From 24ae7c4c1f18c3086a779a2ee8f480ee5f4e7612 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Fri, 15 Jun 2001 15:22:07 +0000
Subject: Added fi_type union typedef to glheader.h. Replace various float/int
 casts with the fi_type union cast. Fixes -fstrict-aliasing problems.

---
 src/mesa/main/glheader.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'src/mesa/main/glheader.h')

diff --git a/src/mesa/main/glheader.h b/src/mesa/main/glheader.h
index 0324b42ffd..596bd2d01e 100644
--- a/src/mesa/main/glheader.h
+++ b/src/mesa/main/glheader.h
@@ -1,4 +1,4 @@
-/* $Id: glheader.h,v 1.20 2001/05/14 23:11:12 brianp Exp $ */
+/* $Id: glheader.h,v 1.21 2001/06/15 15:22:07 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -241,5 +241,15 @@ typedef struct tagPIXELFORMATDESCRIPTOR PIXELFORMATDESCRIPTOR, *PPIXELFORMATDESC
 #endif
 
 
+/*
+ * Sometimes we treat GLfloats as GLints.  On x86 systems, moving a float
+ * as a int (thereby using integer registers instead of fp registers) is
+ * a performance win.  Typically, this can be done with ordinary casts.
+ * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
+ * these casts generate warnings.
+ * The following union typedef is used to solve that.
+ */
+typedef union { GLfloat f; GLint i; } fi_type;
+
 
 #endif /* GLHEADER_H */
-- 
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