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Add NEON version of FTransformWHT

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Contributed by Wayne Chen (datoudatou at gmail dot com)

Change-Id: I007c21db4eeadbf82b89f0963256f965deda7d90
This commit is contained in:
Pascal Massimino 2012-11-06 09:45:28 -08:00 committed by Johann
parent 812933d6ba
commit 22a0fd9d01
1 changed files with 89 additions and 0 deletions
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89
src/dsp/enc_neon.c
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@ -341,6 +341,94 @@ static void FTransform(const uint8_t* src, const uint8_t* ref,
);
}
static void FTransformWHT(const int16_t* in, int16_t* out) {
const int kStep = 32;
__asm__ volatile (
// d0 = in[0 * 16] , d1 = in[1 * 16]
// d2 = in[2 * 16] , d3 = in[3 * 16]
"vld1.16 d0[0], [%[in]], %[kStep] \n"
"vld1.16 d1[0], [%[in]], %[kStep] \n"
"vld1.16 d2[0], [%[in]], %[kStep] \n"
"vld1.16 d3[0], [%[in]], %[kStep] \n"
"vld1.16 d0[1], [%[in]], %[kStep] \n"
"vld1.16 d1[1], [%[in]], %[kStep] \n"
"vld1.16 d2[1], [%[in]], %[kStep] \n"
"vld1.16 d3[1], [%[in]], %[kStep] \n"
"vld1.16 d0[2], [%[in]], %[kStep] \n"
"vld1.16 d1[2], [%[in]], %[kStep] \n"
"vld1.16 d2[2], [%[in]], %[kStep] \n"
"vld1.16 d3[2], [%[in]], %[kStep] \n"
"vld1.16 d0[3], [%[in]], %[kStep] \n"
"vld1.16 d1[3], [%[in]], %[kStep] \n"
"vld1.16 d2[3], [%[in]], %[kStep] \n"
"vld1.16 d3[3], [%[in]], %[kStep] \n"
"vaddl.s16 q2, d0, d2 \n"
"vshl.s32 q2, q2, #2 \n" // a0=(in[0*16]+in[2*16])<<2
"vaddl.s16 q3, d1, d3 \n"
"vshl.s32 q3, q3, #2 \n" // a1=(in[1*16]+in[3*16])<<2
"vsubl.s16 q4, d1, d3 \n"
"vshl.s32 q4, q4, #2 \n" // a2=(in[1*16]-in[3*16])<<2
"vsubl.s16 q5, d0, d2 \n"
"vshl.s32 q5, q5, #2 \n" // a3=(in[0*16]-in[2*16])<<2
"vceq.s32 q10, q2, #0 \n"
"vmvn.s32 q10, q10 \n" // (a0 != 0)
"vqadd.s32 q6, q2, q3 \n" // (a0 + a1)
"vqsub.s32 q6, q6, q10 \n" // (a0 + a1) + (a0 != 0)
"vqadd.s32 q7, q5, q4 \n" // a3 + a2
"vqsub.s32 q8, q5, q4 \n" // a3 - a2
"vqsub.s32 q9, q2, q3 \n" // a0 - a1
// Transpose
// q6 = tmp[0, 1, 2, 3] ; q7 = tmp[ 4, 5, 6, 7]
// q8 = tmp[8, 9, 10, 11] ; q9 = tmp[12, 13, 14, 15]
"vswp d13, d16 \n" // vtrn.64 q0, q2
"vswp d15, d18 \n" // vtrn.64 q1, q3
"vtrn.32 q6, q7 \n"
"vtrn.32 q8, q9 \n"
"vqadd.s32 q0, q6, q8 \n" // a0 = tmp[0] + tmp[8]
"vqadd.s32 q1, q7, q9 \n" // a1 = tmp[4] + tmp[12]
"vqsub.s32 q2, q7, q9 \n" // a2 = tmp[4] - tmp[12]
"vqsub.s32 q3, q6, q8 \n" // a3 = tmp[0] - tmp[8]
"vqadd.s32 q4, q0, q1 \n" // b0 = a0 + a1
"vqadd.s32 q5, q3, q2 \n" // b1 = a3 + a2
"vqsub.s32 q6, q3, q2 \n" // b2 = a3 - a2
"vqsub.s32 q7, q0, q1 \n" // b3 = a0 - a1
"vmov.32 q0, #3 \n" // q0 = 3
"vcgt.s32 q1, q4, #0 \n" // (b0>0)
"vqsub.s32 q2, q4, q1 \n" // (b0+(b0>0))
"vqadd.s32 q3, q2, q0 \n" // (b0+(b0>0)+3)
"vshrn.s32 d18, q3, #3 \n" // (b0+(b0>0)+3) >> 3
"vcgt.s32 q1, q5, #0 \n" // (b1>0)
"vqsub.s32 q2, q5, q1 \n" // (b1+(b1>0))
"vqadd.s32 q3, q2, q0 \n" // (b1+(b1>0)+3)
"vshrn.s32 d19, q3, #3 \n" // (b1+(b1>0)+3) >> 3
"vcgt.s32 q1, q6, #0 \n" // (b2>0)
"vqsub.s32 q2, q6, q1 \n" // (b2+(b2>0))
"vqadd.s32 q3, q2, q0 \n" // (b2+(b2>0)+3)
"vshrn.s32 d20, q3, #3 \n" // (b2+(b2>0)+3) >> 3
"vcgt.s32 q1, q7, #0 \n" // (b3>0)
"vqsub.s32 q2, q7, q1 \n" // (b3+(b3>0))
"vqadd.s32 q3, q2, q0 \n" // (b3+(b3>0)+3)
"vshrn.s32 d21, q3, #3 \n" // (b3+(b3>0)+3) >> 3
"vst1.16 {q9, q10}, [%[out]] \n"
: [in] "+r"(in)
: [kStep] "r"(kStep), [out] "r"(out)
: "memory", "q0", "q1", "q2", "q3", "q4", "q5",
"q6", "q7", "q8", "q9", "q10" // clobbered
) ;
}
#endif // WEBP_USE_NEON
//------------------------------------------------------------------------------
@ -354,6 +442,7 @@ void VP8EncDspInitNEON(void) {
VP8FTransform = FTransform;
VP8ITransformWHT = ITransformWHT;
VP8FTransformWHT = FTransformWHT;
#endif // WEBP_USE_NEON
}