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+/*
+ * Copyright (c) 2016 Google Inc.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/aarch64/asm.S"
+#include "neon.S"
+
+const itxfm4_coeffs, align=4
+ .short 11585, 0, 6270, 15137
+iadst4_coeffs:
+ .short 5283, 15212, 9929, 13377
+endconst
+
+const iadst8_coeffs, align=4
+ .short 16305, 1606, 14449, 7723, 10394, 12665, 4756, 15679
+idct_coeffs:
+ .short 11585, 0, 6270, 15137, 3196, 16069, 13623, 9102
+ .short 1606, 16305, 12665, 10394, 7723, 14449, 15679, 4756
+ .short 804, 16364, 12140, 11003, 7005, 14811, 15426, 5520
+ .short 3981, 15893, 14053, 8423, 9760, 13160, 16207, 2404
+endconst
+
+const iadst16_coeffs, align=4
+ .short 16364, 804, 15893, 3981, 11003, 12140, 8423, 14053
+ .short 14811, 7005, 13160, 9760, 5520, 15426, 2404, 16207
+endconst
+
+// out1 = ((in1 + in2) * v0[0] + (1 << 13)) >> 14
+// out2 = ((in1 - in2) * v0[0] + (1 << 13)) >> 14
+// in/out are .8h registers; this can do with 4 temp registers, but is
+// more efficient if 6 temp registers are available.
+.macro dmbutterfly0 out1, out2, in1, in2, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, neg=0
+.if \neg > 0
+ neg \tmp4\().4h, v0.4h
+.endif
+ add \tmp1\().8h, \in1\().8h, \in2\().8h
+ sub \tmp2\().8h, \in1\().8h, \in2\().8h
+.if \neg > 0
+ smull \tmp3\().4s, \tmp1\().4h, \tmp4\().h[0]
+ smull2 \tmp4\().4s, \tmp1\().8h, \tmp4\().h[0]
+.else
+ smull \tmp3\().4s, \tmp1\().4h, v0.h[0]
+ smull2 \tmp4\().4s, \tmp1\().8h, v0.h[0]
+.endif
+.ifb \tmp5
+ rshrn \out1\().4h, \tmp3\().4s, #14
+ rshrn2 \out1\().8h, \tmp4\().4s, #14
+ smull \tmp3\().4s, \tmp2\().4h, v0.h[0]
+ smull2 \tmp4\().4s, \tmp2\().8h, v0.h[0]
+ rshrn \out2\().4h, \tmp3\().4s, #14
+ rshrn2 \out2\().8h, \tmp4\().4s, #14
+.else
+ smull \tmp5\().4s, \tmp2\().4h, v0.h[0]
+ smull2 \tmp6\().4s, \tmp2\().8h, v0.h[0]
+ rshrn \out1\().4h, \tmp3\().4s, #14
+ rshrn2 \out1\().8h, \tmp4\().4s, #14
+ rshrn \out2\().4h, \tmp5\().4s, #14
+ rshrn2 \out2\().8h, \tmp6\().4s, #14
+.endif
+.endm
+
+// Same as dmbutterfly0 above, but treating the input in in2 as zero,
+// writing the same output into both out1 and out2.
