double twop84_plus_twop52 =
+      19342813118337666422669312.0; // 0x1.00000001p84
+
+  union {
+    uint64_t x;
+    double d;
+  } high = {.d = twop84};
+  union {
+    uint64_t x;
+    double d;
+  } low = {.d = twop52};
+
+  high.x |= a >> 32;
+  low.x |= a & UINT64_C(0x00000000ffffffff);
+
+  const double result = (high.d - twop84_plus_twop52) + low.d;
+  return result;
+}
+
+#else
+// Support for systems that don't have hardware floating-point; there are no
+// flags to set, and we don't want to code-gen to an unknown soft-float
+// implementation.
+
+#define SRC_U64
+#define DST_DOUBLE
+#include "int_to_fp_impl.inc"
+
+COMPILER_RT_ABI double __floatundidf(du_int a) { return __floatXiYf__(a); }
+#endif
+
+#if defined(__ARM_EABI__)
+#if defined(COMPILER_RT_ARMHF_TARGET)
+AEABI_RTABI double __aeabi_ul2d(du_int a) { return __floatundidf(a); }
+#else
+COMPILER_RT_ALIAS(__floatundidf, __aeabi_ul2d)
+#endif
+#endif
+
+#if defined(__MINGW32__) && defined(__arm__)
+COMPILER_RT_ALIAS(__floatundidf, __u64tod)
+#endif