From eeabf89d19214bb075709009a76b3354c4332ccf Mon Sep 17 00:00:00 2001
From: John Emmas <johne53@tiscali.co.uk>
Date: Wed, 17 Jul 2013 14:55:20 +0100
Subject: Miscellaneous header files (needed for building libpbd with MSVC)

---
 msvc_extra_headers/ardourext/float_cast.h.input | 73 +++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 msvc_extra_headers/ardourext/float_cast.h.input

(limited to 'msvc_extra_headers/ardourext/float_cast.h.input')

diff --git a/msvc_extra_headers/ardourext/float_cast.h.input b/msvc_extra_headers/ardourext/float_cast.h.input
new file mode 100644
index 0000000000..a5a82e3668
--- /dev/null
+++ b/msvc_extra_headers/ardourext/float_cast.h.input
@@ -0,0 +1,73 @@
+/*
+** Copyright (C) 2001 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
+**
+** Permission to use, copy, modify, distribute, and sell this file for any
+** purpose is hereby granted without fee, provided that the above copyright
+** and this permission notice appear in all copies.  No representations are
+** made about the suitability of this software for any purpose.  It is
+** provided "as is" without express or implied warranty.
+*/
+
+/* Version 1.1 */
+
+
+/*============================================================================
+**	On Intel Pentium processors (especially PIII and probably P4), converting
+**	from float to int is very slow. To meet the C specs, the code produced by
+**	most C compilers targeting Pentium needs to change the FPU rounding mode
+**	before the float to int conversion is performed.
+**
+**	Changing the FPU rounding mode causes the FPU pipeline to be flushed. It
+**	is this flushing of the pipeline which is so slow.
+**
+**	Fortunately the ISO C99 specifications define the functions lrint, lrintf,
+**	llrint and llrintf which fix this problem as a side effect.
+**
+**	On Unix-like systems, the configure process should have detected the
+**	presence of these functions. If they weren't found we have to replace them
+**	here with a standard C cast.
+*/
+
+/*
+**	The C99 prototypes for lrint and lrintf are as follows:
+**
+**		long int lrintf (float x) ;
+**		long int lrint  (double x) ;
+*/
+#ifndef __FLOAT_CAST_H__  // Added by JE - 30-11-2009
+#define __FLOAT_CAST_H__
+#if (defined (WIN32) || defined (_WIN32))
+
+	#include	<math.h>
+
+	/*	Win32 doesn't seem to have these functions.
+	**	Therefore implement inline versions of these functions here.
+	*/
+
+	__inline long int
+	lrint (double flt)
+	{	int intgr;
+
+		_asm
+		{	fld flt
+			fistp intgr
+			} ;
+
+		return intgr ;
+	}
+
+	__inline long int
+	lrintf (float flt)
+	{	int intgr;
+
+		_asm
+		{	fld flt
+			fistp intgr
+			} ;
+
+		return intgr ;
+	}
+
+#endif
+
+#endif  // __FLOAT_CAST_H__
-- 
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