1 files changed, 49 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/floatsitf.c b/contrib/llvm-project/compiler-rt/lib/builtins/floatsitf.c
new file mode 100644
index 000000000000..314a8a7bbdfe
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/floatsitf.c
@@ -0,0 +1,49 @@
+//===-- lib/floatsitf.c - integer -> quad-precision conversion ----*- 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 integer to quad-precision conversion for the
+// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
+// mode.
+//
+//===----------------------------------------------------------------------===//
+
+#define QUAD_PRECISION
+#include "fp_lib.h"
+
+#if defined(CRT_HAS_TF_MODE)
+COMPILER_RT_ABI fp_t __floatsitf(si_int a) {
+
+  const int aWidth = sizeof a * CHAR_BIT;
+
+  // Handle zero as a special case to protect clz
+  if (a == 0)
+    return fromRep(0);
+
+  // All other cases begin by extracting the sign and absolute value of a
+  rep_t sign = 0;
+  su_int aAbs = (su_int)a;
+  if (a < 0) {
+    sign = signBit;
+    aAbs = -aAbs;
+  }
+
+  // Exponent of (fp_t)a is the width of abs(a).
+  const int exponent = (aWidth - 1) - clzsi(aAbs);
+  rep_t result;
+
+  // Shift a into the significand field and clear the implicit bit.
+  const int shift = significandBits - exponent;
+  result = (rep_t)aAbs << shift ^ implicitBit;
+
+  // Insert the exponent
+  result += (rep_t)(exponent + exponentBias) << significandBits;
+  // Insert the sign bit and return
+  return fromRep(result | sign);
+}
+
+#endif