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-rw-r--r--media/libjpeg/simd/arm/jcphuff-neon.c623
1 files changed, 623 insertions, 0 deletions
diff --git a/media/libjpeg/simd/arm/jcphuff-neon.c b/media/libjpeg/simd/arm/jcphuff-neon.c
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+/*
+ * jcphuff-neon.c - prepare data for progressive Huffman encoding (Arm Neon)
+ *
+ * Copyright (C) 2020-2021, Arm Limited. All Rights Reserved.
+ * Copyright (C) 2022, Matthieu Darbois. All Rights Reserved.
+ * Copyright (C) 2022, D. R. Commander. All Rights Reserved.
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+
+#define JPEG_INTERNALS
+#include "../../jinclude.h"
+#include "../../jpeglib.h"
+#include "../../jsimd.h"
+#include "../../jdct.h"
+#include "../../jsimddct.h"
+#include "../jsimd.h"
+#include "neon-compat.h"
+
+#include <arm_neon.h>
+
+
+/* Data preparation for encode_mcu_AC_first().
+ *
+ * The equivalent scalar C function (encode_mcu_AC_first_prepare()) can be
+ * found in jcphuff.c.
+ */
+
+void jsimd_encode_mcu_AC_first_prepare_neon
+ (const JCOEF *block, const int *jpeg_natural_order_start, int Sl, int Al,
+ UJCOEF *values, size_t *zerobits)
+{
+ UJCOEF *values_ptr = values;
+ UJCOEF *diff_values_ptr = values + DCTSIZE2;
+
+ /* Rows of coefficients to zero (since they haven't been processed) */
+ int i, rows_to_zero = 8;
+
+ for (i = 0; i < Sl / 16; i++) {
+ int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
+ int16x8_t coefs2 = vld1q_dup_s16(block + jpeg_natural_order_start[8]);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[15], coefs2, 7);
+
+ /* Isolate sign of coefficients. */
+ uint16x8_t sign_coefs1 = vreinterpretq_u16_s16(vshrq_n_s16(coefs1, 15));
+ uint16x8_t sign_coefs2 = vreinterpretq_u16_s16(vshrq_n_s16(coefs2, 15));
+ /* Compute absolute value of coefficients and apply point transform Al. */
+ uint16x8_t abs_coefs1 = vreinterpretq_u16_s16(vabsq_s16(coefs1));
+ uint16x8_t abs_coefs2 = vreinterpretq_u16_s16(vabsq_s16(coefs2));
+ abs_coefs1 = vshlq_u16(abs_coefs1, vdupq_n_s16(-Al));
+ abs_coefs2 = vshlq_u16(abs_coefs2, vdupq_n_s16(-Al));
+
+ /* Compute diff values. */
+ uint16x8_t diff1 = veorq_u16(abs_coefs1, sign_coefs1);
+ uint16x8_t diff2 = veorq_u16(abs_coefs2, sign_coefs2);
+
+ /* Store transformed coefficients and diff values. */
+ vst1q_u16(values_ptr, abs_coefs1);
+ vst1q_u16(values_ptr + DCTSIZE, abs_coefs2);
+ vst1q_u16(diff_values_ptr, diff1);
+ vst1q_u16(diff_values_ptr + DCTSIZE, diff2);
+ values_ptr += 16;
+ diff_values_ptr += 16;
+ jpeg_natural_order_start += 16;
+ rows_to_zero -= 2;
+ }
+
+ /* Same operation but for remaining partial vector */
+ int remaining_coefs = Sl % 16;
+ if (remaining_coefs > 8) {
+ int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
+ int16x8_t coefs2 = vdupq_n_s16(0);
+ switch (remaining_coefs) {
+ case 15:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 14:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 13:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 12:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 11:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 10:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 9:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[8], coefs2, 0);