+.macro dmbutterfly0_h out1, out2, in1, in2, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6
+ smull \tmp1\().4s, \in1\().4h, v0.h[0]
+ smull2 \tmp2\().4s, \in1\().8h, v0.h[0]
+ rshrn \out1\().4h, \tmp1\().4s, #14
+ rshrn2 \out1\().8h, \tmp2\().4s, #14
+ rshrn \out2\().4h, \tmp1\().4s, #14
+ rshrn2 \out2\().8h, \tmp2\().4s, #14
+.endm
+
+// out1,out2 = in1 * coef1 - in2 * coef2
+// out3,out4 = in1 * coef2 + in2 * coef1
+// out are 4 x .4s registers, in are 2 x .8h registers
+.macro dmbutterfly_l out1, out2, out3, out4, in1, in2, coef1, coef2
+ smull \out1\().4s, \in1\().4h, \coef1
+ smull2 \out2\().4s, \in1\().8h, \coef1
+ smull \out3\().4s, \in1\().4h, \coef2
+ smull2 \out4\().4s, \in1\().8h, \coef2
+ smlsl \out1\().4s, \in2\().4h, \coef2
+ smlsl2 \out2\().4s, \in2\().8h, \coef2
+ smlal \out3\().4s, \in2\().4h, \coef1
+ smlal2 \out4\().4s, \in2\().8h, \coef1
+.endm
+
+// inout1 = (inout1 * coef1 - inout2 * coef2 + (1 << 13)) >> 14
+// inout2 = (inout1 * coef2 + inout2 * coef1 + (1 << 13)) >> 14
+// inout are 2 x .8h registers
+.macro dmbutterfly inout1, inout2, coef1, coef2, tmp1, tmp2, tmp3, tmp4, neg=0
+ dmbutterfly_l \tmp1, \tmp2, \tmp3, \tmp4, \inout1, \inout2, \coef1, \coef2
+.if \neg > 0
+ neg \tmp3\().4s, \tmp3\().4s
+ neg \tmp4\().4s, \tmp4\().4s
+.endif
+ rshrn \inout1\().4h, \tmp1\().4s, #14
+ rshrn2 \inout1\().8h, \tmp2\().4s, #14
+ rshrn \inout2\().4h, \tmp3\().4s, #14
+ rshrn2 \inout2\().8h, \tmp4\().4s, #14
+.endm
+
+// Same as dmbutterfly above, but treating the input in inout2 as zero
+.macro dmbutterfly_h1 inout1, inout2, coef1, coef2, tmp1, tmp2, tmp3, tmp4
+ smull \tmp1\().4s, \inout1\().4h, \coef1
+ smull2 \tmp2\().4s, \inout1\().8h, \coef1
+ smull \tmp3\().4s, \inout1\().4h, \coef2
+ smull2 \tmp4\().4s, \inout1\().8h, \coef2
+ rshrn \inout1\().4h, \tmp1\().4s, #14
+ rshrn2 \inout1\().8h, \tmp2\().4s, #14
+ rshrn \inout2\().4h, \tmp3\().4s, #14
+ rshrn2 \inout2\().8h, \tmp4\().4s, #14
+.endm
+
+// Same as dmbutterfly above, but treating the input in inout1 as zero
+.macro dmbutterfly_h2 inout1, inout2, coef1, coef2, tmp1, tmp2, tmp3, tmp4
+ smull \tmp1\().4s, \inout2\().4h, \coef2
+ smull2 \tmp2\().4s, \inout2\().8h, \coef2
+ smull \tmp3\().4s, \inout2\().4h, \coef1
+ smull2 \tmp4\().4s, \inout2\().8h, \coef1
+ neg \tmp1\().4s, \tmp1\().4s
+ neg \tmp2\().4s, \tmp2\().4s
+ rshrn \inout2\().4h, \tmp3\().4s, #14
+ rshrn2 \inout2\().8h, \tmp4\().4s, #14
