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_s16);
+ 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) {
- int16x8_t rounded, qcoeff;
- rounded = vec_vaddshs(coeff_abs, round);
- qcoeff = vec_mulhi(rounded, quant);
+ 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) {
+ int16x8_t dqcoeff;
+ 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);
+ dqcoeff = vec_pack(dqcoeffe, dqcoeffo);
+ return vec_perm(dqcoeff, dqcoeff, vec_perm_merge);
+}
+
static INLINE int16x8_t nonzero_scanindex(int16x8_t qcoeff, bool16x8_t mask,
const int16_t *iscan_ptr, int index) {
int16x8_t scan = vec_vsx_ld(index, iscan_ptr);
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, 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) {
+ // 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)skip_block;
+ (void)n_coeffs;
+ assert(!skip_block);
+
+ // 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, zero_mask0, iscan_ptr, 0),
+ nonzero_scanindex(qcoeff1, zero_mask1, 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, zero_mask0, iscan_ptr, off0));
+ eob2 = vec_max(nonzero_scanindex(qcoeff1, zero_mask1, iscan_ptr, off1),
+ nonzero_scanindex(qcoeff2, zero_mask2, 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];
+}
#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 int16x8_t vec_ones_s16 = { 1, 1, 1, 1, 1, 1, 1, 1 };
+static const uint16x8_t vec_ones_u16 = { 1, 1, 1, 1, 1, 1, 1, 1 };
+static const uint32x4_t vec_ones_u32 = { 1, 1, 1, 1 };
static const uint16x8_t vec_shift_sign_s16 = { 15, 15, 15, 15, 15, 15, 15, 15 };
+static const uint32x4_t vec_shift_sign_s32 = { 31, 31, 31, 31 };
static const uint8x16_t vec_perm64 = { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D,
0x0E, 0x0F, 0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07 };
0x08, 0x09, 0x0A, 0x0B, 0x0E, 0x0D,
0x0E, 0x0F, 0x00, 0x01 };
+static const uint8x16_t vec_perm_merge = { 0x00, 0x01, 0x08, 0x09, 0x02, 0x03,
+ 0x0A, 0x0B, 0x04, 0x05, 0x0C, 0x0D,
+ 0x06, 0x07, 0x0E, 0x0F };
+
#endif // VPX_DSP_PPC_TYPES_VSX_H_
projects / libvpx / commitdiff