1 files changed, 25 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/absvsi2.c b/compiler-rt/lib/builtins/absvsi2.c
new file mode 100644
index 000000000000..44ada169e7e6
--- /dev/null
+++ b/compiler-rt/lib/builtins/absvsi2.c
@@ -0,0 +1,25 @@
+//===-- absvsi2.c - Implement __absvsi2 -----------------------------------===//
+//
+// 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 __absvsi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: absolute value
+
+// Effects: aborts if abs(x) < 0
+
+COMPILER_RT_ABI si_int __absvsi2(si_int a) {
+  const int N = (int)(sizeof(si_int) * CHAR_BIT);
+  if (a == (1 << (N - 1)))
+    compilerrt_abort();
+  const si_int t = a >> (N - 1);
+  return (a ^ t) - t;
+}