+ FALLTHROUGH /*FALLTHROUGH*/
+ default:
+ break;
+ }
+
+ /* Isolate sign of coefficients. */
+ uint16x8_t sign_coefs1 = vreinterpretq_u16_s16(vshrq_n_s16(coefs1, 15));
+ uint16x8_t sign_coefs2 = vreinterpretq_u16_s16(vshrq_n_s16(coefs2, 15));
+ /* Compute absolute value of coefficients and apply point transform Al. */
+ uint16x8_t abs_coefs1 = vreinterpretq_u16_s16(vabsq_s16(coefs1));
+ uint16x8_t abs_coefs2 = vreinterpretq_u16_s16(vabsq_s16(coefs2));
+ abs_coefs1 = vshlq_u16(abs_coefs1, vdupq_n_s16(-Al));
+ abs_coefs2 = vshlq_u16(abs_coefs2, vdupq_n_s16(-Al));
+
+ /* Compute diff values. */
+ uint16x8_t diff1 = veorq_u16(abs_coefs1, sign_coefs1);
+ uint16x8_t diff2 = veorq_u16(abs_coefs2, sign_coefs2);
+
+ /* Store transformed coefficients and diff values. */
+ vst1q_u16(values_ptr, abs_coefs1);
+ vst1q_u16(values_ptr + DCTSIZE, abs_coefs2);
+ vst1q_u16(diff_values_ptr, diff1);
+ vst1q_u16(diff_values_ptr + DCTSIZE, diff2);
+ values_ptr += 16;
+ diff_values_ptr += 16;
+ rows_to_zero -= 2;
+
+ } else if (remaining_coefs > 0) {
+ int16x8_t coefs = vdupq_n_s16(0);
+
+ switch (remaining_coefs) {
+ case 8:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs, 7);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 7:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs, 6);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 6:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs, 5);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 5:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs, 4);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 4:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs, 3);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 3:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs, 2);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 2:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs, 1);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 1:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[0], coefs, 0);
+ FALLTHROUGH /*FALLTHROUGH*/
+ default:
+ break;
+ }
+
+ /* Isolate sign of coefficients. */
+ uint16x8_t sign_coefs = vreinterpretq_u16_s16(vshrq_n_s16(coefs, 15));
+ /* Compute absolute value of coefficients and apply point transform Al. */
+ uint16x8_t abs_coefs = vreinterpretq_u16_s16(vabsq_s16(coefs));
+ abs_coefs = vshlq_u16(abs_coefs, vdupq_n_s16(-Al));
+
+ /* Compute diff values. */
+ uint16x8_t diff = veorq_u16(abs_coefs, sign_coefs);
+
+ /* Store transformed coefficients and diff values. */
+ vst1q_u16(values_ptr, abs_coefs);
+ vst1q_u16(diff_values_ptr, diff);
+ values_ptr += 8;
+ diff_values_ptr += 8;
+ rows_to_zero--;
+ }
+
+ /* Zero remaining memory in the values and diff_values blocks. */
+ for (i = 0; i < rows_to_zero; i++) {
+ vst1q_u16(values_ptr, vdupq_n_u16(0));
+ vst1q_u16(diff_values_ptr, vdupq_n_u16(0));
+ values_ptr += 8;
+ diff_values_ptr += 8;
+ }
+
+ /* Construct zerobits bitmap. A set bit means that the corresponding
+ * coefficient != 0.
