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diff --git a/REORG.TODO/sysdeps/x86_64/fpu/s_copysignf.S b/REORG.TODO/sysdeps/x86_64/fpu/s_copysignf.S
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+/* copy sign, double version.
+   Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Andreas Jaeger <aj@suse.de>, 2002.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <machine/asm.h>
+
+	.section .rodata
+
+	.align ALIGNARG(4)
+	.type mask,@object
+mask:
+	.byte 0xff, 0xff, 0xff, 0x7f
+	ASM_SIZE_DIRECTIVE(mask)
+
+#ifdef PIC
+#define MO(op) op##(%rip)
+#else
+#define MO(op) op
+#endif
+
+	.text
+ENTRY(__copysignf)
+	movss	MO(mask),%xmm3
+	andps	%xmm3,%xmm0
+	andnps	%xmm1,%xmm3
+	orps	%xmm3,%xmm0
+	retq
+END (__copysignf)
+
+weak_alias (__copysignf, copysignf)