ref: f1d44c1f45bb0828ef4a683ad42544b3c6fc3af1
dir: /vpx_dsp/arm/quantize_neon.c/
/* * Copyright (c) 2017 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #include <arm_neon.h> #include <assert.h> #include "./vpx_config.h" #include "./vpx_dsp_rtcd.h" #include "vpx_dsp/arm/mem_neon.h" void vpx_quantize_b_neon(const tran_low_t *coeff_ptr, intptr_t n_coeffs, int skip_block, const int16_t *zbin_ptr, const int16_t *round_ptr, const int16_t *quant_ptr, const int16_t *quant_shift_ptr, tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr, uint16_t *eob_ptr, const int16_t *scan_ptr, const int16_t *iscan_ptr) { const int16x8_t one = vdupq_n_s16(1); const int16x8_t neg_one = vdupq_n_s16(-1); uint16x8_t eob_max; (void)scan_ptr; (void)skip_block; assert(!skip_block); // Process first 8 values which include a dc component. { // Only the first element of each vector is DC. const int16x8_t zbin = vld1q_s16(zbin_ptr); const int16x8_t round = vld1q_s16(round_ptr); const int16x8_t quant = vld1q_s16(quant_ptr); const int16x8_t quant_shift = vld1q_s16(quant_shift_ptr); const int16x8_t dequant = vld1q_s16(dequant_ptr); // Add one because the eob does not index from 0. const uint16x8_t iscan = vreinterpretq_u16_s16(vaddq_s16(vld1q_s16(iscan_ptr), one)); const int16x8_t coeff = load_tran_low_to_s16q(coeff_ptr); const int16x8_t coeff_sign = vshrq_n_s16(coeff, 15); const int16x8_t coeff_abs = vabsq_s16(coeff); const int16x8_t zbin_mask = vreinterpretq_s16_u16(vcgeq_s16(coeff_abs, zbin)); const int16x8_t rounded = vqaddq_s16(coeff_abs, round); // (round * quant * 2) >> 16 >> 1 == (round * quant) >> 16 int16x8_t qcoeff = vshrq_n_s16(vqdmulhq_s16(rounded, quant), 1); qcoeff = vaddq_s16(qcoeff, rounded); // (qcoeff * quant_shift * 2) >> 16 >> 1 == (qcoeff * quant_shift) >> 16 qcoeff = vshrq_n_s16(vqdmulhq_s16(qcoeff, quant_shift), 1); // Restore the sign bit. qcoeff = veorq_s16(qcoeff, coeff_sign); qcoeff = vsubq_s16(qcoeff, coeff_sign); qcoeff = vandq_s16(qcoeff, zbin_mask); // Set non-zero elements to -1 and use that to extract values for eob. eob_max = vandq_u16(vtstq_s16(qcoeff, neg_one), iscan); coeff_ptr += 8; iscan_ptr += 8; store_s16q_to_tran_low(qcoeff_ptr, qcoeff); qcoeff_ptr += 8; qcoeff = vmulq_s16(qcoeff, dequant); store_s16q_to_tran_low(dqcoeff_ptr, qcoeff); dqcoeff_ptr += 8; } n_coeffs -= 8; { const int16x8_t zbin = vdupq_n_s16(zbin_ptr[1]); const int16x8_t round = vdupq_n_s16(round_ptr[1]); const int16x8_t quant = vdupq_n_s16(quant_ptr[1]); const int16x8_t quant_shift = vdupq_n_s16(quant_shift_ptr[1]); const int16x8_t dequant = vdupq_n_s16(dequant_ptr[1]); do { // Add one because the eob is not its index. const uint16x8_t iscan = vreinterpretq_u16_s16(vaddq_s16(vld1q_s16(iscan_ptr), one)); const int16x8_t coeff = load_tran_low_to_s16q(coeff_ptr); const int16x8_t coeff_sign = vshrq_n_s16(coeff, 15); const int16x8_t coeff_abs = vabsq_s16(coeff); const int16x8_t zbin_mask = vreinterpretq_s16_u16(vcgeq_s16(coeff_abs, zbin)); const int16x8_t rounded = vqaddq_s16(coeff_abs, round); // (round * quant * 2) >> 16 >> 1 == (round * quant) >> 16 int16x8_t qcoeff = vshrq_n_s16(vqdmulhq_s16(rounded, quant), 1); qcoeff = vaddq_s16(qcoeff, rounded); // (qcoeff * quant_shift * 2) >> 16 >> 1 == (qcoeff * quant_shift) >> 16 qcoeff = vshrq_n_s16(vqdmulhq_s16(qcoeff, quant_shift), 1); // Restore the sign bit. qcoeff = veorq_s16(qcoeff, coeff_sign); qcoeff = vsubq_s16(qcoeff, coeff_sign); qcoeff = vandq_s16(qcoeff, zbin_mask); // Set non-zero elements to -1 and use that to extract values for eob. eob_max = vmaxq_u16(eob_max, vandq_u16(vtstq_s16(qcoeff, neg_one), iscan)); coeff_ptr += 8; iscan_ptr += 8; store_s16q_to_tran_low(qcoeff_ptr, qcoeff); qcoeff_ptr += 8; qcoeff = vmulq_s16(qcoeff, dequant); store_s16q_to_tran_low(dqcoeff_ptr, qcoeff); dqcoeff_ptr += 8; n_coeffs -= 8; } while (n_coeffs > 0); } { const uint16x4_t eob_max_0 = vmax_u16(vget_low_u16(eob_max), vget_high_u16(eob_max)); const uint16x4_t eob_max_1 = vpmax_u16(eob_max_0, eob_max_0); const uint16x4_t eob_max_2 = vpmax_u16(eob_max_1, eob_max_1); vst1_lane_u16(eob_ptr, eob_max_2, 0); } } static INLINE int32x4_t extract_sign_bit(int32x4_t a) { return vreinterpretq_s32_u32(vshrq_n_u32(vreinterpretq_u32_s32(a), 31)); } // Main difference is that zbin values are halved before comparison and dqcoeff // values are divided by 2. zbin is rounded but dqcoeff is not. void vpx_quantize_b_32x32_neon( const tran_low_t *coeff_ptr, intptr_t n_coeffs, int skip_block, const int16_t *zbin_ptr, const int16_t *round_ptr, const int16_t *quant_ptr, const int16_t *quant_shift_ptr, tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr, uint16_t *eob_ptr, const int16_t *scan_ptr, const int16_t *iscan_ptr) { const int16x8_t one = vdupq_n_s16(1); const int16x8_t neg_one = vdupq_n_s16(-1); uint16x8_t eob_max; int i; (void)scan_ptr; (void)n_coeffs; // Because we will always calculate 32*32. (void)skip_block; assert(!skip_block); // Process first 8 values which include a dc component. { // Only the first element of each vector is DC. const int16x8_t zbin = vrshrq_n_s16(vld1q_s16(zbin_ptr), 1); const int16x8_t round = vrshrq_n_s16(vld1q_s16(round_ptr), 1); const int16x8_t quant = vld1q_s16(quant_ptr); const int16x8_t quant_shift = vld1q_s16(quant_shift_ptr); const int16x8_t dequant = vld1q_s16(dequant_ptr); // Add one because the eob does not index from 0. const uint16x8_t iscan = vreinterpretq_u16_s16(vaddq_s16(vld1q_s16(iscan_ptr), one)); const int16x8_t coeff = load_tran_low_to_s16q(coeff_ptr); const int16x8_t coeff_sign = vshrq_n_s16(coeff, 15); const int16x8_t coeff_abs = vabsq_s16(coeff); const int16x8_t zbin_mask = vreinterpretq_s16_u16(vcgeq_s16(coeff_abs, zbin)); const int16x8_t rounded = vqaddq_s16(coeff_abs, round); // (round * quant * 2) >> 16 >> 1 == (round * quant) >> 16 int16x8_t qcoeff = vshrq_n_s16(vqdmulhq_s16(rounded, quant), 1); int16x8_t dqcoeff; int32x4_t dqcoeff_0, dqcoeff_1; qcoeff = vaddq_s16(qcoeff, rounded); // (qcoeff * quant_shift * 2) >> 16 == (qcoeff * quant_shift) >> 15 qcoeff = vqdmulhq_s16(qcoeff, quant_shift); // Restore the sign bit. qcoeff = veorq_s16(qcoeff, coeff_sign); qcoeff = vsubq_s16(qcoeff, coeff_sign); qcoeff = vandq_s16(qcoeff, zbin_mask); // Set non-zero elements to -1 and use that to extract values for eob. eob_max = vandq_u16(vtstq_s16(qcoeff, neg_one), iscan); coeff_ptr += 8; iscan_ptr += 8; store_s16q_to_tran_low(qcoeff_ptr, qcoeff); qcoeff_ptr += 8; dqcoeff_0 = vmull_s16(vget_low_s16(qcoeff), vget_low_s16(dequant)); dqcoeff_1 = vmull_s16(vget_high_s16(qcoeff), vget_high_s16(dequant)); // Add 1 if negative to round towards zero because the C uses division. dqcoeff_0 = vaddq_s32(dqcoeff_0, extract_sign_bit(dqcoeff_0)); dqcoeff_1 = vaddq_s32(dqcoeff_1, extract_sign_bit(dqcoeff_1)); dqcoeff = vcombine_s16(vshrn_n_s32(dqcoeff_0, 1), vshrn_n_s32(dqcoeff_1, 1)); store_s16q_to_tran_low(dqcoeff_ptr, dqcoeff); dqcoeff_ptr += 8; } { const int16x8_t zbin = vrshrq_n_s16(vdupq_n_s16(zbin_ptr[1]), 1); const int16x8_t round = vrshrq_n_s16(vdupq_n_s16(round_ptr[1]), 1); const int16x8_t quant = vdupq_n_s16(quant_ptr[1]); const int16x8_t quant_shift = vdupq_n_s16(quant_shift_ptr[1]); const int16x8_t dequant = vdupq_n_s16(dequant_ptr[1]); for (i = 1; i < 32 * 32 / 8; ++i) { // Add one because the eob is not its index. const uint16x8_t iscan = vreinterpretq_u16_s16(vaddq_s16(vld1q_s16(iscan_ptr), one)); const int16x8_t coeff = load_tran_low_to_s16q(coeff_ptr); const int16x8_t coeff_sign = vshrq_n_s16(coeff, 15); const int16x8_t coeff_abs = vabsq_s16(coeff); const int16x8_t zbin_mask = vreinterpretq_s16_u16(vcgeq_s16(coeff_abs, zbin)); const int16x8_t rounded = vqaddq_s16(coeff_abs, round); // (round * quant * 2) >> 16 >> 1 == (round * quant) >> 16 int16x8_t qcoeff = vshrq_n_s16(vqdmulhq_s16(rounded, quant), 1); int16x8_t dqcoeff; int32x4_t dqcoeff_0, dqcoeff_1; qcoeff = vaddq_s16(qcoeff, rounded); // (qcoeff * quant_shift * 2) >> 16 == (qcoeff * quant_shift) >> 15 qcoeff = vqdmulhq_s16(qcoeff, quant_shift); // Restore the sign bit. qcoeff = veorq_s16(qcoeff, coeff_sign); qcoeff = vsubq_s16(qcoeff, coeff_sign); qcoeff = vandq_s16(qcoeff, zbin_mask); // Set non-zero elements to -1 and use that to extract values for eob. eob_max = vmaxq_u16(eob_max, vandq_u16(vtstq_s16(qcoeff, neg_one), iscan)); coeff_ptr += 8; iscan_ptr += 8; store_s16q_to_tran_low(qcoeff_ptr, qcoeff); qcoeff_ptr += 8; dqcoeff_0 = vmull_s16(vget_low_s16(qcoeff), vget_low_s16(dequant)); dqcoeff_1 = vmull_s16(vget_high_s16(qcoeff), vget_high_s16(dequant)); dqcoeff_0 = vaddq_s32(dqcoeff_0, extract_sign_bit(dqcoeff_0)); dqcoeff_1 = vaddq_s32(dqcoeff_1, extract_sign_bit(dqcoeff_1)); dqcoeff = vcombine_s16(vshrn_n_s32(dqcoeff_0, 1), vshrn_n_s32(dqcoeff_1, 1)); store_s16q_to_tran_low(dqcoeff_ptr, dqcoeff); dqcoeff_ptr += 8; } } { const uint16x4_t eob_max_0 = vmax_u16(vget_low_u16(eob_max), vget_high_u16(eob_max)); const uint16x4_t eob_max_1 = vpmax_u16(eob_max_0, eob_max_0); const uint16x4_t eob_max_2 = vpmax_u16(eob_max_1, eob_max_1); vst1_lane_u16(eob_ptr, eob_max_2, 0); } }