1 files changed, 39 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/ppc/floatunditf.c b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/floatunditf.c
new file mode 100644
index 000000000000..fb4cd3f91d86
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/floatunditf.c
@@ -0,0 +1,39 @@
+// 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
+
+// long double __floatunditf(unsigned long long x);
+// This file implements the PowerPC unsigned long long -> long double conversion
+
+#include "DD.h"
+
+long double __floatunditf(uint64_t a) {
+
+  // Begins with an exact copy of the code from __floatundidf
+
+  static const double twop52 = 0x1.0p52;
+  static const double twop84 = 0x1.0p84;
+  static const double twop84_plus_twop52 = 0x1.00000001p84;
+
+  doublebits high = {.d = twop84};
+  doublebits low = {.d = twop52};
+
+  high.x |= a >> 32;                         // 0x1.0p84 + high 32 bits of a
+  low.x |= a & UINT64_C(0x00000000ffffffff); // 0x1.0p52 + low 32 bits of a
+
+  const double high_addend = high.d - twop84_plus_twop52;
+
+  // At this point, we have two double precision numbers
+  // high_addend and low.d, and we wish to return their sum
+  // as a canonicalized long double:
+
+  // This implementation sets the inexact flag spuriously.
+  // This could be avoided, but at some substantial cost.
+
+  DD result;
+
+  result.s.hi = high_addend + low.d;
+  result.s.lo = (high_addend - result.s.hi) + low.d;
+
+  return result.ld;
+}