Created an separate kiss_twiddle_cpx type to make it possible to use

different precision for twiddles and data.

libcelt/_kiss_fft_guts.h

@@ -31,7 +31,7 @@ struct kiss_fft_state{
     int nfft;
     int factors[2*MAXFACTORS];
     int *bitrev;
-    kiss_fft_cpx twiddles[1];
+    kiss_twiddle_cpx twiddles[1];
 };
 
 /*

libcelt/kiss_fft.c

@@ -38,7 +38,7 @@ static void kf_bfly2(
                     )
 {
    kiss_fft_cpx * Fout2;
-   kiss_fft_cpx * tw1;
+   kiss_twiddle_cpx * tw1;
    int i,j;
    kiss_fft_cpx * Fout_beg = Fout;
    for (i=0;i<N;i++)
@@ -60,9 +60,9 @@ static void kf_bfly2(
          Fout->r = PSHR32(ADD32(SHL32(EXTEND32(Fout->r), 14), tr), 15);
          Fout->i = PSHR32(ADD32(SHL32(EXTEND32(Fout->i), 14), ti), 15);
 #else
+         kiss_fft_cpx t;
          Fout->r = SHR(Fout->r, 1);Fout->i = SHR(Fout->i, 1);
          Fout2->r = SHR(Fout2->r, 1);Fout2->i = SHR(Fout2->i, 1);
-         kiss_fft_cpx t;
          C_MUL (t,  *Fout2 , *tw1);
          tw1 += fstride;
          C_SUB( *Fout2 ,  *Fout , t );
@@ -84,7 +84,7 @@ static void ki_bfly2(
                     )
 {
    kiss_fft_cpx * Fout2;
-   kiss_fft_cpx * tw1;
+   kiss_twiddle_cpx * tw1;
    kiss_fft_cpx t;
    int i,j;
    kiss_fft_cpx * Fout_beg = Fout;
@@ -114,7 +114,7 @@ static void kf_bfly4(
                      int mm
                     )
 {
-   kiss_fft_cpx *tw1,*tw2,*tw3;
+   kiss_twiddle_cpx *tw1,*tw2,*tw3;
    kiss_fft_cpx scratch[6];
    const size_t m2=2*m;
    const size_t m3=3*m;
@@ -163,7 +163,7 @@ static void ki_bfly4(
                      int mm
                     )
 {
-   kiss_fft_cpx *tw1,*tw2,*tw3;
+   kiss_twiddle_cpx *tw1,*tw2,*tw3;
    kiss_fft_cpx scratch[6];
    const size_t m2=2*m;
    const size_t m3=3*m;
@@ -209,9 +209,9 @@ static void kf_bfly3(
 {
    size_t k=m;
    const size_t m2 = 2*m;
-   kiss_fft_cpx *tw1,*tw2;
+   kiss_twiddle_cpx *tw1,*tw2;
    kiss_fft_cpx scratch[5];
-   kiss_fft_cpx epi3;
+   kiss_twiddle_cpx epi3;
    epi3 = st->twiddles[fstride*m];
 
    tw1=tw2=st->twiddles;
@@ -252,9 +252,9 @@ static void ki_bfly3(
 {
    size_t k=m;
    const size_t m2 = 2*m;
-   kiss_fft_cpx *tw1,*tw2;
+   kiss_twiddle_cpx *tw1,*tw2;
    kiss_fft_cpx scratch[5];
-   kiss_fft_cpx epi3;
+   kiss_twiddle_cpx epi3;
    epi3 = st->twiddles[fstride*m];
 
    tw1=tw2=st->twiddles;
@@ -296,9 +296,9 @@ static void kf_bfly5(
    kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
    int u;
    kiss_fft_cpx scratch[13];
-   kiss_fft_cpx * twiddles = st->twiddles;
-   kiss_fft_cpx *tw;
-   kiss_fft_cpx ya,yb;
+   kiss_twiddle_cpx * twiddles = st->twiddles;
+   kiss_twiddle_cpx *tw;
+   kiss_twiddle_cpx ya,yb;
    ya = twiddles[fstride*m];
    yb = twiddles[fstride*2*m];
 
@@ -357,9 +357,9 @@ static void ki_bfly5(
    kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
    int u;
    kiss_fft_cpx scratch[13];
-   kiss_fft_cpx * twiddles = st->twiddles;
-   kiss_fft_cpx *tw;
-   kiss_fft_cpx ya,yb;
+   kiss_twiddle_cpx * twiddles = st->twiddles;
+   kiss_twiddle_cpx *tw;
+   kiss_twiddle_cpx ya,yb;
    ya = twiddles[fstride*m];
    yb = twiddles[fstride*2*m];
 
