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Diffstat (limited to 'mfb/fastblt.h')
| -rw-r--r-- | mfb/fastblt.h | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/mfb/fastblt.h b/mfb/fastblt.h new file mode 100644 index 000000000..6567a8936 --- /dev/null +++ b/mfb/fastblt.h @@ -0,0 +1,118 @@ +/* $Xorg: fastblt.h,v 1.4 2001/02/09 02:05:17 xorgcvs Exp $ */ +/* + +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... */ +#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 + +#if PPW == 32 +#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; \ + } +#else /* PPW == 64 */ +#define DuffL(counter,label,body) \ + switch (counter & 7) { \ + label: \ + body \ + case 7: \ + body \ + case 6: \ + body \ + case 5: \ + body \ + case 4: \ + body \ + case 3: \ + body \ + case 2: \ + body \ + case 1: \ + body \ + case 0: \ + if ((counter -= 8) >= 0) \ + goto label; \ + } +#endif /* PPW */ |