95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
/* $Xorg: fastblt.h,v 1.4 2001/02/09 02:05:17 xorgcvs Exp $ */
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/*
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Copyright 1989, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/* $XFree86: xc/programs/Xserver/mfb/fastblt.h,v 1.4 2001/01/17 22:37:01 dawes Exp $ */
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/*
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* Fast bitblt macros for certain hardware. If your machine has an addressing
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* mode of small constant + register, you'll probably want this magic specific
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* code. It's 25% faster for the R2000. I haven't studied the Sparc
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* instruction set, but I suspect it also has this addressing mode. Also,
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* unrolling the loop by 32 is possibly excessive for mfb. The number of times
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* the loop is actually looped through is pretty small.
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*/
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/*
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* WARNING: These macros make *a lot* of assumptions about
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* the environment they are invoked in. Plenty of implicit
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* arguments, lots of side effects. Don't use them casually.
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*/
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#define SwitchOdd(n) case n: BodyOdd(n)
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#define SwitchEven(n) case n: BodyEven(n)
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/* to allow mfb and cfb to share code... */
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#ifndef BitRight
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#define BitRight(a,b) SCRRIGHT(a,b)
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#define BitLeft(a,b) SCRLEFT(a,b)
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#endif
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#ifdef LARGE_INSTRUCTION_CACHE
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#define UNROLL 8
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#define PackedLoop \
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switch (nl & (UNROLL-1)) { \
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SwitchOdd( 7) SwitchEven( 6) SwitchOdd( 5) SwitchEven( 4) \
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SwitchOdd( 3) SwitchEven( 2) SwitchOdd( 1) \
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} \
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while ((nl -= UNROLL) >= 0) { \
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LoopReset \
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BodyEven( 8) \
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BodyOdd( 7) BodyEven( 6) BodyOdd( 5) BodyEven( 4) \
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BodyOdd( 3) BodyEven( 2) BodyOdd( 1) \
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}
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#else
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#define UNROLL 4
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#define PackedLoop \
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switch (nl & (UNROLL-1)) { \
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SwitchOdd( 3) SwitchEven( 2) SwitchOdd( 1) \
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} \
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while ((nl -= UNROLL) >= 0) { \
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LoopReset \
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BodyEven( 4) \
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BodyOdd( 3) BodyEven( 2) BodyOdd( 1) \
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}
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#endif
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#define DuffL(counter,label,body) \
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switch (counter & 3) { \
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label: \
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body \
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case 3: \
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body \
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case 2: \
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body \
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case 1: \
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body \
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case 0: \
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if ((counter -= 4) >= 0) \
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goto label; \
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}
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