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Diffstat (limited to 'cfb/stipmips.s')
| -rw-r--r-- | cfb/stipmips.s | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/cfb/stipmips.s b/cfb/stipmips.s new file mode 100644 index 000000000..c42d9b5ae --- /dev/null +++ b/cfb/stipmips.s @@ -0,0 +1,281 @@ +/* + * $Xorg: stipmips.s,v 1.4 2001/02/09 02:04:39 xorgcvs Exp $ + * +Copyright 1990, 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. + * + * Author: Keith Packard, MIT X Consortium + */ + +/* + * MIPS assembly code for optimized text rendering. + * + * Other stippling could be done in assembly, but the payoff is + * not nearly as large. Mostly because large areas are heavily + * optimized already. + */ + +#ifdef MIPSEL +# define BitsR sll +# define BitsL srl +# define BO(o) o +# define HO(o) o +# define WO(o) o +# define FourBits(dest,bits) and dest, bits, 0xf +#else +# define BitsR srl +# define BitsL sll +# define BO(o) 3-o +# define HO(o) 2-o +# define WO(o) o +# define FourBits(dest,bits) srl dest, bits, 28 +#endif + +/* reordering instructions would be fatal here */ + .set noreorder + + +/* + * cfbStippleStack(addr, stipple, value, stride, Count, Shift) + * 4 5 6 7 16(sp) 20(sp) + * + * Apply successive 32-bit stipples starting at addr, addr+stride, ... + * + * Used for text rendering, but only when no data could be lost + * when the stipple is shifted left by Shift bits + */ +/* arguments */ +#define addr $4 +#define stipple $5 +#define value $6 +#define stride $7 +#define Count 16($sp) +#define Shift 20($sp) + +/* local variables */ +#define count $14 +#define shift $13 +#define atemp $12 +#define bits $11 +#define lshift $9 +#define sbase $8 +#define stemp $2 + +#define CASE_SIZE 5 /* case blocks are 2^5 bytes each */ +#define CASE_MASK 0x1e0 /* first case mask */ + +#define ForEachLine $200 +#define NextLine $201 +#define NextLine1 $202 +#define CaseBegin $203 +#define ForEachBits $204 +#define ForEachBits1 $205 +#define NextBits $206 + +#ifdef TETEXT +#define cfbStippleStack cfbStippleStackTE +#endif + + .globl cfbStippleStack + .ent cfbStippleStack 2 +cfbStippleStack: + .frame $sp, 0, $31 + lw count, Count /* fetch stack params */ + la sbase,CaseBegin /* load up switch table */ + lw shift, Shift + li lshift, 4 /* compute offset within */ + subu lshift, lshift, shift /* stipple of remaining bits */ +#ifdef MIPSEL + addu shift, shift, CASE_SIZE /* first shift for LSB */ +#else + addu shift, shift, 28-CASE_SIZE /* first shift for MSB */ +#endif + /* do ... while (--count > 0); */ +ForEachLine: + lw bits, 0(stipple) /* get stipple bits */ + move atemp, addr /* set up for this line */ +#ifdef TETEXT + /* Terminal emulator fonts are expanded and have many 0 rows */ + beqz bits, NextLine /* skip out early on 0 */ +#endif + addu addr, addr, stride /* step for the loop */ + BitsR stemp, bits, shift /* get first bits */ + and stemp, stemp, CASE_MASK /* compute first branch */ + addu stemp, stemp, sbase /* ... */ + j stemp /* ... */ + BitsL bits, bits, lshift /* set remaining bits */ + +ForEachBits: + addu atemp, atemp, 4 +ForEachBits1: + FourBits(stemp, bits) /* compute jump for */ + sll stemp, stemp, CASE_SIZE /* next four bits */ + addu stemp, stemp, sbase /* ... */ + j stemp /* ... */ + BitsL bits, bits, 4 /* step for remaining bits */ +CaseBegin: + bnez bits, ForEachBits1 /* 0 */ + addu atemp, atemp, 4 +NextLine: + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + bnez bits, ForEachBits /* 1 */ + sb value, BO(0)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + bnez bits, ForEachBits /* 2 */ + sb value, BO(1)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + bnez bits, ForEachBits /* 3 */ + sh value, HO(0)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + bnez bits, ForEachBits /* 4 */ + sb value, BO(2)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + sb value, BO(0)(atemp) /* 5 */ + bnez bits, ForEachBits + sb value, BO(2)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + + sb value, BO(1)(atemp) /* 6 */ + bnez bits, ForEachBits + sb value, BO(2)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + + bnez bits, ForEachBits /* 7 */ + swl value, BO(2)(atemp) /* untested on MSB */ + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + bnez bits, ForEachBits /* 8 */ + sb value, BO(3)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + sb value, BO(0)(atemp) /* 9 */ + bnez bits, ForEachBits + sb value, BO(3)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + + sb value, BO(1)(atemp) /* a */ + bnez bits, ForEachBits + sb value, BO(3)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + + sh value, HO(0)(atemp) /* b */ + bnez bits, ForEachBits + sb value, BO(3)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + + bnez bits, ForEachBits /* c */ + sh value, HO(2)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + sb value, BO(0)(atemp) /* d */ + bnez bits, ForEachBits + sh value, HO(2)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + + bnez bits, ForEachBits /* e */ + swr value, BO(1)(atemp) /* untested on MSB */ + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + bnez bits, ForEachBits /* f */ + sw value, WO(0)(atemp) + addu count, count, -1 + bnez count, ForEachLine + addu stipple, stipple, 4 + j $31 + nop + nop + + .end cfbStippleStack |