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reorder butterflies to reduce memory load/store

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Originally committed as revision 6037 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 19 years ago
parent 6c496518e8
commit 120aad7fe9
1 changed files with 65 additions and 56 deletions
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  1. 121
      libavcodec/mpegaudiodec.c

121
libavcodec/mpegaudiodec.c
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@ -582,87 +582,96 @@ static void dct32(int32_t *out, int32_t *tab)
{
int tmp0, tmp1;
/* pass 1 */
BF(0, 31, COS0_0);
BF(1, 30, COS0_1);
BF(2, 29, COS0_2);
BF(3, 28, COS0_3);
BF(4, 27, COS0_4);
BF(5, 26, COS0_5);
BF(6, 25, COS0_6);
BF(15, 16, COS0_15);
/* pass 2 */
BF(0, 15, COS1_0);
BF(16, 31, -COS1_0);
/* pass 1 */
BF(7, 24, COS0_7);
BF(8, 23, COS0_8);
BF(9, 22, COS0_9);
BF(10, 21, COS0_10);
BF(11, 20, COS0_11);
/* pass 2 */
BF(7, 8, COS1_7);
BF(23, 24, -COS1_7);
/* pass 3 */
BF(0, 7, COS2_0);
BF(8, 15, -COS2_0);
BF(16, 23, COS2_0);
BF(24, 31, -COS2_0);
/* pass 1 */
BF(3, 28, COS0_3);
BF(12, 19, COS0_12);
BF(13, 18, COS0_13);
BF(14, 17, COS0_14);
BF(15, 16, COS0_15);
/* pass 2 */
BF(0, 15, COS1_0);
BF(1, 14, COS1_1);
BF(2, 13, COS1_2);
BF(3, 12, COS1_3);
BF(19, 28, -COS1_3);
/* pass 1 */
BF(4, 27, COS0_4);
BF(11, 20, COS0_11);
/* pass 2 */
BF(4, 11, COS1_4);
BF(5, 10, COS1_5);
BF(6, 9, COS1_6);
BF(7, 8, COS1_7);
BF(20, 27, -COS1_4);
/* pass 3 */
BF(3, 4, COS2_3);
BF(11, 12, -COS2_3);
BF(19, 20, COS2_3);
BF(27, 28, -COS2_3);
/* pass 4 */
BF(0, 3, COS3_0);
BF(4, 7, -COS3_0);
BF(8, 11, COS3_0);
BF(12, 15, -COS3_0);
BF(16, 19, COS3_0);
BF(20, 23, -COS3_0);
BF(24, 27, COS3_0);
BF(28, 31, -COS3_0);
BF(16, 31, -COS1_0);
/* pass 1 */
BF(1, 30, COS0_1);
BF(14, 17, COS0_14);
/* pass 2 */
BF(1, 14, COS1_1);
BF(17, 30, -COS1_1);
BF(18, 29, -COS1_2);
BF(19, 28, -COS1_3);
BF(20, 27, -COS1_4);
BF(21, 26, -COS1_5);
/* pass 1 */
BF(6, 25, COS0_6);
BF(9, 22, COS0_9);
/* pass 2 */
BF(6, 9, COS1_6);
BF(22, 25, -COS1_6);
BF(23, 24, -COS1_7);
/* pass 3 */
BF(0, 7, COS2_0);
BF(1, 6, COS2_1);
BF(2, 5, COS2_2);
BF(3, 4, COS2_3);
BF(8, 15, -COS2_0);
BF(9, 14, -COS2_1);
BF(10, 13, -COS2_2);
BF(11, 12, -COS2_3);
BF(16, 23, COS2_0);
BF(17, 22, COS2_1);
BF(18, 21, COS2_2);
BF(19, 20, COS2_3);
BF(24, 31, -COS2_0);
BF(25, 30, -COS2_1);
BF(26, 29, -COS2_2);
BF(27, 28, -COS2_3);
/* pass 1 */
BF(2, 29, COS0_2);
BF(13, 18, COS0_13);
/* pass 2 */
BF(2, 13, COS1_2);
BF(18, 29, -COS1_2);
/* pass 1 */
BF(5, 26, COS0_5);
BF(10, 21, COS0_10);
/* pass 2 */
BF(5, 10, COS1_5);
BF(21, 26, -COS1_5);
/* pass 3 */
BF(2, 5, COS2_2);
BF(10, 13, -COS2_2);
BF(18, 21, COS2_2);
BF(26, 29, -COS2_2);
/* pass 4 */
BF(0, 3, COS3_0);
BF(1, 2, COS3_1);
BF(4, 7, -COS3_0);
BF(5, 6, -COS3_1);
BF(8, 11, COS3_0);
BF(9, 10, COS3_1);
BF(12, 15, -COS3_0);
BF(13, 14, -COS3_1);
BF(16, 19, COS3_0);
BF(17, 18, COS3_1);
BF(20, 23, -COS3_0);
BF(21, 22, -COS3_1);
BF(24, 27, COS3_0);
BF(25, 26, COS3_1);
BF(28, 31, -COS3_0);
BF(29, 30, -COS3_1);
/* pass 5 */

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