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-rw-r--r--sysdeps/libm-i387/s_asinh.S6
1 files changed, 5 insertions, 1 deletions
diff --git a/sysdeps/libm-i387/s_asinh.S b/sysdeps/libm-i387/s_asinh.S
index a71d0b66f4..45153fe2d3 100644
--- a/sysdeps/libm-i387/s_asinh.S
+++ b/sysdeps/libm-i387/s_asinh.S
@@ -1,5 +1,5 @@
 /* ix87 specific implementation of arcsinh.
-   Copyright (C) 1996 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -51,8 +51,12 @@ ENTRY(__asinh)
 	andl	$0x80000000, %ecx
 	xorl	%ecx, 8(%esp)
 	fldl	4(%esp)			// |x|
+	movl	%eax, %edx
 	cmpl	$0x3e300000, %eax
 	jb	2f			// |x| < 2^-28
+	orl	$0x800fffff, %edx
+	incl	%edx
+	jz	4f			// x in ħInf or NaN
 	fldln2				// log(2) : |x|
 	cmpl	$0x41b00000, %eax
 	fxch				// |x| : log(2)