+ rshrn \inout1\().4h, \tmp1\().4s, #14
+ rshrn2 \inout1\().8h, \tmp2\().4s, #14
+.endm
+
+.macro dsmull_h out1, out2, in, coef
+ smull \out1\().4s, \in\().4h, \coef
+ smull2 \out2\().4s, \in\().8h, \coef
+.endm
+
+.macro drshrn_h out, in1, in2, shift
+ rshrn \out\().4h, \in1\().4s, \shift
+ rshrn2 \out\().8h, \in2\().4s, \shift
+.endm
+
+
+// out1 = in1 + in2
+// out2 = in1 - in2
+.macro butterfly_8h out1, out2, in1, in2
+ add \out1\().8h, \in1\().8h, \in2\().8h
+ sub \out2\().8h, \in1\().8h, \in2\().8h
+.endm
+
+// out1 = in1 - in2
+// out2 = in1 + in2
+.macro butterfly_8h_r out1, out2, in1, in2
+ sub \out1\().8h, \in1\().8h, \in2\().8h
+ add \out2\().8h, \in1\().8h, \in2\().8h
+.endm
+
+// out1 = (in1,in2 + in3,in4 + (1 << 13)) >> 14
+// out2 = (in1,in2 - in3,in4 + (1 << 13)) >> 14
+// out are 2 x .8h registers, in are 4 x .4s registers
+.macro dbutterfly_n out1, out2, in1, in2, in3, in4, tmp1, tmp2, tmp3, tmp4
+ add \tmp1\().4s, \in1\().4s, \in3\().4s
+ add \tmp2\().4s, \in2\().4s, \in4\().4s
+ sub \tmp3\().4s, \in1\().4s, \in3\().4s
+ sub \tmp4\().4s, \in2\().4s, \in4\().4s
+ rshrn \out1\().4h, \tmp1\().4s, #14
+ rshrn2 \out1\().8h, \tmp2\().4s, #14
+ rshrn \out2\().4h, \tmp3\().4s, #14
+ rshrn2 \out2\().8h, \tmp4\().4s, #14
+.endm
+
+.macro iwht4 c0, c1, c2, c3
+ add \c0\().4h, \c0\().4h, \c1\().4h
+ sub v17.4h, \c2\().4h, \c3\().4h
+ sub v16.4h, \c0\().4h, v17.4h
+ sshr v16.4h, v16.4h, #1
+ sub \c2\().4h, v16.4h, \c1\().4h
+ sub \c1\().4h, v16.4h, \c3\().4h
+ add \c3\().4h, v17.4h, \c2\().4h
+ sub \c0\().4h, \c0\().4h, \c1\().4h
+.endm
+
+.macro idct4 c0, c1, c2, c3
+ smull v22.4s, \c1\().4h, v0.h[3]
+ smull v20.4s, \c1\().4h, v0.h[2]
+ add v16.4h, \c0\().4h, \c2\().4h
+ sub v17.4h, \c0\().4h, \c2\().4h
+ smlal v22.4s, \c3\().4h, v0.h[2]
+ smull v18.4s, v16.4h, v0.h[0]
+ smull v19.4s, v17.4h, v0.h[0]
+ smlsl v20.4s, \c3\().4h, v0.h[3]
+ rshrn v22.4h, v22.4s, #14
+ rshrn v18.4h, v18.4s, #14
+ rshrn v19.4h, v19.4s, #14
+ rshrn v20.4h, v20.4s, #14
+ add \c0\().4h, v18.4h, v22.4h
+ sub \c3\().4h, v18.4h, v22.4h
+ add \c1\().4h, v19.4h, v20.4h
+ sub \c2\().4h, v19.4h, v20.4h
+.endm
+
+.macro iadst4 c0, c1, c2, c3
+ smull v16.4s, \c0\().4h, v0.h[4]
+ smlal v16.4s, \c2\().4h, v0.h[5]
+ smlal v16.4s, \c3\().4h, v0.h[6]
+ smull v17.4s, \c0\().4h, v0.h[6]
+ smlsl v17.4s, \c2\().4h, v0.h[4]
+ sub \c0\().4h, \c0\().4h, \c2\().4h
+ smlsl v17.4s, \c3\().4h, v0.h[5]
+ add \c0\().4h, \c0\().4h, \c3\().4h