+ */
+ uint16x8_t row0 = vld1q_u16(values + 0 * DCTSIZE);
+ uint16x8_t row1 = vld1q_u16(values + 1 * DCTSIZE);
+ uint16x8_t row2 = vld1q_u16(values + 2 * DCTSIZE);
+ uint16x8_t row3 = vld1q_u16(values + 3 * DCTSIZE);
+ uint16x8_t row4 = vld1q_u16(values + 4 * DCTSIZE);
+ uint16x8_t row5 = vld1q_u16(values + 5 * DCTSIZE);
+ uint16x8_t row6 = vld1q_u16(values + 6 * DCTSIZE);
+ uint16x8_t row7 = vld1q_u16(values + 7 * DCTSIZE);
+
+ uint8x8_t row0_eq0 = vmovn_u16(vceqq_u16(row0, vdupq_n_u16(0)));
+ uint8x8_t row1_eq0 = vmovn_u16(vceqq_u16(row1, vdupq_n_u16(0)));
+ uint8x8_t row2_eq0 = vmovn_u16(vceqq_u16(row2, vdupq_n_u16(0)));
+ uint8x8_t row3_eq0 = vmovn_u16(vceqq_u16(row3, vdupq_n_u16(0)));
+ uint8x8_t row4_eq0 = vmovn_u16(vceqq_u16(row4, vdupq_n_u16(0)));
+ uint8x8_t row5_eq0 = vmovn_u16(vceqq_u16(row5, vdupq_n_u16(0)));
+ uint8x8_t row6_eq0 = vmovn_u16(vceqq_u16(row6, vdupq_n_u16(0)));
+ uint8x8_t row7_eq0 = vmovn_u16(vceqq_u16(row7, vdupq_n_u16(0)));
+
+ /* { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 } */
+ const uint8x8_t bitmap_mask =
+ vreinterpret_u8_u64(vmov_n_u64(0x8040201008040201));
+
+ row0_eq0 = vand_u8(row0_eq0, bitmap_mask);
+ row1_eq0 = vand_u8(row1_eq0, bitmap_mask);
+ row2_eq0 = vand_u8(row2_eq0, bitmap_mask);
+ row3_eq0 = vand_u8(row3_eq0, bitmap_mask);
+ row4_eq0 = vand_u8(row4_eq0, bitmap_mask);
+ row5_eq0 = vand_u8(row5_eq0, bitmap_mask);
+ row6_eq0 = vand_u8(row6_eq0, bitmap_mask);
+ row7_eq0 = vand_u8(row7_eq0, bitmap_mask);
+
+ uint8x8_t bitmap_rows_01 = vpadd_u8(row0_eq0, row1_eq0);
+ uint8x8_t bitmap_rows_23 = vpadd_u8(row2_eq0, row3_eq0);
+ uint8x8_t bitmap_rows_45 = vpadd_u8(row4_eq0, row5_eq0);
+ uint8x8_t bitmap_rows_67 = vpadd_u8(row6_eq0, row7_eq0);
+ uint8x8_t bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
+ uint8x8_t bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
+ uint8x8_t bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
+
+#if defined(__aarch64__) || defined(_M_ARM64)
+ /* Move bitmap to a 64-bit scalar register. */
+ uint64_t bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
+ /* Store zerobits bitmap. */
+ *zerobits = ~bitmap;
+#else
+ /* Move bitmap to two 32-bit scalar registers. */
+ uint32_t bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
+ uint32_t bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
+ /* Store zerobits bitmap. */
+ zerobits[0] = ~bitmap0;
+ zerobits[1] = ~bitmap1;
+#endif
+}
+
+
+/* Data preparation for encode_mcu_AC_refine().
+ *
+ * The equivalent scalar C function (encode_mcu_AC_refine_prepare()) can be
+ * found in jcphuff.c.
+ */
+
+int jsimd_encode_mcu_AC_refine_prepare_neon
+ (const JCOEF *block, const int *jpeg_natural_order_start, int Sl, int Al,
+ UJCOEF *absvalues, size_t *bits)
+{
+ /* Temporary storage buffers for data used to compute the signbits bitmap and
+ * the end-of-block (EOB) position
+ */
+ uint8_t coef_sign_bits[64];
+ uint8_t coef_eq1_bits[64];
+
+ UJCOEF *absvalues_ptr = absvalues;
+ uint8_t *coef_sign_bits_ptr = coef_sign_bits;
+ uint8_t *eq1_bits_ptr = coef_eq1_bits;
+
+ /* Rows of coefficients to zero (since they haven't been processed) */
+ int i, rows_to_zero = 8;
+
+ for (i = 0; i < Sl / 16; i++) {
+ int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
+ int16x8_t coefs2 = vld1q_dup_s16(block + jpeg_natural_order_start[8]);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[15], coefs2, 7);
+
+ /* Compute and store data for signbits bitmap. */
+ uint8x8_t sign_coefs1 =
+ vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs1, 15)));
+ uint8x8_t sign_coefs2 =
+ vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs2, 15)));
+ vst1_u8(coef_sign_bits_ptr, sign_coefs1);
+ vst1_u8(coef_sign_bits_ptr + DCTSIZE, sign_coefs2);
+
+ /* Compute absolute value of coefficients and apply point transform Al. */
+ uint16x8_t abs_coefs1 = vreinterpretq_u16_s16(vabsq_s16(coefs1));
+ uint16x8_t abs_coefs2 = vreinterpretq_u16_s16(vabsq_s16(coefs2));
+ abs_coefs1 = vshlq_u16(abs_coefs1, vdupq_n_s16(-Al));
+ abs_coefs2 = vshlq_u16(abs_coefs2, vdupq_n_s16(-Al));
+ vst1q_u16(absvalues_ptr, abs_coefs1);
+ vst1q_u16(absvalues_ptr + DCTSIZE, abs_coefs2);
+
+ /* Test whether transformed coefficient values == 1 (used to find EOB
+ * position.)
