diff options
| -rw-r--r-- | celt/kiss_fft.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/celt/kiss_fft.h b/celt/kiss_fft.h index bffa2bfa..267f72f9 100644 --- a/celt/kiss_fft.h +++ b/celt/kiss_fft.h @@ -52,6 +52,10 @@ extern "C" { # define kiss_fft_scalar opus_int32 # define kiss_twiddle_scalar opus_int16 +/* Some 32-bit CPUs would load/store a kiss_twiddle_cpx with a single memory + * access, and could benefit from additional alignment. + */ +# define KISS_TWIDDLE_CPX_ALIGNMENT (sizeof(opus_int32)) #else # ifndef kiss_fft_scalar @@ -62,6 +66,12 @@ extern "C" { # endif #endif +#if defined(__GNUC__) && defined(KISS_TWIDDLE_CPX_ALIGNMENT) +#define KISS_TWIDDLE_CPX_ALIGNED __attribute__((aligned(KISS_TWIDDLE_CPX_ALIGNMENT))) +#else +#define KISS_TWIDDLE_CPX_ALIGNED +#endif + typedef struct { kiss_fft_scalar r; kiss_fft_scalar i; @@ -70,7 +80,7 @@ typedef struct { typedef struct { kiss_twiddle_scalar r; kiss_twiddle_scalar i; -}kiss_twiddle_cpx; +} KISS_TWIDDLE_CPX_ALIGNED kiss_twiddle_cpx; #define MAXFACTORS 8 /* e.g. an fft of length 128 has 4 factors |