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Mandelbrot: slight speedup on coldfire targets. Only noticeable at high iteration depths with full precision.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13631 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-06-14 22:50:21 +00:00
parent cee61b57c8
commit bb12e55989
1 changed files with 11 additions and 11 deletions
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22
apps/plugins/mandelbrot.c
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@ -298,19 +298,19 @@ static inline long muls32_asr26(long a, long b)
{
long r, t1;
asm (
"mac.l %[a],%[b],%%acc0\n" /* multiply */
"mulu.l %[a],%[b] \n" /* get lower half */
"movclr.l %%acc0,%[r] \n" /* get higher half */
"asl.l #5,%[r] \n" /* hi <<= 5, plus one free */
"moveq.l #26,%[t1] \n"
"lsr.l %[t1],%[b] \n" /* (unsigned)lo >>= 26 */
"or.l %[b],%[r] \n" /* combine result */
"mac.l %[a], %[b], %%acc0 \n" /* multiply */
"move.l %%accext01, %[t1] \n" /* get low part */
"movclr.l %%acc0, %[r] \n" /* get high part */
"asl.l #5, %[r] \n" /* hi <<= 5, plus one free */
"lsr.l #3, %[t1] \n" /* lo >>= 3 */
"and.l #0x1f, %[t1] \n" /* mask out unrelated bits */
"or.l %[t1], %[r] \n" /* combine result */
: /* outputs */
[r]"=&d"(r),
[t1]"=&d"(t1),
[b] "+d" (b)
[r] "=d"(r),
[t1]"=d"(t1)
: /* inputs */
[a] "d" (a)
[a] "d" (a),
[b] "d" (b)
);
return r;
}