+ */
+ uint8x8_t coefs_eq11 = vmovn_u16(vceqq_u16(abs_coefs1, vdupq_n_u16(1)));
+ uint8x8_t coefs_eq12 = vmovn_u16(vceqq_u16(abs_coefs2, vdupq_n_u16(1)));
+ vst1_u8(eq1_bits_ptr, coefs_eq11);
+ vst1_u8(eq1_bits_ptr + DCTSIZE, coefs_eq12);
+
+ absvalues_ptr += 16;
+ coef_sign_bits_ptr += 16;
+ eq1_bits_ptr += 16;
+ jpeg_natural_order_start += 16;
+ rows_to_zero -= 2;
+ }
+
+ /* Same operation but for remaining partial vector */
+ int remaining_coefs = Sl % 16;
+ if (remaining_coefs > 8) {
+ int16x8_t coefs1 = vld1q_dup_s16(block + jpeg_natural_order_start[0]);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs1, 1);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs1, 2);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs1, 3);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs1, 4);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs1, 5);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs1, 6);
+ coefs1 = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs1, 7);
+ int16x8_t coefs2 = vdupq_n_s16(0);
+ switch (remaining_coefs) {
+ case 15:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[14], coefs2, 6);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 14:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[13], coefs2, 5);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 13:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[12], coefs2, 4);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 12:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[11], coefs2, 3);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 11:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[10], coefs2, 2);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 10:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[9], coefs2, 1);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 9:
+ coefs2 = vld1q_lane_s16(block + jpeg_natural_order_start[8], coefs2, 0);
+ FALLTHROUGH /*FALLTHROUGH*/
+ default:
+ break;
+ }
+
+ /* Compute and store data for signbits bitmap. */
+ uint8x8_t sign_coefs1 =
+ vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs1, 15)));
+ uint8x8_t sign_coefs2 =
+ vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs2, 15)));
+ vst1_u8(coef_sign_bits_ptr, sign_coefs1);
+ vst1_u8(coef_sign_bits_ptr + DCTSIZE, sign_coefs2);
+
+ /* Compute absolute value of coefficients and apply point transform Al. */
+ uint16x8_t abs_coefs1 = vreinterpretq_u16_s16(vabsq_s16(coefs1));
+ uint16x8_t abs_coefs2 = vreinterpretq_u16_s16(vabsq_s16(coefs2));
+ abs_coefs1 = vshlq_u16(abs_coefs1, vdupq_n_s16(-Al));
+ abs_coefs2 = vshlq_u16(abs_coefs2, vdupq_n_s16(-Al));
+ vst1q_u16(absvalues_ptr, abs_coefs1);
+ vst1q_u16(absvalues_ptr + DCTSIZE, abs_coefs2);
+
+ /* Test whether transformed coefficient values == 1 (used to find EOB
+ * position.)
