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dec_neon.c: convert TransformDC to intrinsics

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no noticeable difference in performance

Change-Id: Ia2d287289c3865ddd0fc99edaf7a030778aa7025
This commit is contained in:
James Zern 2014-02-12 19:52:56 -08:00
parent 9cba963f9a
commit e02f16ef45
1 changed files with 28 additions and 24 deletions
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52
src/dsp/dec_neon.c
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@ -315,34 +315,38 @@ static void TransformTwo(const int16_t* in, uint8_t* dst, int do_two) {
}
static void TransformDC(const int16_t* in, uint8_t* dst) {
const int DC = (in[0] + 4) >> 3;
const int kBPS = BPS;
__asm__ volatile (
"vdup.16 q1, %[DC] \n"
const int16x8_t DC = vdupq_n_s16((in[0] + 4) >> 3);
uint32x2_t dst01 = {0, 0};
uint32x2_t dst23 = {0, 0};
"vld1.32 d0[0], [%[dst]], %[kBPS] \n"
"vld1.32 d1[0], [%[dst]], %[kBPS] \n"
"vld1.32 d0[1], [%[dst]], %[kBPS] \n"
"vld1.32 d1[1], [%[dst]], %[kBPS] \n"
// Load the source pixels.
dst01 = vset_lane_u32(*(uint32_t*)(dst + 0 * BPS), dst01, 0);
dst23 = vset_lane_u32(*(uint32_t*)(dst + 2 * BPS), dst23, 0);
dst01 = vset_lane_u32(*(uint32_t*)(dst + 1 * BPS), dst01, 1);
dst23 = vset_lane_u32(*(uint32_t*)(dst + 3 * BPS), dst23, 1);
"sub %[dst], %[dst], %[kBPS], lsl #2 \n"
{
// Convert to 16b.
int16x8_t dst01_s16 =
vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst01)));
int16x8_t dst23_s16 =
vreinterpretq_s16_u16(vmovl_u8(vreinterpret_u8_u32(dst23)));
// add DC and convert to s16.
"vaddw.u8 q2, q1, d0 \n"
"vaddw.u8 q3, q1, d1 \n"
// convert back to u8 with saturation
"vqmovun.s16 d0, q2 \n"
"vqmovun.s16 d1, q3 \n"
// Add the inverse transform.
dst01_s16 = vaddq_s16(dst01_s16, DC);
dst23_s16 = vaddq_s16(dst23_s16, DC);
{
// Unsigned saturate to 8b.
const uint8x8_t dst01_u8 = vqmovun_s16(dst01_s16);
const uint8x8_t dst23_u8 = vqmovun_s16(dst23_s16);
"vst1.32 d0[0], [%[dst]], %[kBPS] \n"
"vst1.32 d1[0], [%[dst]], %[kBPS] \n"
"vst1.32 d0[1], [%[dst]], %[kBPS] \n"
"vst1.32 d1[1], [%[dst]] \n"
: [in] "+r"(in), [dst] "+r"(dst) /* modified registers */
: [kBPS] "r"(kBPS), /* constants */
[DC] "r"(DC)
: "memory", "q0", "q1", "q2", "q3" /* clobbered */
);
// Store the results.
*(int*)(dst + 0 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst01_u8), 0);
*(int*)(dst + 1 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst01_u8), 1);
*(int*)(dst + 2 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst23_u8), 0);
*(int*)(dst + 3 * BPS) = vget_lane_s32(vreinterpret_s32_u8(dst23_u8), 1);
}
}
}
static void TransformWHT(const int16_t* in, int16_t* out) {