1 files changed, 38 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/ppc/fixtfti.c b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/fixtfti.c
new file mode 100644
index 000000000000..4180e7494d3b
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/fixtfti.c
@@ -0,0 +1,38 @@
+//===--- lib/builtins/ppc/fixtfti.c - Convert long double->int128 *-C -*---===//
+//
+// 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 converting the 128bit IBM/PowerPC long double (double-
+// double) data type to a signed 128 bit integer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "../int_math.h"
+
+// Convert long double into a signed 128-bit integer.
+__int128_t __fixtfti(long double input) {
+
+  // If we are trying to convert a NaN, return the NaN bit pattern.
+  if (crt_isnan(input)) {
+    return ((__uint128_t)0x7FF8000000000000ll) << 64 |
+           (__uint128_t)0x0000000000000000ll;
+  }
+
+  // Note: overflow is an undefined behavior for this conversion.
+  // For this reason, overflow is not checked here.
+
+  // If the long double is negative, use unsigned conversion from its absolute
+  // value.
+  if (input < 0.0) {
+    __uint128_t result = (__uint128_t)(-input);
+    return -((__int128_t)result);
+  }
+
+  // Otherwise, use unsigned conversion from the input value.
+  __uint128_t result = (__uint128_t)input;
+  return result;
+}