+ */
+ uint8x8_t coefs_eq11 = vmovn_u16(vceqq_u16(abs_coefs1, vdupq_n_u16(1)));
+ uint8x8_t coefs_eq12 = vmovn_u16(vceqq_u16(abs_coefs2, vdupq_n_u16(1)));
+ vst1_u8(eq1_bits_ptr, coefs_eq11);
+ vst1_u8(eq1_bits_ptr + DCTSIZE, coefs_eq12);
+
+ absvalues_ptr += 16;
+ coef_sign_bits_ptr += 16;
+ eq1_bits_ptr += 16;
+ jpeg_natural_order_start += 16;
+ rows_to_zero -= 2;
+
+ } else if (remaining_coefs > 0) {
+ int16x8_t coefs = vdupq_n_s16(0);
+
+ switch (remaining_coefs) {
+ case 8:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[7], coefs, 7);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 7:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[6], coefs, 6);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 6:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[5], coefs, 5);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 5:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[4], coefs, 4);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 4:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[3], coefs, 3);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 3:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[2], coefs, 2);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 2:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[1], coefs, 1);
+ FALLTHROUGH /*FALLTHROUGH*/
+ case 1:
+ coefs = vld1q_lane_s16(block + jpeg_natural_order_start[0], coefs, 0);
+ FALLTHROUGH /*FALLTHROUGH*/
+ default:
+ break;
+ }
+
+ /* Compute and store data for signbits bitmap. */
+ uint8x8_t sign_coefs =
+ vmovn_u16(vreinterpretq_u16_s16(vshrq_n_s16(coefs, 15)));
+ vst1_u8(coef_sign_bits_ptr, sign_coefs);
+
+ /* Compute absolute value of coefficients and apply point transform Al. */
+ uint16x8_t abs_coefs = vreinterpretq_u16_s16(vabsq_s16(coefs));
+ abs_coefs = vshlq_u16(abs_coefs, vdupq_n_s16(-Al));
+ vst1q_u16(absvalues_ptr, abs_coefs);
+
+ /* Test whether transformed coefficient values == 1 (used to find EOB
+ * position.)
+ */
+ uint8x8_t coefs_eq1 = vmovn_u16(vceqq_u16(abs_coefs, vdupq_n_u16(1)));
+ vst1_u8(eq1_bits_ptr, coefs_eq1);
+
+ absvalues_ptr += 8;
+ coef_sign_bits_ptr += 8;
+ eq1_bits_ptr += 8;
+ rows_to_zero--;
+ }
+
+ /* Zero remaining memory in blocks. */
+ for (i = 0; i < rows_to_zero; i++) {
+ vst1q_u16(absvalues_ptr, vdupq_n_u16(0));
+ vst1_u8(coef_sign_bits_ptr, vdup_n_u8(0));
+ vst1_u8(eq1_bits_ptr, vdup_n_u8(0));
+ absvalues_ptr += 8;
+ coef_sign_bits_ptr += 8;
+ eq1_bits_ptr += 8;
+ }
+
+ /* Construct zerobits bitmap. */
+ uint16x8_t abs_row0 = vld1q_u16(absvalues + 0 * DCTSIZE);
+ uint16x8_t abs_row1 = vld1q_u16(absvalues + 1 * DCTSIZE);
+ uint16x8_t abs_row2 = vld1q_u16(absvalues + 2 * DCTSIZE);
+ uint16x8_t abs_row3 = vld1q_u16(absvalues + 3 * DCTSIZE);
+ uint16x8_t abs_row4 = vld1q_u16(absvalues + 4 * DCTSIZE);
+ uint16x8_t abs_row5 = vld1q_u16(absvalues + 5 * DCTSIZE);
+ uint16x8_t abs_row6 = vld1q_u16(absvalues + 6 * DCTSIZE);
+ uint16x8_t abs_row7 = vld1q_u16(absvalues + 7 * DCTSIZE);
+
+ uint8x8_t abs_row0_eq0 = vmovn_u16(vceqq_u16(abs_row0, vdupq_n_u16(0)));
+ uint8x8_t abs_row1_eq0 = vmovn_u16(vceqq_u16(abs_row1, vdupq_n_u16(0)));
+ uint8x8_t abs_row2_eq0 = vmovn_u16(vceqq_u16(abs_row2, vdupq_n_u16(0)));
+ uint8x8_t abs_row3_eq0 = vmovn_u16(vceqq_u16(abs_row3, vdupq_n_u16(0)));
+ uint8x8_t abs_row4_eq0 = vmovn_u16(vceqq_u16(abs_row4, vdupq_n_u16(0)));
+ uint8x8_t abs_row5_eq0 = vmovn_u16(vceqq_u16(abs_row5, vdupq_n_u16(0)));
+ uint8x8_t abs_row6_eq0 = vmovn_u16(vceqq_u16(abs_row6, vdupq_n_u16(0)));
+ uint8x8_t abs_row7_eq0 = vmovn_u16(vceqq_u16(abs_row7, vdupq_n_u16(0)));
