From bb1c49dfa484db080938cff6f8f70167c9026a1c Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Tue, 24 Jul 2007 19:26:47 +0000
Subject: Consistently rename all C++ files .cpp/.hpp. Fix (some) inclusion
 guard names to not clash with other libs.

git-svn-id: http://svn.drobilla.net/lad/ingen@613 a436a847-0d15-0410-975c-d299462d15a1
---
 src/libs/engine/util.hpp | 74 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 src/libs/engine/util.hpp

(limited to 'src/libs/engine/util.hpp')

diff --git a/src/libs/engine/util.hpp b/src/libs/engine/util.hpp
new file mode 100644
index 00000000..ce943673
--- /dev/null
+++ b/src/libs/engine/util.hpp
@@ -0,0 +1,74 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Ingen 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 General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <iostream>
+#include <cstdlib>
+
+#include <fenv.h>
+#ifdef __SSE__
+#include <xmmintrin.h>
+#endif
+
+using std::cerr; using std::endl;
+
+namespace Ingen {
+
+/** Set flags to disable denormal processing.
+ */
+inline void
+set_denormal_flags()
+{
+#ifdef __SSE__
+	unsigned long a, b, c, d;
+
+	asm("cpuid": "=a" (a), "=b" (b), "=c" (c), "=d" (d) : "a" (1));
+	if (d & 1<<25) { /* It has SSE support */
+		_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
+
+		asm("cpuid": "=a" (a), "=b" (b), "=c" (c), "=d" (d) : "a" (0));
+		if (b == 0x756e6547) { /* It's an Intel */
+			int stepping, model, family, extfamily;
+
+			family = (a >> 8) & 0xf;
+			extfamily = (a >> 20) & 0xff;
+			model = (a >> 4) & 0xf;
+			stepping = a & 0xf;
+			if (family == 15 && extfamily == 0 && model == 0 && stepping < 7) {
+				return;
+			}
+		}
+		asm("cpuid": "=a" (a), "=b" (b), "=c" (c), "=d" (d) : "a" (1));
+		if (d & 1<<26) { /* bit 26, SSE2 support */
+			_mm_setcsr(_mm_getcsr() | 0x40);
+			//cerr << "Set SSE denormal fix flag." << endl;
+		}
+	} else {
+		cerr << "This code has been built with SSE support, but your processor does"
+			<< " not support the SSE instruction set." << endl << "Exiting." << endl;
+		exit(EXIT_FAILURE);
+	}
+#endif
+	// Set 387 control register via standard C99 interface
+	fesetround(FE_TOWARDZERO);
+}
+
+} // namespace Ingen
+
+#endif // UTIL_H
-- 
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