+ smull v19.4s, \c1\().4h, v0.h[7]
+ smull v18.4s, \c0\().4h, v0.h[7]
+ add v20.4s, v16.4s, v19.4s
+ add v21.4s, v17.4s, v19.4s
+ rshrn \c0\().4h, v20.4s, #14
+ add v16.4s, v16.4s, v17.4s
+ rshrn \c1\().4h, v21.4s, #14
+ sub v16.4s, v16.4s, v19.4s
+ rshrn \c2\().4h, v18.4s, #14
+ rshrn \c3\().4h, v16.4s, #14
+.endm
+
+// The public functions in this file have got the following signature:
+// void itxfm_add(uint8_t *dst, ptrdiff_t stride, int16_t *block, int eob);
+
+.macro itxfm_func4x4 txfm1, txfm2
+function ff_vp9_\txfm1\()_\txfm2\()_4x4_add_neon, export=1
+.ifc \txfm1,\txfm2
+.ifc \txfm1,idct
+ movrel x4, itxfm4_coeffs
+ ld1 {v0.4h}, [x4]
+.endif
+.ifc \txfm1,iadst
+ movrel x4, iadst4_coeffs
+ ld1 {v0.d}[1], [x4]
+.endif
+.else
+ movrel x4, itxfm4_coeffs
+ ld1 {v0.8h}, [x4]
+.endif
+
+ movi v31.8h, #0
+.ifc \txfm1\()_\txfm2,idct_idct
+ cmp w3, #1
+ b.ne 1f
+ // DC-only for idct/idct
+ ld1 {v2.h}[0], [x2]
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ st1 {v31.h}[0], [x2]
+ dup v4.4h, v2.h[0]
+ mov v5.16b, v4.16b
+ mov v6.16b, v4.16b
+ mov v7.16b, v4.16b
+ b 2f
+.endif
+
+1:
+ ld1 {v4.4h,v5.4h,v6.4h,v7.4h}, [x2]
+ st1 {v31.8h}, [x2], #16
+
+.ifc \txfm1,iwht
+ sshr v4.4h, v4.4h, #2
+ sshr v5.4h, v5.4h, #2
+ sshr v6.4h, v6.4h, #2
+ sshr v7.4h, v7.4h, #2
+.endif
+
+ \txfm1\()4 v4, v5, v6, v7
+
+ st1 {v31.8h}, [x2], #16
+ // Transpose 4x4 with 16 bit elements
+ transpose_4x4H v4, v5, v6, v7, v16, v17, v18, v19
+
+ \txfm2\()4 v4, v5, v6, v7
+2:
+ ld1 {v0.s}[0], [x0], x1
+ ld1 {v1.s}[0], [x0], x1
+.ifnc \txfm1,iwht
+ srshr v4.4h, v4.4h, #4
+ srshr v5.4h, v5.4h, #4
+ srshr v6.4h, v6.4h, #4
+ srshr v7.4h, v7.4h, #4
+.endif
+ uaddw v4.8h, v4.8h, v0.8b
+ uaddw v5.8h, v5.8h, v1.8b
+ ld1 {v2.s}[0], [x0], x1
+ ld1 {v3.s}[0], [x0], x1
+ sqxtun v0.8b, v4.8h
+ sqxtun v1.8b, v5.8h
+ sub x0, x0, x1, lsl #2
+
+ uaddw v6.8h, v6.8h, v2.8b
+ uaddw v7.8h, v7.8h, v3.8b
+ st1 {v0.s}[0], [x0], x1
+ sqxtun v2.8b, v6.8h
+ sqxtun v3.8b, v7.8h
+
+ st1 {v1.s}[0], [x0], x1
+ st1 {v2.s}[0], [x0], x1
+ st1 {v3.s}[0], [x0], x1
+
+ ret
+endfunc
+.endm
+
+itxfm_func4x4 idct, idct
+itxfm_func4x4 iadst, idct
+itxfm_func4x4 idct, iadst
+itxfm_func4x4 iadst, iadst
+itxfm_func4x4 iwht, iwht
+
+
+.macro idct8
+ dmbutterfly0 v16, v20, v16, v20, v2, v3, v4, v5, v6, v7 // v16 = t0a, v20 = t1a
+ dmbutterfly v18, v22, v0.h[2], v0.h[3], v2, v3, v4, v5 // v18 = t2a, v22 = t3a
