diff options
| author | Nils Wallménius <nils@rockbox.org> | 2010-06-18 13:47:37 +0000 |
|---|---|---|
| committer | Nils Wallménius <nils@rockbox.org> | 2010-06-18 13:47:37 +0000 |
| commit | 273d05906de397785d97f71c221b8dde9e77e93e (patch) | |
| tree | 744fc563736500ca96b59f6391bce0e733399b89 /apps/codecs/libmad/imdct_mcf5249.S | |
| parent | 68e2023184ab0138a0c475e2100c1d76891ef2af (diff) | |
libmad: Optimize away 2 instructions from coldfire III_imdct, no measurable speed difference.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26918 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libmad/imdct_mcf5249.S')
| -rw-r--r-- | apps/codecs/libmad/imdct_mcf5249.S | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/apps/codecs/libmad/imdct_mcf5249.S b/apps/codecs/libmad/imdct_mcf5249.S index d6d4460986..b5e2a12b0f 100644 --- a/apps/codecs/libmad/imdct_mcf5249.S +++ b/apps/codecs/libmad/imdct_mcf5249.S @@ -34,10 +34,10 @@ III_imdct_s: * get more low bits out of the accext01 register _before_ doing the * movclrs. */ - sub.l %a0, %a0 /* clear loop variable */ + moveq.l #3, %d5 /* we do three outer loop iterations */ .imdctloop: /* outer loop label */ lea.l imdct_s, %a1 /* load pointer to imdct coefs in a1 */ - movem.l (%a2), %d0-%d5 /* load some input data in d0-d5 */ + movem.l (%a2), %d0-%d4/%a0 /* load some input data in d0-d4/a0 */ lea.l (6*4, %a2), %a2 clr.l %d7 /* clear loop variable */ @@ -48,7 +48,7 @@ III_imdct_s: mac.l %d2, %a4, (%a1)+, %a4, %acc0 mac.l %d3, %a4, (%a1)+, %a4, %acc0 mac.l %d4, %a4, (%a1)+, %a4, %acc0 - mac.l %d5, %a4, (%a1)+, %a4, %acc0 + mac.l %a0, %a4, (%a1)+, %a4, %acc0 movclr.l %acc0, %d6 /* get result, left shifted once */ asl.l #3, %d6 /* one shift free, shift three more */ move.l %d6, (%a3, %d7.l*4) /* yptr[i] = result */ @@ -60,7 +60,7 @@ III_imdct_s: mac.l %d2, %a4, (%a1)+, %a4, %acc0 mac.l %d3, %a4, (%a1)+, %a4, %acc0 mac.l %d4, %a4, (%a1)+, %a4, %acc0 - mac.l %d5, %a4, (%a1)+, %a4, %acc0 + mac.l %a0, %a4, (%a1)+, %a4, %acc0 movclr.l %acc0, %d6 /* get result */ asl.l #3, %d6 move.l %d6, (11*4, %a3, %d7.l*4) /* yptr[11 - i] = result */ @@ -72,9 +72,7 @@ III_imdct_s: jne .macloop lea.l (12*4, %a3), %a3 /* add pointer increment */ - addq.l #1, %a0 /* increment outer loop variable */ - moveq.l #3, %d0 - cmp.l %d0, %a0 /* we do three outer loop iterations */ + subq.l #1, %d5 /* decrement outer loop variable */ jne .imdctloop /* windowing, overlapping and concatenation */ |