--- /dev/null
+/*
+ * 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);
+}
+
+// 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.
+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_s16);
+}
+
+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) {
+ int16x8_t rounded, qcoeff;
+ rounded = vec_vaddshs(coeff_abs, round);
+ 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);
+}
+
+static INLINE int16x8_t nonzero_scanindex(int16x8_t qcoeff, bool16x8_t mask,
+ const int16_t *iscan_ptr) {
+ bool16x8_t zero_coeff;
+ int16x8_t scan = vec_vsx_ld(0, iscan_ptr);
+ zero_coeff = vec_cmpeq(qcoeff, vec_zeros_s16);
+ scan = vec_sub(scan, mask);
+ 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,
+ 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) {
+ int16x8_t qcoeff, dqcoeff, eob;
+
+ // 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 coeff = vec_vsx_ld(0, coeff_ptr);
+ int16x8_t coeff_abs = vec_abs(coeff);
+ bool16x8_t zero_mask = vec_cmpge(coeff_abs, zbin);
+
+ (void)scan_ptr;
+ (void)skip_block;
+ assert(!skip_block);
+
+ qcoeff =
+ quantize_coeff(coeff, coeff_abs, round, quant, quant_shift, zero_mask);
+ vec_vsx_st(qcoeff, 0, qcoeff_ptr);
+
+ dqcoeff = vec_mladd(qcoeff, dequant, vec_zeros_s16);
+ vec_vsx_st(dqcoeff, 0, dqcoeff_ptr);
+
+ eob = nonzero_scanindex(qcoeff, zero_mask, iscan_ptr);
+
+ // All other sets of 8 coeffs will only contain AC
+ zbin = vec_splat(zbin, 1);
+ round = vec_splat(round, 1);
+ quant = vec_splat(quant, 1);
+ dequant = vec_splat(dequant, 1);
+ quant_shift = vec_splat(quant_shift, 1);
+
+ n_coeffs -= 8;
+ do {
+ coeff_ptr += 8;
+ qcoeff_ptr += 8;
+ dqcoeff_ptr += 8;
+ iscan_ptr += 8;
+
+ coeff = vec_vsx_ld(0, coeff_ptr);
+ coeff_abs = vec_abs(coeff);
+ zero_mask = vec_cmpge(coeff_abs, zbin);
+ qcoeff =
+ quantize_coeff(coeff, coeff_abs, round, quant, quant_shift, zero_mask);
+ vec_vsx_st(qcoeff, 0, qcoeff_ptr);
+
+ dqcoeff = vec_mladd(qcoeff, dequant, vec_zeros_s16);
+ vec_vsx_st(dqcoeff, 0, dqcoeff_ptr);
+
+ eob = vec_max(eob, nonzero_scanindex(qcoeff, zero_mask, iscan_ptr));
+
+ n_coeffs -= 8;
+ } while (n_coeffs > 0);
+
+ eob = vec_max_across(eob);
+ *eob_ptr = eob[0];
+}
typedef vector unsigned short uint16x8_t;
typedef vector signed int int32x4_t;
typedef vector unsigned int uint32x4_t;
+typedef vector bool short bool16x8_t;
#ifdef __clang__
static const uint8x16_t xxpermdi0_perm = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
#endif
#endif
+static const int16x8_t vec_zeros_s16 = { 0, 0, 0, 0, 0, 0, 0, 0 };
+static const uint16x8_t vec_ones_s16 = { 1, 1, 1, 1, 1, 1, 1, 1 };
+static const uint16x8_t vec_shift_sign_s16 = { 15, 15, 15, 15, 15, 15, 15, 15 };
+static const uint8x16_t vec_perm64 = { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D,
+ 0x0E, 0x0F, 0x00, 0x01, 0x02, 0x03,
+ 0x04, 0x05, 0x06, 0x07 };
+static const uint8x16_t vec_perm32 = { 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
+ 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+ 0x00, 0x01, 0x02, 0x03 };
+static const uint8x16_t vec_perm16 = { 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0A, 0x0B, 0x0E, 0x0D,
+ 0x0E, 0x0F, 0x00, 0x01 };
+
#endif // VPX_DSP_PPC_TYPES_VSX_H_
projects / libvpx / commitdiff