dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2024-11-20 12:28:26 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

dec_neon: TransformAC3: work on packed vectors

Browse Source 
pack 2 rows in 1 vector similar to TransformDC

Change-Id: I3b240ffb4f51a632b5c8c2daf54d938333ed4b0d
This commit is contained in:
James Zern 2014-02-19 03:17:29 +01:00
parent b7b60ca16c
commit 2719bb7e98
1 changed files with 24 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
src/dsp/dec_neon.c
View File

@ -428,45 +428,36 @@ static void TransformWHT(const int16_t* in, int16_t* out) {
static void TransformAC3(const int16_t* in, uint8_t* dst) { static void TransformAC3(const int16_t* in, uint8_t* dst) {
static const int kC1 = 20091 + (1 << 16); static const int kC1 = 20091 + (1 << 16);
static const int kC2 = 35468; static const int kC2 = 35468;
const int16x8_t A = vdupq_n_s16(in[0] + 4); const int16x4_t A = vdup_n_s16(in[0] + 4);
const int16x8_t c4 = vdupq_n_s16(MUL(in[4], kC2)); const int16x4_t c4 = vdup_n_s16(MUL(in[4], kC2));
const int16x8_t d4 = vdupq_n_s16(MUL(in[4], kC1)); const int16x4_t d4 = vdup_n_s16(MUL(in[4], kC1));
const int c1 = MUL(in[1], kC2); const int c1 = MUL(in[1], kC2);
const int d1 = MUL(in[1], kC1); const int d1 = MUL(in[1], kC1);
const int16x8_t CD = {d1, c1, -c1, -d1, 0, 0, 0, 0}; const int16x4_t CD = {d1, c1, -c1, -d1};
const int16x8_t B = vqaddq_s16(A, CD); const int16x4_t B = vqadd_s16(A, CD);
const int16x8_t m0 = vqaddq_s16(B, d4); const int16x8_t m0_m1 = vcombine_s16(vqadd_s16(B, d4), vqadd_s16(B, c4));
const int16x8_t m1 = vqaddq_s16(B, c4); const int16x8_t m2_m3 = vcombine_s16(vqsub_s16(B, c4), vqsub_s16(B, d4));
const int16x8_t m2 = vqsubq_s16(B, c4); uint32x2_t dst01 = {0, 0};
const int16x8_t m3 = vqsubq_s16(B, d4); uint32x2_t dst23 = {0, 0};
// Load the source pixels and convert to 16b.
int16x8_t dst0 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 0 * BPS))));
int16x8_t dst1 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 1 * BPS))));
int16x8_t dst2 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 2 * BPS))));
int16x8_t dst3 = vreinterpretq_s16_u16(
vmovl_u8(vcreate_u8(*(uint32_t*)(dst + 3 * BPS))));
// Add the inverse transform. // Load the source pixels.
dst0 = vsraq_n_s16(dst0, m0, 3); dst01 = vset_lane_u32(*(uint32_t*)(dst + 0 * BPS), dst01, 0);
dst1 = vsraq_n_s16(dst1, m1, 3); dst23 = vset_lane_u32(*(uint32_t*)(dst + 2 * BPS), dst23, 0);
dst2 = vsraq_n_s16(dst2, m2, 3); dst01 = vset_lane_u32(*(uint32_t*)(dst + 1 * BPS), dst01, 1);
dst3 = vsraq_n_s16(dst3, m3, 3); dst23 = vset_lane_u32(*(uint32_t*)(dst + 3 * BPS), dst23, 1);
{ {
// Unsigned saturate to 8b. // Convert to 16b.
const uint8x8_t dst0_ = vqmovun_s16(dst0); int16x8_t dst01_s16 =
const uint8x8_t dst1_ = vqmovun_s16(dst1); vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst01)));
const uint8x8_t dst2_ = vqmovun_s16(dst2); int16x8_t dst23_s16 =
const uint8x8_t dst3_ = vqmovun_s16(dst3); vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst23)));
// Store the results. // Add the inverse transform.
*(int*)(dst + 0 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst0_), 0); dst01_s16 = vsraq_n_s16(dst01_s16, m0_m1, 3);
*(int*)(dst + 1 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst1_), 0); dst23_s16 = vsraq_n_s16(dst23_s16, m2_m3, 3);
*(int*)(dst + 2 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst2_), 0);
*(int*)(dst + 3 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst3_), 0); SaturateAndStore4x4(dst, dst01_s16, dst23_s16);
} }
} }
#undef MUL #undef MUL