+ dmbutterfly v17, v23, v0.h[4], v0.h[5], v2, v3, v4, v5 // v17 = t4a, v23 = t7a
+ dmbutterfly v21, v19, v0.h[6], v0.h[7], v2, v3, v4, v5 // v21 = t5a, v19 = t6a
+
+ butterfly_8h v24, v25, v16, v22 // v24 = t0, v25 = t3
+ butterfly_8h v28, v29, v17, v21 // v28 = t4, v29 = t5a
+ butterfly_8h v30, v31, v23, v19 // v30 = t7, v31 = t6a
+ butterfly_8h v26, v27, v20, v18 // v26 = t1, v27 = t2
+
+ dmbutterfly0 v31, v29, v31, v29, v2, v3, v4, v5, v6, v7 // v31 = t6, v29 = t5
+
+ butterfly_8h v16, v23, v24, v30 // v16 = out[0], v23 = out[7]
+ butterfly_8h v17, v22, v26, v31 // v17 = out[1], v22 = out[6]
+ butterfly_8h v18, v21, v27, v29 // q13 = out[2], q10 = out[5]
+ butterfly_8h v19, v20, v25, v28 // v17 = out[3], q12 = out[4]
+.endm
+
+.macro iadst8
+ dmbutterfly_l v24, v25, v26, v27, v23, v16, v1.h[1], v1.h[0] // v24,v25 = t1a, v26,v27 = t0a
+ dmbutterfly_l v28, v29, v30, v31, v21, v18, v1.h[3], v1.h[2] // v28,v29 = t3a, v30,v31 = t2a
+ dmbutterfly_l v2, v3, v4, v5, v19, v20, v1.h[5], v1.h[4] // v2,v3 = t5a, v4,v5 = t4a
+ dmbutterfly_l v16, v18, v21, v23, v17, v22, v1.h[7], v1.h[6] // v16,v18 = t7a, v21,v23 = t6a
+
+ dbutterfly_n v4, v5, v26, v27, v4, v5, v6, v7, v26, v27 // v4 = t0, v5 = t4
+ dbutterfly_n v2, v3, v24, v25, v2, v3, v6, v7, v26, v27 // v2 = t1, v3 = t5
+ dbutterfly_n v24, v25, v30, v31, v21, v23, v6, v7, v26, v27 // v24 = t2, v25 = t6
+ dbutterfly_n v30, v31, v28, v29, v16, v18, v6, v7, v26, v27 // v30 = t3, v31 = t7
+
+ butterfly_8h v16, v6, v4, v24 // v16 = out[0], v6 = t2
+ butterfly_8h v23, v7, v2, v30 // v23 = -out[7], v7 = t3
+ neg v23.8h, v23.8h // v23 = out[7]
+
+ dmbutterfly0 v19, v20, v6, v7, v24, v26, v27, v28, v29, v30 // v19 = -out[3], v20 = out[4]
+ neg v19.8h, v19.8h // v19 = out[3]
+
+ dmbutterfly_l v26, v27, v28, v29, v5, v3, v0.h[2], v0.h[3] // v26,v27 = t5a, v28,v29 = t4a
+ dmbutterfly_l v2, v3, v4, v5, v31, v25, v0.h[3], v0.h[2] // v2,v3 = t6a, v4,v5 = t7a
+
+ dbutterfly_n v17, v30, v28, v29, v2, v3, v6, v7, v24, v25 // v17 = -out[1], v30 = t6
+ dbutterfly_n v22, v31, v26, v27, v4, v5, v6, v7, v24, v25 // v22 = out[6], v31 = t7
+ neg v17.8h, v17.8h // v17 = out[1]
+
+ dmbutterfly0 v18, v21, v30, v31, v2, v3, v4, v5, v6, v7 // v18 = out[2], v21 = -out[5]
+ neg v21.8h, v21.8h // v21 = out[5]
+.endm
+
+
+.macro itxfm_func8x8 txfm1, txfm2
+function ff_vp9_\txfm1\()_\txfm2\()_8x8_add_neon, export=1
+ // The iadst also uses a few coefficients from
+ // idct, so those always need to be loaded.
