Standard Libraries for EDK II.

[mirror_edk2.git] / StdLib / LibC / Main / Ia32 / isinfl.c

diff --git a/StdLib/LibC/Main/Ia32/isinfl.c b/StdLib/LibC/Main/Ia32/isinfl.c
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+++ b/StdLib/LibC/Main/Ia32/isinfl.c
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+/*  $NetBSD: isinfl.c,v 1.5.16.1 2007/05/07 19:49:07 pavel Exp $  */\r
+\r
+/*\r
+ * Copyright (c) 1992, 1993\r
+ *  The Regents of the University of California.  All rights reserved.\r
+ *\r
+ * This software was developed by the Computer Systems Engineering group\r
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and\r
+ * contributed to Berkeley.\r
+ *\r
+ * Redistribution and use in source and binary forms, with or without\r
+ * modification, are permitted provided that the following conditions\r
+ * are met:\r
+ * 1. Redistributions of source code must retain the above copyright\r
+ *    notice, this list of conditions and the following disclaimer.\r
+ * 2. Redistributions in binary form must reproduce the above copyright\r
+ *    notice, this list of conditions and the following disclaimer in the\r
+ *    documentation and/or other materials provided with the distribution.\r
+ * 3. Neither the name of the University nor the names of its contributors\r
+ *    may be used to endorse or promote products derived from this software\r
+ *    without specific prior written permission.\r
+ *\r
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
+ * SUCH DAMAGE.\r
+ *\r
+ * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp\r
+ */\r
+#include  <LibConfig.h>\r
+#include <sys/EfiCdefs.h>\r
+#if defined(LIBC_SCCS) && !defined(lint)\r
+#if 0\r
+static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93";\r
+#else\r
+__RCSID("$NetBSD: isinfl.c,v 1.5.16.1 2007/05/07 19:49:07 pavel Exp $");\r
+#endif\r
+#endif /* LIBC_SCCS and not lint */\r
+\r
+#include <machine/ieee.h>\r
+#include <math.h>\r
+\r
+#if defined(_MSC_VER)           /* Handle Microsoft VC++ compiler specifics. */\r
+  // C4700: uninitialized local variable used\r
+  #pragma warning ( disable : 4700 )\r
+#endif\r
+\r
+/*\r
+ * 7.12.3.3 isinf - test for infinity\r
+ *          IEEE 754 compatible 80-bit extended-precision Intel 386 version\r
+ */\r
+int\r
+__isinfl(long double x)\r
+{\r
+  union ieee_ext_u u;\r
+\r
+  u.extu_ld = x;\r
+\r
+  return (u.extu_ext.ext_exp == EXT_EXP_INFNAN &&\r
+       u.extu_ext.ext_frach == 0x80000000 && u.extu_ext.ext_fracl == 0);\r
+}\r