Importing xserver from X.Org 7.2RC2

1 files changed, 96 insertions, 0 deletions

diff --git a/xserver/mfb/fastblt.h b/xserver/mfb/fastblt.h
new file mode 100644
index 000000000..35ba5a2a1
--- /dev/null
+++ b/xserver/mfb/fastblt.h
@@ -0,0 +1,96 @@
+/*
+
+Copyright 1989, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+*/
+
+/*
+ * Fast bitblt macros for certain hardware.  If your machine has an addressing
+ * mode of small constant + register, you'll probably want this magic specific
+ * code.  It's 25% faster for the R2000.  I haven't studied the Sparc
+ * instruction set, but I suspect it also has this addressing mode.  Also,
+ * unrolling the loop by 32 is possibly excessive for mfb. The number of times
+ * the loop is actually looped through is pretty small.
+ */
+
+/*
+ * WARNING:  These macros make *a lot* of assumptions about
+ * the environment they are invoked in.  Plenty of implicit
+ * arguments, lots of side effects.  Don't use them casually.
+ */
+
+#define SwitchOdd(n) case n: BodyOdd(n)
+#define SwitchEven(n) case n: BodyEven(n)
+
+/* to allow mfb and cfb to share code... */
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#ifndef BitRight
+#define BitRight(a,b) SCRRIGHT(a,b)
+#define BitLeft(a,b) SCRLEFT(a,b)
+#endif
+
+#ifdef LARGE_INSTRUCTION_CACHE
+#define UNROLL 8
+#define PackedLoop \
+    switch (nl & (UNROLL-1)) { \
+    SwitchOdd( 7) SwitchEven( 6) SwitchOdd( 5) SwitchEven( 4) \
+    SwitchOdd( 3) SwitchEven( 2) SwitchOdd( 1) \
+    } \
+    while ((nl -= UNROLL) >= 0) { \
+	LoopReset \
+	BodyEven( 8) \
+    	BodyOdd( 7) BodyEven( 6) BodyOdd( 5) BodyEven( 4) \
+    	BodyOdd( 3) BodyEven( 2) BodyOdd( 1) \
+    }
+#else
+#define UNROLL 4
+#define PackedLoop \
+    switch (nl & (UNROLL-1)) { \
+    SwitchOdd( 3) SwitchEven( 2) SwitchOdd( 1) \
+    } \
+    while ((nl -= UNROLL) >= 0) { \
+	LoopReset \
+    	BodyEven( 4) \
+    	BodyOdd( 3) BodyEven( 2) BodyOdd( 1) \
+    }
+#endif
+
+#define DuffL(counter,label,body) \
+    switch (counter & 3) { \
+    label: \
+        body \
+    case 3: \
+	body \
+    case 2: \
+	body \
+    case 1: \
+	body \
+    case 0: \
+	if ((counter -= 4) >= 0) \
+	    goto label; \
+    }