@@ -417,7 +417,7 @@ static void kf_bfly_generic(
                            )
 {
    int u,k,q1,q;
-   kiss_fft_cpx * twiddles = st->twiddles;
+   kiss_twiddle_cpx * twiddles = st->twiddles;
    kiss_fft_cpx t;
    kiss_fft_cpx scratchbuf[17];
    int Norig = st->nfft;
@@ -458,7 +458,7 @@ static void ki_bfly_generic(
                            )
 {
    int u,k,q1,q;
-   kiss_fft_cpx * twiddles = st->twiddles;
+   kiss_twiddle_cpx * twiddles = st->twiddles;
    kiss_fft_cpx t;
    kiss_fft_cpx scratchbuf[17];
    int Norig = st->nfft;
@@ -618,7 +618,7 @@ kiss_fft_cfg kiss_fft_alloc(int nfft,void * mem,size_t * lenmem )
 {
     kiss_fft_cfg st=NULL;
     size_t memneeded = sizeof(struct kiss_fft_state)
-          + sizeof(kiss_fft_cpx)*(nfft-1) + sizeof(int)*nfft; /* twiddle factors*/
+          + sizeof(kiss_twiddle_cpx)*(nfft-1) + sizeof(int)*nfft; /* twiddle factors*/
 
     if ( lenmem==NULL ) {
         st = ( kiss_fft_cfg)KISS_FFT_MALLOC( memneeded );

libcelt/kiss_fft.h

@@ -35,13 +35,16 @@ extern "C" {
 #include "arch.h"	
 #ifdef DOUBLE_PRECISION
 #  define kiss_fft_scalar celt_int32_t
+#  define kiss_twiddle_scalar celt_int32_t
 #else
 #  define kiss_fft_scalar celt_int16_t
+#  define kiss_twiddle_scalar celt_int16_t
 #endif
 #else
 # ifndef kiss_fft_scalar
 /*  default is float */
 #   define kiss_fft_scalar float
+#   define kiss_twiddle_scalar float
 # endif
 #endif
 
@@ -50,6 +53,11 @@ typedef struct {
     kiss_fft_scalar i;
 }kiss_fft_cpx;
 
+typedef struct {
+   kiss_twiddle_scalar r;
+   kiss_twiddle_scalar i;
+}kiss_twiddle_cpx;
+
 typedef struct kiss_fft_state* kiss_fft_cfg;
 
 /** 

libcelt/kiss_fftr.c

@@ -27,7 +27,7 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 struct kiss_fftr_state{
     kiss_fft_cfg substate;
     kiss_fft_cpx * tmpbuf;
-    kiss_fft_cpx * super_twiddles;
+    kiss_twiddle_cpx * super_twiddles;
 #ifdef USE_SIMD    
     long pad;
 #endif    
@@ -46,7 +46,7 @@ kiss_fftr_cfg kiss_fftr_alloc(int nfft,void * mem,size_t * lenmem)
     nfft >>= 1;
 
     kiss_fft_alloc (nfft, NULL, &subsize);
-    memneeded = sizeof(struct kiss_fftr_state) + subsize + sizeof(kiss_fft_cpx) * ( nfft * 2);
+    memneeded = sizeof(struct kiss_fftr_state) + subsize + sizeof(kiss_fft_cpx) * ( nfft) + sizeof(kiss_twiddle_cpx)*nfft;
 
     if (lenmem == NULL) {
         st = (kiss_fftr_cfg) KISS_FFT_MALLOC (memneeded);
@@ -60,7 +60,7 @@ kiss_fftr_cfg kiss_fftr_alloc(int nfft,void * mem,size_t * lenmem)
 
     st->substate = (kiss_fft_cfg) (st + 1); /*just beyond kiss_fftr_state struct */
     st->tmpbuf = (kiss_fft_cpx *) (((char *) st->substate) + subsize);
-    st->super_twiddles = st->tmpbuf + nfft;
+    st->super_twiddles = (kiss_twiddle_cpx*)(st->tmpbuf + nfft);
     kiss_fft_alloc(nfft, st->substate, &subsize);
 
 #if defined (FIXED_POINT) && !defined(DOUBLE_PRECISION)