+.ifc \txfm1\()_\txfm2,idct_idct
+ movrel x4, idct_coeffs
+.else
+ movrel x4, iadst8_coeffs
+ ld1 {v1.8h}, [x4], #16
+.endif
+ ld1 {v0.8h}, [x4]
+
+ movi v2.8h, #0
+ movi v3.8h, #0
+ movi v4.8h, #0
+ movi v5.8h, #0
+
+.ifc \txfm1\()_\txfm2,idct_idct
+ cmp w3, #1
+ b.ne 1f
+ // DC-only for idct/idct
+ ld1 {v2.h}[0], [x2]
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ st1 {v3.h}[0], [x2]
+ dup v16.8h, v2.h[0]
+ mov v17.16b, v16.16b
+ mov v18.16b, v16.16b
+ mov v19.16b, v16.16b
+ mov v20.16b, v16.16b
+ mov v21.16b, v16.16b
+ mov v22.16b, v16.16b
+ mov v23.16b, v16.16b
+ b 2f
+.endif
+1:
+ ld1 {v16.8h,v17.8h,v18.8h,v19.8h}, [x2], #64
+ ld1 {v20.8h,v21.8h,v22.8h,v23.8h}, [x2], #64
+ sub x2, x2, #128
+ st1 {v2.8h,v3.8h,v4.8h,v5.8h}, [x2], #64
+ st1 {v2.8h,v3.8h,v4.8h,v5.8h}, [x2], #64
+
+ \txfm1\()8
+
+ // Transpose 8x8 with 16 bit elements
+ transpose_8x8H v16, v17, v18, v19, v20, v21, v22, v23, v24, v25
+
+ \txfm2\()8
+2:
+ mov x3, x0
+ // Add into the destination
+ ld1 {v0.8b}, [x0], x1
+ srshr v16.8h, v16.8h, #5
+ ld1 {v1.8b}, [x0], x1
+ srshr v17.8h, v17.8h, #5
+ ld1 {v2.8b}, [x0], x1
+ srshr v18.8h, v18.8h, #5
+ uaddw v16.8h, v16.8h, v0.8b
+ ld1 {v3.8b}, [x0], x1
+ srshr v19.8h, v19.8h, #5
+ uaddw v17.8h, v17.8h, v1.8b
+ ld1 {v4.8b}, [x0], x1
+ srshr v20.8h, v20.8h, #5
+ uaddw v18.8h, v18.8h, v2.8b
+ sqxtun v0.8b, v16.8h
+ ld1 {v5.8b}, [x0], x1
+ srshr v21.8h, v21.8h, #5
+ uaddw v19.8h, v19.8h, v3.8b
+ sqxtun v1.8b, v17.8h
+ ld1 {v6.8b}, [x0], x1
+ srshr v22.8h, v22.8h, #5
+ uaddw v20.8h, v20.8h, v4.8b
+ sqxtun v2.8b, v18.8h
+ ld1 {v7.8b}, [x0], x1
+ srshr v23.8h, v23.8h, #5
+ uaddw v21.8h, v21.8h, v5.8b
+ sqxtun v3.8b, v19.8h
+
+ st1 {v0.8b}, [x3], x1
+ uaddw v22.8h, v22.8h, v6.8b
+ st1 {v1.8b}, [x3], x1
+ sqxtun v4.8b, v20.8h
+ st1 {v2.8b}, [x3], x1
+ uaddw v23.8h, v23.8h, v7.8b
+ st1 {v3.8b}, [x3], x1
+ sqxtun v5.8b, v21.8h
+ st1 {v4.8b}, [x3], x1
+ sqxtun v6.8b, v22.8h
+ st1 {v5.8b}, [x3], x1
+ sqxtun v7.8b, v23.8h
+
+ st1 {v6.8b}, [x3], x1
+ st1 {v7.8b}, [x3], x1
+
+ ret
+endfunc
+.endm
+
+itxfm_func8x8 idct, idct
+itxfm_func8x8 iadst, idct
+itxfm_func8x8 idct, iadst
