diff options
| author | Siarhei Siamashka <siarhei.siamashka@nokia.com> | 2009-01-15 19:45:36 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2009-01-16 08:23:19 +0100 |
| commit | 82d00972c91a44a428bd08412ca3039e101c0e40 (patch) | |
| tree | 8cc953b4ec1148d73e14fb93d71951457792abbd /sbc/sbc_tables.h | |
| parent | 9e31e7dde636ca28ee551e8bcf8e4f4ca0ef553d (diff) | |
SBC arrays and constant tables aligned at 16 byte boundary for SIMD
Most SIMD instruction sets benefit from data being naturally aligned.
And even if it is not strictly required, performance is usually better
with the aligned data. ARM NEON and SSE2 have different instruction
variants for aligned/unaligned memory accesses.
Diffstat (limited to 'sbc/sbc_tables.h')
| -rw-r--r-- | sbc/sbc_tables.h | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/sbc/sbc_tables.h b/sbc/sbc_tables.h index a9a995fa..7c2af076 100644 --- a/sbc/sbc_tables.h +++ b/sbc/sbc_tables.h @@ -351,6 +351,20 @@ static const FIXED_T cos_table_fixed_8[128] = { #undef F /* + * Enforce 16 byte alignment for the data, which is supposed to be used + * with SIMD optimized code. + */ + +#define SBC_ALIGN_BITS 4 +#define SBC_ALIGN_MASK ((1 << (SBC_ALIGN_BITS)) - 1) + +#ifdef __GNUC__ +#define SBC_ALIGNED __attribute__((aligned(1 << (SBC_ALIGN_BITS)))) +#else +#define SBC_ALIGNED +#endif + +/* * Constant tables for the use in SIMD optimized analysis filters * Each table consists of two parts: * 1. reordered "proto" table @@ -360,7 +374,7 @@ static const FIXED_T cos_table_fixed_8[128] = { * and "odd" cases are needed */ -static const FIXED_T analysis_consts_fixed4_simd_even[40 + 16] = { +static const FIXED_T SBC_ALIGNED analysis_consts_fixed4_simd_even[40 + 16] = { #define F(x) F_PROTO4(x) F(0.00000000E+00), F(3.83720193E-03), F(5.36548976E-04), F(2.73370904E-03), @@ -395,7 +409,7 @@ static const FIXED_T analysis_consts_fixed4_simd_even[40 + 16] = { #undef F }; -static const FIXED_T analysis_consts_fixed4_simd_odd[40 + 16] = { +static const FIXED_T SBC_ALIGNED analysis_consts_fixed4_simd_odd[40 + 16] = { #define F(x) F_PROTO4(x) F(2.73370904E-03), F(5.36548976E-04), -F(1.49188357E-03), F(0.00000000E+00), @@ -430,7 +444,7 @@ static const FIXED_T analysis_consts_fixed4_simd_odd[40 + 16] = { #undef F }; -static const FIXED_T analysis_consts_fixed8_simd_even[80 + 64] = { +static const FIXED_T SBC_ALIGNED analysis_consts_fixed8_simd_even[80 + 64] = { #define F(x) F_PROTO8(x) F(0.00000000E+00), F(2.01182542E-03), F(1.56575398E-04), F(1.78371725E-03), @@ -509,7 +523,7 @@ static const FIXED_T analysis_consts_fixed8_simd_even[80 + 64] = { #undef F }; -static const FIXED_T analysis_consts_fixed8_simd_odd[80 + 64] = { +static const FIXED_T SBC_ALIGNED analysis_consts_fixed8_simd_odd[80 + 64] = { #define F(x) F_PROTO8(x) F(0.00000000E+00), -F(8.23919506E-04), F(1.56575398E-04), F(1.78371725E-03), |