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diff --git a/lib/builtins/arm/floatsidfvfp.S b/lib/builtins/arm/floatsidfvfp.S
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+//===-- floatsidfvfp.S - Implement floatsidfvfp ---------------------------===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+
+#include "../assembly.h"
+
+//
+// extern double __floatsidfvfp(int a);
+//
+// Converts a 32-bit int to a double precision float.
+// Uses Darwin calling convention where a double precision result is
+// return in GPR register pair.
+//
+ .syntax unified
+ .p2align 2
+DEFINE_COMPILERRT_FUNCTION(__floatsidfvfp)
+ vmov s15, r0 // move int to float register s15
+ vcvt.f64.s32 d7, s15 // convert 32-bit int in s15 to double in d7
+ vmov r0, r1, d7 // move d7 to result register pair r0/r1
+ bx lr
+END_COMPILERRT_FUNCTION(__floatsidfvfp)