1 files changed, 32 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/builtins/subsf3.c b/contrib/compiler-rt/lib/builtins/subsf3.c
new file mode 100644
index 000000000000..4b2786177dcc
--- /dev/null
+++ b/contrib/compiler-rt/lib/builtins/subsf3.c
@@ -0,0 +1,32 @@
+//===-- lib/subsf3.c - Single-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 single-precision soft-float subtraction with the
+// IEEE-754 default rounding (to nearest, ties to even).
+//
+//===----------------------------------------------------------------------===//
+
+#define SINGLE_PRECISION
+#include "fp_lib.h"
+
+// Subtraction; flip the sign bit of b and add.
+COMPILER_RT_ABI fp_t
+__subsf3(fp_t a, fp_t b) {
+    return __addsf3(a, fromRep(toRep(b) ^ signBit));
+}
+
+#if defined(__ARM_EABI__)
+#if defined(COMPILER_RT_ARMHF_TARGET)
+AEABI_RTABI fp_t __aeabi_fsub(fp_t a, fp_t b) {
+  return __subsf3(a, b);
+}
+#else
+AEABI_RTABI fp_t __aeabi_fsub(fp_t a, fp_t b) COMPILER_RT_ALIAS(__subsf3);
+#endif
+#endif