291 lines
6.4 KiB
ArmAsm
291 lines
6.4 KiB
ArmAsm
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/*
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* $Xorg: stipsparc.s,v 1.4 2001/02/09 02:04:39 xorgcvs Exp $
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* $XdotOrg: $
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*
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Copyright 1990, 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 in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*
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* Author: Keith Packard, MIT X Consortium
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*/
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/* $XFree86: xc/programs/Xserver/cfb/stipsparc.s,v 1.4 2001/01/17 22:36:38 dawes Exp $ */
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/*
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* SPARC assembly code for optimized text rendering.
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*
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* Other stippling could be done in assembly, but the payoff is
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* not nearly as large. Mostly because large areas are heavily
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* optimized already.
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*/
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/* not that I expect to ever see an LSB SPARC, but ... */
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#ifdef LITTLE_ENDIAN
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# define BitsR sll
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# define BitsL srl
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# define BO(o) o
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# define HO(o) o
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# define WO(o) o
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# define FourBits(dest,bits) and bits, 0xf, dest
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#else
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# define BitsR srl
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# define BitsL sll
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# define BO(o) 3-o
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# define HO(o) 2-o
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# define WO(o) o
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# define FourBits(dest,bits) srl bits, 28, dest
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#endif
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/*
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* cfbStippleStack(addr, stipple, value, stride, Count, Shift)
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* 4 5 6 7 16(sp) 20(sp)
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*
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* Apply successive 32-bit stipples starting at addr, addr+stride, ...
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*
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* Used for text rendering, but only when no data could be lost
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* when the stipple is shifted left by Shift bits
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*/
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/* arguments */
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#define addr %i0
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#define stipple %i1
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#define value %i2
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#define stride %i3
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#define count %i4
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#define shift %i5
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/* local variables */
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#define atemp %l0
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#define bits %l1
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#define lshift %l2
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#define sbase %l3
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#define stemp %l4
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#define CASE_SIZE 5 /* case blocks are 2^5 bytes each */
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#define CASE_MASK 0x1e0 /* first case mask */
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#define ForEachLine LY1
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#define NextLine LY2
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#define CaseBegin LY3
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#define ForEachBits LY4
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#define NextBits LY5
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#if defined(SVR4) || defined(__ELF__)
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#ifdef TETEXT
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#define _cfbStippleStack cfbStippleStackTE
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#else
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#define _cfbStippleStack cfbStippleStack
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#endif
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#else
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#ifdef TETEXT
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#define _cfbStippleStack _cfbStippleStackTE
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#endif
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#endif
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.seg "text"
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.proc 16
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.globl _cfbStippleStack
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_cfbStippleStack:
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save %sp,-64,%sp
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#ifdef SHAREDCODE
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1:
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call 2f
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nop
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2:
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mov %o7,sbase /* sbase = 1b(1:) */
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add sbase, CaseBegin-1b, sbase
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#else /* !SHAREDCODE */
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sethi %hi(CaseBegin),sbase /* load up switch table */
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or sbase,%lo(CaseBegin),sbase
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#endif /* SHAREDCODE */
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mov 4,lshift /* compute offset within */
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sub lshift, shift, lshift /* stipple of remaining bits */
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#ifdef LITTLE_ENDIAN
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inc CASE_SIZE, shift /* first shift for LSB */
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#else
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inc 28-CASE_SIZE, shift /* first shift for MSB */
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#endif
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/* do ... while (--count > 0); */
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ForEachLine:
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ld [stipple],bits /* get stipple bits */
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mov addr,atemp /* set up for this line */
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#ifdef TETEXT
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/* Terminal emulator fonts are expanded and have many 0 rows */
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tst bits
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bz NextLine /* skip out early on 0 */
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#endif
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add addr, stride, addr /* step for the loop */
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BitsR bits, shift, stemp /* get first bits */
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and stemp, CASE_MASK, stemp /* compute first jump */
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BitsL bits, lshift, bits /* set remaining bits */
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jmp sbase+stemp /* ... */
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tst bits
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ForEachBits:
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inc 4, atemp
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ForEachBits1:
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FourBits(stemp, bits) /* compute jump for */
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sll stemp, CASE_SIZE, stemp /* these four bits */
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BitsL bits, 4, bits /* step for remaining bits */
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jmp sbase+stemp /* jump */
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tst bits
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CaseBegin:
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bnz,a ForEachBits1 /* 0 */
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inc 4, atemp
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NextLine:
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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nop
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bnz ForEachBits /* 1 */
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stb value, [atemp+BO(0)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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nop
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bnz ForEachBits /* 2 */
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stb value, [atemp+BO(1)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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nop
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bnz ForEachBits /* 3 */
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sth value, [atemp+HO(0)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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nop
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bnz ForEachBits /* 4 */
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stb value, [atemp+BO(2)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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nop
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stb value, [atemp+BO(0)] /* 5 */
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bnz ForEachBits
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stb value, [atemp+BO(2)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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stb value, [atemp+BO(1)] /* 6 */
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bnz ForEachBits
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stb value, [atemp+BO(2)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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sth value, [atemp+HO(0)] /* 7 */
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bnz ForEachBits
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stb value, [atemp+BO(2)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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bnz ForEachBits /* 8 */
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stb value, [atemp+BO(3)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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nop
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stb value, [atemp+BO(0)] /* 9 */
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bnz ForEachBits
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stb value, [atemp+BO(3)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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stb value, [atemp+BO(1)] /* a */
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bnz ForEachBits
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stb value, [atemp+BO(3)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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sth value, [atemp+HO(0)] /* b */
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bnz ForEachBits
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stb value, [atemp+BO(3)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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bnz ForEachBits /* c */
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sth value, [atemp+HO(2)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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nop
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stb value, [atemp+BO(0)] /* d */
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bnz ForEachBits
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sth value, [atemp+HO(2)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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stb value, [atemp+BO(1)] /* e */
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bnz ForEachBits
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sth value, [atemp+HO(2)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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bnz ForEachBits /* f */
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st value, [atemp+WO(0)]
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deccc 1, count
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bnz,a ForEachLine
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inc 4, stipple
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ret
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restore
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