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Negate _after_ output so we don't negate the whole output signal.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15294 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2007-10-24 23:30:55 +00:00
parent 4c913fced3
commit f6b358dfa0
1 changed files with 3 additions and 2 deletions
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5
apps/codecs/libspeex/filters_cf.S
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@ -31,6 +31,7 @@
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
.text
/* void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack) */
.global iir_mem16
@ -70,8 +71,8 @@ iir_mem16:
move.l %a6, %d0 | Clip high
2:
sub.l %d1, %d0 | Bias clipped result back to [-32767..32767]
neg.l %d0 | msac.w is bugged in gas, do this for now
move.w %d0, (%a5)+ | Write result to y[i]
neg.l %d0 | msac.w is bugged in gas, do this for now
move.l (%a4)+, %a6 | Fetch den[0] and den[1]
mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1
@ -126,8 +127,8 @@ iir_mem16:
move.l %a6, %d0 | Clip high
2:
sub.l %d1, %d0 | Bias clipped result back to [-32767..32767]
neg.l %d0 | msac.w is bugged in gas, do this for now
move.w %d0, (%a5)+ | Write result to y[i]
neg.l %d0 | msac.w is bugged in gas, do this for now
move.l (%a4)+, %a6 | Fetch den[0] and den[1]
mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1