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-rw-r--r--lib/builtins/subtf3.c27
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diff --git a/lib/builtins/subtf3.c b/lib/builtins/subtf3.c
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+//===-- lib/subtf3.c - Quad-precision subtraction -----------------*- C -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements quad-precision soft-float subtraction with the
+// IEEE-754 default rounding (to nearest, ties to even).
+//
+//===----------------------------------------------------------------------===//
+
+#define QUAD_PRECISION
+#include "fp_lib.h"
+
+#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
+COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b);
+
+// Subtraction; flip the sign bit of b and add.
+COMPILER_RT_ABI fp_t
+__subtf3(fp_t a, fp_t b) {
+ return __addtf3(a, fromRep(toRep(b) ^ signBit));
+}
+
+#endif