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Diffstat (limited to '')
-rw-r--r-- | media/libvpx/libvpx/vpx_dsp/ppc/quantize_vsx.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_dsp/ppc/quantize_vsx.c b/media/libvpx/libvpx/vpx_dsp/ppc/quantize_vsx.c new file mode 100644 index 0000000000..ab71f6e235 --- /dev/null +++ b/media/libvpx/libvpx/vpx_dsp/ppc/quantize_vsx.c @@ -0,0 +1,301 @@ +/* + * Copyright (c) 2018 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 <assert.h> + +#include "./vpx_dsp_rtcd.h" +#include "vpx_dsp/ppc/types_vsx.h" + +// Negate 16-bit integers in a when the corresponding signed 16-bit +// integer in b is negative. +static INLINE int16x8_t vec_sign(int16x8_t a, int16x8_t b) { + const int16x8_t mask = vec_sra(b, vec_shift_sign_s16); + return vec_xor(vec_add(a, mask), mask); +} + +// Sets the value of a 32-bit integers to 1 when the corresponding value in a is +// negative. +static INLINE int32x4_t vec_is_neg(int32x4_t a) { + return vec_sr(a, vec_shift_sign_s32); +} + +// Multiply the packed 16-bit integers in a and b, producing intermediate 32-bit +// integers, and return the high 16 bits of the intermediate integers. +// (a * b) >> 16 +static INLINE int16x8_t vec_mulhi(int16x8_t a, int16x8_t b) { + // madds does ((A * B) >>15) + C, we need >> 16, so we perform an extra right + // shift. + return vec_sra(vec_madds(a, b, vec_zeros_s16), vec_ones_u16); +} + +// Quantization function used for 4x4, 8x8 and 16x16 blocks. +static INLINE int16x8_t quantize_coeff(int16x8_t coeff, int16x8_t coeff_abs, + int16x8_t round, int16x8_t quant, + int16x8_t quant_shift, bool16x8_t mask) { + const int16x8_t rounded = vec_vaddshs(coeff_abs, round); + int16x8_t qcoeff = vec_mulhi(rounded, quant); + qcoeff = vec_add(qcoeff, rounded); + qcoeff = vec_mulhi(qcoeff, quant_shift); + qcoeff = vec_sign(qcoeff, coeff); + return vec_and(qcoeff, mask); +} + +// Quantization function used for 32x32 blocks. +static INLINE int16x8_t quantize_coeff_32(int16x8_t coeff, int16x8_t coeff_abs, + int16x8_t round, int16x8_t quant, + int16x8_t quant_shift, + bool16x8_t mask) { + const int16x8_t rounded = vec_vaddshs(coeff_abs, round); + int16x8_t qcoeff = vec_mulhi(rounded, quant); + qcoeff = vec_add(qcoeff, rounded); + // 32x32 blocks require an extra multiplication by 2, this compensates for the + // extra right shift added in vec_mulhi, as such vec_madds can be used + // directly instead of vec_mulhi (((a * b) >> 15) >> 1) << 1 == (a * b >> 15) + qcoeff = vec_madds(qcoeff, quant_shift, vec_zeros_s16); + qcoeff = vec_sign(qcoeff, coeff); + return vec_and(qcoeff, mask); +} + +// DeQuantization function used for 32x32 blocks. Quantized coeff of 32x32 +// blocks are twice as big as for other block sizes. As such, using +// vec_mladd results in overflow. +static INLINE int16x8_t dequantize_coeff_32(int16x8_t qcoeff, + int16x8_t dequant) { + int32x4_t dqcoeffe = vec_mule(qcoeff, dequant); + int32x4_t dqcoeffo = vec_mulo(qcoeff, dequant); + // Add 1 if negative to round towards zero because the C uses division. + dqcoeffe = vec_add(dqcoeffe, vec_is_neg(dqcoeffe)); + dqcoeffo = vec_add(dqcoeffo, vec_is_neg(dqcoeffo)); + dqcoeffe = vec_sra(dqcoeffe, vec_ones_u32); + dqcoeffo = vec_sra(dqcoeffo, vec_ones_u32); + return (int16x8_t)vec_perm(dqcoeffe, dqcoeffo, vec_perm_odd_even_pack); +} + +static INLINE int16x8_t nonzero_scanindex(int16x8_t qcoeff, + const int16_t *iscan_ptr, int index) { + int16x8_t scan = vec_vsx_ld(index, iscan_ptr); + bool16x8_t zero_coeff = vec_cmpeq(qcoeff, vec_zeros_s16); + return vec_andc(scan, zero_coeff); +} + +// Compare packed 16-bit integers across a, and return the maximum value in +// every element. Returns a vector containing the biggest value across vector a. +static INLINE int16x8_t vec_max_across(int16x8_t a) { + a = vec_max(a, vec_perm(a, a, vec_perm64)); + a = vec_max(a, vec_perm(a, a, vec_perm32)); + return vec_max(a, vec_perm(a, a, vec_perm16)); +} + +void vpx_quantize_b_vsx(const tran_low_t *coeff_ptr, intptr_t n_coeffs, + 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) { + int16x8_t qcoeff0, qcoeff1, dqcoeff0, dqcoeff1, eob; + bool16x8_t zero_mask0, zero_mask1; + + // First set of 8 coeff starts with DC + 7 AC + int16x8_t zbin = vec_vsx_ld(0, zbin_ptr); + int16x8_t round = vec_vsx_ld(0, round_ptr); + int16x8_t quant = vec_vsx_ld(0, quant_ptr); + int16x8_t dequant = vec_vsx_ld(0, dequant_ptr); + int16x8_t quant_shift = vec_vsx_ld(0, quant_shift_ptr); + + int16x8_t coeff0 = vec_vsx_ld(0, coeff_ptr); + int16x8_t coeff1 = vec_vsx_ld(16, coeff_ptr); + + int16x8_t coeff0_abs = vec_abs(coeff0); + int16x8_t coeff1_abs = vec_abs(coeff1); + + zero_mask0 = vec_cmpge(coeff0_abs, zbin); + zbin = vec_splat(zbin, 1); + zero_mask1 = vec_cmpge(coeff1_abs, zbin); + + (void)scan_ptr; + + qcoeff0 = + quantize_coeff(coeff0, coeff0_abs, round, quant, quant_shift, zero_mask0); + vec_vsx_st(qcoeff0, 0, qcoeff_ptr); + round = vec_splat(round, 1); + quant = vec_splat(quant, 1); + quant_shift = vec_splat(quant_shift, 1); + qcoeff1 = + quantize_coeff(coeff1, coeff1_abs, round, quant, quant_shift, zero_mask1); + vec_vsx_st(qcoeff1, 16, qcoeff_ptr); + + dqcoeff0 = vec_mladd(qcoeff0, dequant, vec_zeros_s16); + vec_vsx_st(dqcoeff0, 0, dqcoeff_ptr); + dequant = vec_splat(dequant, 1); + dqcoeff1 = vec_mladd(qcoeff1, dequant, vec_zeros_s16); + vec_vsx_st(dqcoeff1, 16, dqcoeff_ptr); + + eob = vec_max(nonzero_scanindex(qcoeff0, iscan_ptr, 0), + nonzero_scanindex(qcoeff1, iscan_ptr, 16)); + + if (n_coeffs > 16) { + int index = 16; + int off0 = 32; + int off1 = 48; + int off2 = 64; + do { + int16x8_t coeff2, coeff2_abs, qcoeff2, dqcoeff2, eob2; + bool16x8_t zero_mask2; + coeff0 = vec_vsx_ld(off0, coeff_ptr); + coeff1 = vec_vsx_ld(off1, coeff_ptr); + coeff2 = vec_vsx_ld(off2, coeff_ptr); + coeff0_abs = vec_abs(coeff0); + coeff1_abs = vec_abs(coeff1); + coeff2_abs = vec_abs(coeff2); + zero_mask0 = vec_cmpge(coeff0_abs, zbin); + zero_mask1 = vec_cmpge(coeff1_abs, zbin); + zero_mask2 = vec_cmpge(coeff2_abs, zbin); + qcoeff0 = quantize_coeff(coeff0, coeff0_abs, round, quant, quant_shift, + zero_mask0); + qcoeff1 = quantize_coeff(coeff1, coeff1_abs, round, quant, quant_shift, + zero_mask1); + qcoeff2 = quantize_coeff(coeff2, coeff2_abs, round, quant, quant_shift, + zero_mask2); + vec_vsx_st(qcoeff0, off0, qcoeff_ptr); + vec_vsx_st(qcoeff1, off1, qcoeff_ptr); + vec_vsx_st(qcoeff2, off2, qcoeff_ptr); + + dqcoeff0 = vec_mladd(qcoeff0, dequant, vec_zeros_s16); + dqcoeff1 = vec_mladd(qcoeff1, dequant, vec_zeros_s16); + dqcoeff2 = vec_mladd(qcoeff2, dequant, vec_zeros_s16); + + vec_vsx_st(dqcoeff0, off0, dqcoeff_ptr); + vec_vsx_st(dqcoeff1, off1, dqcoeff_ptr); + vec_vsx_st(dqcoeff2, off2, dqcoeff_ptr); + + eob = vec_max(eob, nonzero_scanindex(qcoeff0, iscan_ptr, off0)); + eob2 = vec_max(nonzero_scanindex(qcoeff1, iscan_ptr, off1), + nonzero_scanindex(qcoeff2, iscan_ptr, off2)); + eob = vec_max(eob, eob2); + + index += 24; + off0 += 48; + off1 += 48; + off2 += 48; + } while (index < n_coeffs); + } + + eob = vec_max_across(eob); + *eob_ptr = eob[0]; +} + +void vpx_quantize_b_32x32_vsx(const tran_low_t *coeff_ptr, intptr_t n_coeffs, + 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) { + // In stage 1, we quantize 16 coeffs (DC + 15 AC) + // In stage 2, we loop 42 times and quantize 24 coeffs per iteration + // (32 * 32 - 16) / 24 = 42 + int num_itr = 42; + // Offsets are in bytes, 16 coeffs = 32 bytes + int off0 = 32; + int off1 = 48; + int off2 = 64; + + int16x8_t qcoeff0, qcoeff1, eob; + bool16x8_t zero_mask0, zero_mask1; + + int16x8_t zbin = vec_vsx_ld(0, zbin_ptr); + int16x8_t round = vec_vsx_ld(0, round_ptr); + int16x8_t quant = vec_vsx_ld(0, quant_ptr); + int16x8_t dequant = vec_vsx_ld(0, dequant_ptr); + int16x8_t quant_shift = vec_vsx_ld(0, quant_shift_ptr); + + int16x8_t coeff0 = vec_vsx_ld(0, coeff_ptr); + int16x8_t coeff1 = vec_vsx_ld(16, coeff_ptr); + + int16x8_t coeff0_abs = vec_abs(coeff0); + int16x8_t coeff1_abs = vec_abs(coeff1); + + (void)scan_ptr; + (void)n_coeffs; + + // 32x32 quantization requires that zbin and round be divided by 2 + zbin = vec_sra(vec_add(zbin, vec_ones_s16), vec_ones_u16); + round = vec_sra(vec_add(round, vec_ones_s16), vec_ones_u16); + + zero_mask0 = vec_cmpge(coeff0_abs, zbin); + zbin = vec_splat(zbin, 1); // remove DC from zbin + zero_mask1 = vec_cmpge(coeff1_abs, zbin); + + qcoeff0 = quantize_coeff_32(coeff0, coeff0_abs, round, quant, quant_shift, + zero_mask0); + round = vec_splat(round, 1); // remove DC from round + quant = vec_splat(quant, 1); // remove DC from quant + quant_shift = vec_splat(quant_shift, 1); // remove DC from quant_shift + qcoeff1 = quantize_coeff_32(coeff1, coeff1_abs, round, quant, quant_shift, + zero_mask1); + + vec_vsx_st(qcoeff0, 0, qcoeff_ptr); + vec_vsx_st(qcoeff1, 16, qcoeff_ptr); + + vec_vsx_st(dequantize_coeff_32(qcoeff0, dequant), 0, dqcoeff_ptr); + dequant = vec_splat(dequant, 1); // remove DC from dequant + vec_vsx_st(dequantize_coeff_32(qcoeff1, dequant), 16, dqcoeff_ptr); + + eob = vec_max(nonzero_scanindex(qcoeff0, iscan_ptr, 0), + nonzero_scanindex(qcoeff1, iscan_ptr, 16)); + + do { + int16x8_t coeff2, coeff2_abs, qcoeff2, eob2; + bool16x8_t zero_mask2; + + coeff0 = vec_vsx_ld(off0, coeff_ptr); + coeff1 = vec_vsx_ld(off1, coeff_ptr); + coeff2 = vec_vsx_ld(off2, coeff_ptr); + + coeff0_abs = vec_abs(coeff0); + coeff1_abs = vec_abs(coeff1); + coeff2_abs = vec_abs(coeff2); + + zero_mask0 = vec_cmpge(coeff0_abs, zbin); + zero_mask1 = vec_cmpge(coeff1_abs, zbin); + zero_mask2 = vec_cmpge(coeff2_abs, zbin); + + qcoeff0 = quantize_coeff_32(coeff0, coeff0_abs, round, quant, quant_shift, + zero_mask0); + qcoeff1 = quantize_coeff_32(coeff1, coeff1_abs, round, quant, quant_shift, + zero_mask1); + qcoeff2 = quantize_coeff_32(coeff2, coeff2_abs, round, quant, quant_shift, + zero_mask2); + + vec_vsx_st(qcoeff0, off0, qcoeff_ptr); + vec_vsx_st(qcoeff1, off1, qcoeff_ptr); + vec_vsx_st(qcoeff2, off2, qcoeff_ptr); + + vec_vsx_st(dequantize_coeff_32(qcoeff0, dequant), off0, dqcoeff_ptr); + vec_vsx_st(dequantize_coeff_32(qcoeff1, dequant), off1, dqcoeff_ptr); + vec_vsx_st(dequantize_coeff_32(qcoeff2, dequant), off2, dqcoeff_ptr); + + eob = vec_max(eob, nonzero_scanindex(qcoeff0, iscan_ptr, off0)); + eob2 = vec_max(nonzero_scanindex(qcoeff1, iscan_ptr, off1), + nonzero_scanindex(qcoeff2, iscan_ptr, off2)); + eob = vec_max(eob, eob2); + + // 24 int16_t is 48 bytes + off0 += 48; + off1 += 48; + off2 += 48; + num_itr--; + } while (num_itr != 0); + + eob = vec_max_across(eob); + *eob_ptr = eob[0]; +} |