armv7(float): Optimize encode usecase using NE10 library

Optimize opus encode (float only) usecase using ARM NE10
library. Mainly effects opus_fft and ctl_mdct_forward
and related functions.

This optimization can be used for ARM CPUs that have NEON
VFP unit. This patch only enables optimizations for ARMv7.

Official ARM NE10 library page available at
http://projectne10.github.io/Ne10/

To enable this optimization, use
--enable-intrinsics --with-NE10=<install_prefix>
or
--enable-intrinsics --with-NE10-libraries=<NE10_lib_dir> --with-NE10-includes=<NE10_includes_dir>

Compile time checks made during configure process to make sure
optimization option available only when compiler supports NEON
instrinsics.

Runtime checks made to make sure optimized functions only called
on appropriate hardware.

Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/celt/mdct.c b/celt/mdct.c
index 2795d90d..ee6d80ec 100644
--- a/celt/mdct.c
+++ b/celt/mdct.c
@@ -60,7 +60,7 @@
 
 #ifdef CUSTOM_MODES
 
-int clt_mdct_init(mdct_lookup *l,int N, int maxshift)
+int clt_mdct_init(mdct_lookup *l,int N, int maxshift, int arch)
 {
    int i;
    kiss_twiddle_scalar *trig;
@@ -71,9 +71,9 @@ int clt_mdct_init(mdct_lookup *l,int N, int maxshift)
    for (i=0;i<=maxshift;i++)
    {
       if (i==0)
-         l->kfft[i] = opus_fft_alloc(N>>2>>i, 0, 0);
+         l->kfft[i] = opus_fft_alloc(N>>2>>i, 0, 0, arch);
       else
-         l->kfft[i] = opus_fft_alloc_twiddles(N>>2>>i, 0, 0, l->kfft[0]);
+         l->kfft[i] = opus_fft_alloc_twiddles(N>>2>>i, 0, 0, l->kfft[0], arch);
 #ifndef ENABLE_TI_DSPLIB55
       if (l->kfft[i]==NULL)
          return 0;
@@ -104,11 +104,11 @@ int clt_mdct_init(mdct_lookup *l,int N, int maxshift)
    return 1;
 }
 
-void clt_mdct_clear(mdct_lookup *l)
+void clt_mdct_clear(mdct_lookup *l, int arch)
 {
    int i;
    for (i=0;i<=l->maxshift;i++)
-      opus_fft_free(l->kfft[i]);
+      opus_fft_free(l->kfft[i], arch);
    opus_free((kiss_twiddle_scalar*)l->trig);
 }
 
@@ -116,8 +116,8 @@ void clt_mdct_clear(mdct_lookup *l)
 
 /* Forward MDCT trashes the input array */
 #ifndef OVERRIDE_clt_mdct_forward
-void clt_mdct_forward(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scalar * OPUS_RESTRICT out,
-      const opus_val16 *window, int overlap, int shift, int stride)
+void clt_mdct_forward_c(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scalar * OPUS_RESTRICT out,
+      const opus_val16 *window, int overlap, int shift, int stride, int arch)
 {
    int i;
    int N, N2, N4;
@@ -132,6 +132,7 @@ void clt_mdct_forward(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scalar
    int scale_shift = st->scale_shift-1;
 #endif
    SAVE_STACK;
+   (void)arch;
    scale = st->scale;
 
    N = l->n;