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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 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
.text .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) */ /* 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 .global iir_mem16
@ -70,8 +71,8 @@ iir_mem16:
move.l %a6, %d0 | Clip high move.l %a6, %d0 | Clip high
2: 2:
sub.l %d1, %d0 | Bias clipped result back to [-32767..32767] 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] 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] move.l (%a4)+, %a6 | Fetch den[0] and den[1]
mac.w %a6u, %d0l, %acc0 mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1 mac.w %a6l, %d0l, (%a4)+, %a6, %acc1
@ -126,8 +127,8 @@ iir_mem16:
move.l %a6, %d0 | Clip high move.l %a6, %d0 | Clip high
2: 2:
sub.l %d1, %d0 | Bias clipped result back to [-32767..32767] 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] 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] move.l (%a4)+, %a6 | Fetch den[0] and den[1]
mac.w %a6u, %d0l, %acc0 mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1 mac.w %a6l, %d0l, (%a4)+, %a6, %acc1