+
+ /* { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 } */
+ const uint8x8_t bitmap_mask =
+ vreinterpret_u8_u64(vmov_n_u64(0x8040201008040201));
+
+ abs_row0_eq0 = vand_u8(abs_row0_eq0, bitmap_mask);
+ abs_row1_eq0 = vand_u8(abs_row1_eq0, bitmap_mask);
+ abs_row2_eq0 = vand_u8(abs_row2_eq0, bitmap_mask);
+ abs_row3_eq0 = vand_u8(abs_row3_eq0, bitmap_mask);
+ abs_row4_eq0 = vand_u8(abs_row4_eq0, bitmap_mask);
+ abs_row5_eq0 = vand_u8(abs_row5_eq0, bitmap_mask);
+ abs_row6_eq0 = vand_u8(abs_row6_eq0, bitmap_mask);
+ abs_row7_eq0 = vand_u8(abs_row7_eq0, bitmap_mask);
+
+ uint8x8_t bitmap_rows_01 = vpadd_u8(abs_row0_eq0, abs_row1_eq0);
+ uint8x8_t bitmap_rows_23 = vpadd_u8(abs_row2_eq0, abs_row3_eq0);
+ uint8x8_t bitmap_rows_45 = vpadd_u8(abs_row4_eq0, abs_row5_eq0);
+ uint8x8_t bitmap_rows_67 = vpadd_u8(abs_row6_eq0, abs_row7_eq0);
+ uint8x8_t bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
+ uint8x8_t bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
+ uint8x8_t bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
+
+#if defined(__aarch64__) || defined(_M_ARM64)
+ /* Move bitmap to a 64-bit scalar register. */
+ uint64_t bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
+ /* Store zerobits bitmap. */
+ bits[0] = ~bitmap;
+#else
+ /* Move bitmap to two 32-bit scalar registers. */
+ uint32_t bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
+ uint32_t bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
+ /* Store zerobits bitmap. */
+ bits[0] = ~bitmap0;
+ bits[1] = ~bitmap1;
+#endif
+
+ /* Construct signbits bitmap. */
+ uint8x8_t signbits_row0 = vld1_u8(coef_sign_bits + 0 * DCTSIZE);
+ uint8x8_t signbits_row1 = vld1_u8(coef_sign_bits + 1 * DCTSIZE);
+ uint8x8_t signbits_row2 = vld1_u8(coef_sign_bits + 2 * DCTSIZE);
+ uint8x8_t signbits_row3 = vld1_u8(coef_sign_bits + 3 * DCTSIZE);
+ uint8x8_t signbits_row4 = vld1_u8(coef_sign_bits + 4 * DCTSIZE);
+ uint8x8_t signbits_row5 = vld1_u8(coef_sign_bits + 5 * DCTSIZE);
+ uint8x8_t signbits_row6 = vld1_u8(coef_sign_bits + 6 * DCTSIZE);
+ uint8x8_t signbits_row7 = vld1_u8(coef_sign_bits + 7 * DCTSIZE);
+
+ signbits_row0 = vand_u8(signbits_row0, bitmap_mask);
+ signbits_row1 = vand_u8(signbits_row1, bitmap_mask);
+ signbits_row2 = vand_u8(signbits_row2, bitmap_mask);
+ signbits_row3 = vand_u8(signbits_row3, bitmap_mask);
+ signbits_row4 = vand_u8(signbits_row4, bitmap_mask);
+ signbits_row5 = vand_u8(signbits_row5, bitmap_mask);
+ signbits_row6 = vand_u8(signbits_row6, bitmap_mask);
+ signbits_row7 = vand_u8(signbits_row7, bitmap_mask);
+
+ bitmap_rows_01 = vpadd_u8(signbits_row0, signbits_row1);
+ bitmap_rows_23 = vpadd_u8(signbits_row2, signbits_row3);
+ bitmap_rows_45 = vpadd_u8(signbits_row4, signbits_row5);
+ bitmap_rows_67 = vpadd_u8(signbits_row6, signbits_row7);
+ bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
+ bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
+ bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
+
+#if defined(__aarch64__) || defined(_M_ARM64)
+ /* Move bitmap to a 64-bit scalar register. */
+ bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
+ /* Store signbits bitmap. */
+ bits[1] = ~bitmap;
+#else
+ /* Move bitmap to two 32-bit scalar registers. */
+ bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
+ bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
+ /* Store signbits bitmap. */
+ bits[2] = ~bitmap0;
+ bits[3] = ~bitmap1;
+#endif
+
+ /* Construct bitmap to find EOB position (the index of the last coefficient
+ * equal to 1.)
