--- /dev/null
+/*
+ * $XConsortium: stipmips.s,v 1.10 94/04/17 20:29:08 keith Exp $
+ *
+Copyright (c) 1990 X Consortium
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+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
+X CONSORTIUM 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 X Consortium 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 X Consortium.
+ *
+ * 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
projects / rdpsrv / blobdiff