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diff --git a/compiler-rt/lib/arm/negsf2vfp.S b/compiler-rt/lib/arm/negsf2vfp.S
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+//===-- negsf2vfp.S - Implement negsf2vfp ---------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+//
+// extern float __negsf2vfp(float a);
+//
+// Returns the negation of a single precision floating point numbers using the
+// Darwin calling convention where single arguments are passsed like 32-bit ints
+//
+ .globl ___negsf2vfp
+___negsf2vfp:
+ eor r0, r0, #-2147483648 // flip sign bit on float in r0
+ bx lr
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