+ */
+ uint8x8_t row0_eq1 = vld1_u8(coef_eq1_bits + 0 * DCTSIZE);
+ uint8x8_t row1_eq1 = vld1_u8(coef_eq1_bits + 1 * DCTSIZE);
+ uint8x8_t row2_eq1 = vld1_u8(coef_eq1_bits + 2 * DCTSIZE);
+ uint8x8_t row3_eq1 = vld1_u8(coef_eq1_bits + 3 * DCTSIZE);
+ uint8x8_t row4_eq1 = vld1_u8(coef_eq1_bits + 4 * DCTSIZE);
+ uint8x8_t row5_eq1 = vld1_u8(coef_eq1_bits + 5 * DCTSIZE);
+ uint8x8_t row6_eq1 = vld1_u8(coef_eq1_bits + 6 * DCTSIZE);
+ uint8x8_t row7_eq1 = vld1_u8(coef_eq1_bits + 7 * DCTSIZE);
+
+ row0_eq1 = vand_u8(row0_eq1, bitmap_mask);
+ row1_eq1 = vand_u8(row1_eq1, bitmap_mask);
+ row2_eq1 = vand_u8(row2_eq1, bitmap_mask);
+ row3_eq1 = vand_u8(row3_eq1, bitmap_mask);
+ row4_eq1 = vand_u8(row4_eq1, bitmap_mask);
+ row5_eq1 = vand_u8(row5_eq1, bitmap_mask);
+ row6_eq1 = vand_u8(row6_eq1, bitmap_mask);
+ row7_eq1 = vand_u8(row7_eq1, bitmap_mask);
+
+ bitmap_rows_01 = vpadd_u8(row0_eq1, row1_eq1);
+ bitmap_rows_23 = vpadd_u8(row2_eq1, row3_eq1);
+ bitmap_rows_45 = vpadd_u8(row4_eq1, row5_eq1);
+ bitmap_rows_67 = vpadd_u8(row6_eq1, row7_eq1);
+ bitmap_rows_0123 = vpadd_u8(bitmap_rows_01, bitmap_rows_23);
+ bitmap_rows_4567 = vpadd_u8(bitmap_rows_45, bitmap_rows_67);
+ bitmap_all = vpadd_u8(bitmap_rows_0123, bitmap_rows_4567);
+
+#if defined(__aarch64__) || defined(_M_ARM64)
+ /* Move bitmap to a 64-bit scalar register. */
+ bitmap = vget_lane_u64(vreinterpret_u64_u8(bitmap_all), 0);
+
+ /* Return EOB position. */
+ if (bitmap == 0) {
+ /* EOB position is defined to be 0 if all coefficients != 1. */
+ return 0;
+ } else {
+ return 63 - BUILTIN_CLZLL(bitmap);
+ }
+#else
+ /* Move bitmap to two 32-bit scalar registers. */
+ bitmap0 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 0);
+ bitmap1 = vget_lane_u32(vreinterpret_u32_u8(bitmap_all), 1);
+
+ /* Return EOB position. */
+ if (bitmap0 == 0 && bitmap1 == 0) {
+ return 0;
+ } else if (bitmap1 != 0) {
+ return 63 - BUILTIN_CLZ(bitmap1);
+ } else {
+ return 31 - BUILTIN_CLZ(bitmap0);
+ }
+#endif
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 10:34:44 +0000