/*
* $Xorg: stipsparc.s,v 1.4 2001/02/09 02:04:39 xorgcvs Exp $
* $XdotOrg: $
*
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
*/
/* $XFree86: xc/programs/Xserver/cfb/stipsparc.s,v 1.4 2001/01/17 22:36:38 dawes Exp $ */
/*
* SPARC 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.
*/
/* not that I expect to ever see an LSB SPARC, but ... */
#ifdef LITTLE_ENDIAN
# define BitsR sll
# define BitsL srl
# define BO(o) o
# define HO(o) o
# define WO(o) o
# define FourBits(dest,bits) and bits, 0xf, dest
#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 bits, 28, dest
#endif
/*
* 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 %i0
#define stipple %i1
#define value %i2
#define stride %i3
#define count %i4
#define shift %i5
/* local variables */
#define atemp %l0
#define bits %l1
#define lshift %l2
#define sbase %l3
#define stemp %l4
#define CASE_SIZE 5 /* case blocks are 2^5 bytes each */
#define CASE_MASK 0x1e0 /* first case mask */
#define ForEachLine LY1
#define NextLine LY2
#define CaseBegin LY3
#define ForEachBits LY4
#define NextBits LY5
#if defined(SVR4) || defined(__ELF__)
#ifdef TETEXT
#define _cfbStippleStack cfbStippleStackTE
#else
#define _cfbStippleStack cfbStippleStack
#endif
#else
#ifdef TETEXT
#define _cfbStippleStack _cfbStippleStackTE
#endif
#endif
.seg "text"
.proc 16
.globl _cfbStippleStack
_cfbStippleStack:
save %sp,-64,%sp
#ifdef SHAREDCODE
1:
call 2f
nop
2:
mov %o7,sbase /* sbase = 1b(1:) */
add sbase, CaseBegin-1b, sbase
#else /* !SHAREDCODE */
sethi %hi(CaseBegin),sbase /* load up switch table */
or sbase,%lo(CaseBegin),sbase
#endif /* SHAREDCODE */
mov 4,lshift /* compute offset within */
sub lshift, shift, lshift /* stipple of remaining bits */
#ifdef LITTLE_ENDIAN
inc CASE_SIZE, shift /* first shift for LSB */
#else
inc 28-CASE_SIZE, shift /* first shift for MSB */
#endif
/* do ... while (--count > 0); */
ForEachLine:
ld [stipple],bits /* get stipple bits */
mov addr,atemp /* set up for this line */
#ifdef TETEXT
/* Terminal emulator fonts are expanded and have many 0 rows */
tst bits
bz NextLine /* skip out early on 0 */
#endif
add addr, stride, addr /* step for the loop */
BitsR bits, shift, stemp /* get first bits */
and stemp, CASE_MASK, stemp /* compute first jump */
BitsL bits, lshift, bits /* set remaining bits */
jmp sbase+stemp /* ... */
tst bits
ForEachBits:
inc 4, atemp
ForEachBits1:
FourBits(stemp, bits) /* compute jump for */
sll stemp, CASE_SIZE, stemp /* these four bits */
BitsL bits, 4, bits /* step for remaining bits */
jmp sbase+stemp /* jump */
tst bits
CaseBegin:
bnz,a ForEachBits1 /* 0 */
inc 4, atemp
NextLine:
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
nop
bnz ForEachBits /* 1 */
stb value, [atemp+BO(0)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
nop
bnz ForEachBits /* 2 */
stb value, [atemp+BO(1)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
nop
bnz ForEachBits /* 3 */
sth value, [atemp+HO(0)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
nop
bnz ForEachBits /* 4 */
stb value, [atemp+BO(2)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
nop
stb value, [atemp+BO(0)] /* 5 */
bnz ForEachBits
stb value, [atemp+BO(2)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
stb value, [atemp+BO(1)] /* 6 */
bnz ForEachBits
stb value, [atemp+BO(2)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
sth value, [atemp+HO(0)] /* 7 */
bnz ForEachBits
stb value, [atemp+BO(2)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
bnz ForEachBits /* 8 */
stb value, [atemp+BO(3)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
nop
stb value, [atemp+BO(0)] /* 9 */
bnz ForEachBits
stb value, [atemp+BO(3)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
stb value, [atemp+BO(1)] /* a */
bnz ForEachBits
stb value, [atemp+BO(3)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
sth value, [atemp+HO(0)] /* b */
bnz ForEachBits
stb value, [atemp+BO(3)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
bnz ForEachBits /* c */
sth value, [atemp+HO(2)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
nop
stb value, [atemp+BO(0)] /* d */
bnz ForEachBits
sth value, [atemp+HO(2)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
stb value, [atemp+BO(1)] /* e */
bnz ForEachBits
sth value, [atemp+HO(2)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
bnz ForEachBits /* f */
st value, [atemp+WO(0)]
deccc 1, count
bnz,a ForEachLine
inc 4, stipple
ret
restore
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