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Optimizations for doom: coldfire asm drawspan routine = not much, fixed point multiply changes = not much, H300 asm lcd update = some, IRAM sound updates and simplifications = more

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9747 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Karl Kurbjun 2006-04-20 19:39:56 +00:00
parent 9e9921b087
commit 29ab31e8f1
4 changed files with 106 additions and 49 deletions
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51
apps/plugins/doom/r_draw.c
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@ -526,16 +526,48 @@ byte *ds_source IBSS_ATTR;
void R_DrawSpan (void)
{
register unsigned count,xfrac = ds_xfrac,yfrac = ds_yfrac;
#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
// only slightly faster
asm volatile (
"tst %[count] \n"
"beq endspanloop \n"
"clr.l %%d4 \n"
"spanloop: \n"
"move.l %[xfrac], %%d1 \n"
"move.l %[yfrac], %%d2 \n"
"lsr.l #8,%%d1 \n"
"lsr.l #8,%%d2 \n"
"lsr.l #8,%%d1 \n"
"lsr.l #2,%%d2 \n"
"and.l #63,%%d1 \n"
"and.l #4032,%%d2 \n"
"or.l %%d2, %%d1 \n"
"move.b (%[source], %%d1), %%d4 \n"
"add.l %[ds_xstep], %[xfrac] \n"
"add.l %[ds_ystep], %[yfrac] \n"
"move.b (%[colormap],%%d4.l), (%[dest])+ \n"
"subq.l #1, %[count] \n"
"bne spanloop \n"
"endspanloop: \n"
: /* outputs */
: /* inputs */
[count] "d" (ds_x2-ds_x1+1),
[xfrac] "d" (ds_xfrac),
[yfrac] "d" (ds_yfrac),
[source] "a" (ds_source),
[colormap] "a" (ds_colormap),
[dest] "a" (topleft+ds_y*SCREENWIDTH +ds_x1),
[ds_xstep] "d" (ds_xstep),
[ds_ystep] "d" (ds_ystep)
: /* clobbers */
"d1", "d2", "d4"
);
#else
register unsigned count = ds_x2 - ds_x1 + 1,xfrac = ds_xfrac,yfrac = ds_yfrac;
byte *source;
byte *colormap;
byte *dest;
source = ds_source;
colormap = ds_colormap;
dest = topleft + ds_y*SCREENWIDTH + ds_x1;
count = ds_x2 - ds_x1 + 1;
register byte *source = ds_source;
register byte *colormap = ds_colormap;
register byte *dest = topleft + ds_y*SCREENWIDTH + ds_x1;
while (count)
{
@ -550,6 +582,7 @@ void R_DrawSpan (void)
*dest++ = colormap[source[spot]];
count--;
}
#endif
}
//