IFC @ r222830

1 files changed, 30 insertions, 0 deletions

diff --git a/contrib/compiler-rt/lib/subdf3.c b/contrib/compiler-rt/lib/subdf3.c
new file mode 100644
index 0000000..825e3c6
--- /dev/null
+++ b/contrib/compiler-rt/lib/subdf3.c
@@ -0,0 +1,30 @@
+//===-- lib/adddf3.c - Double-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 double-precision soft-float subtraction with the
+// IEEE-754 default rounding (to nearest, ties to even).
+//
+//===----------------------------------------------------------------------===//
+#include "abi.h"
+
+#define DOUBLE_PRECISION
+#include "fp_lib.h"
+
+fp_t COMPILER_RT_ABI __adddf3(fp_t a, fp_t b);
+
+
+ARM_EABI_FNALIAS(dsub, subdf3);
+
+// Subtraction; flip the sign bit of b and add.
+COMPILER_RT_ABI fp_t
+__subdf3(fp_t a, fp_t b) {
+    return __adddf3(a, fromRep(toRep(b) ^ signBit));
+}
+
+/* FIXME: rsub for ARM EABI */