+itxfm_func8x8 iadst, iadst
+
+
+function idct16x16_dc_add_neon
+ movrel x4, idct_coeffs
+ ld1 {v0.4h}, [x4]
+
+ movi v1.4h, #0
+
+ ld1 {v2.h}[0], [x2]
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ dup v2.8h, v2.h[0]
+ st1 {v1.h}[0], [x2]
+
+ srshr v2.8h, v2.8h, #6
+
+ mov x3, x0
+ mov x4, #16
+1:
+ // Loop to add the constant from v2 into all 16x16 outputs
+ subs x4, x4, #2
+ ld1 {v3.16b}, [x0], x1
+ ld1 {v4.16b}, [x0], x1
+ uaddw v16.8h, v2.8h, v3.8b
+ uaddw2 v17.8h, v2.8h, v3.16b
+ uaddw v18.8h, v2.8h, v4.8b
+ uaddw2 v19.8h, v2.8h, v4.16b
+ sqxtun v3.8b, v16.8h
+ sqxtun2 v3.16b, v17.8h
+ sqxtun v4.8b, v18.8h
+ sqxtun2 v4.16b, v19.8h
+ st1 {v3.16b}, [x3], x1
+ st1 {v4.16b}, [x3], x1
+ b.ne 1b
+
+ ret
+endfunc
+
+.macro idct16_end
+ butterfly_8h v18, v7, v4, v7 // v18 = t0a, v7 = t7a
+ butterfly_8h v19, v22, v5, v22 // v19 = t1a, v22 = t6
+ butterfly_8h v4, v26, v20, v26 // v4 = t2a, v26 = t5
+ butterfly_8h v5, v6, v28, v6 // v5 = t3a, v6 = t4
+ butterfly_8h v20, v28, v16, v24 // v20 = t8a, v28 = t11a
+ butterfly_8h v24, v21, v23, v21 // v24 = t9, v21 = t10
+ butterfly_8h v23, v27, v25, v27 // v23 = t14, v27 = t13
+ butterfly_8h v25, v29, v29, v17 // v25 = t15a, v29 = t12a
+
+ dmbutterfly0 v2, v3, v27, v21, v2, v3, v16, v17, v30, v31 // v2 = t13a, v3 = t10a
+ dmbutterfly0 v28, v27, v29, v28, v21, v29, v16, v17, v30, v31 // v28 = t12, v27 = t11
+
+ butterfly_8h v16, v31, v18, v25 // v16 = out[0], v31 = out[15]
+ butterfly_8h v17, v30, v19, v23 // v17 = out[1], v30 = out[14]
+ butterfly_8h_r v25, v22, v22, v24 // v25 = out[9], v22 = out[6]
+ butterfly_8h v23, v24, v7, v20 // v23 = out[7], v24 = out[8]
+ butterfly_8h v18, v29, v4, v2 // v18 = out[2], v29 = out[13]
+ butterfly_8h v19, v28, v5, v28 // v19 = out[3], v28 = out[12]
+ butterfly_8h v20, v27, v6, v27 // v20 = out[4], v27 = out[11]
+ butterfly_8h v21, v26, v26, v3 // v21 = out[5], v26 = out[10]
+ ret
+.endm
+
+function idct16
+ dmbutterfly0 v16, v24, v16, v24, v2, v3, v4, v5, v6, v7 // v16 = t0a, v24 = t1a
+ dmbutterfly v20, v28, v0.h[2], v0.h[3], v2, v3, v4, v5 // v20 = t2a, v28 = t3a
+ dmbutterfly v18, v30, v0.h[4], v0.h[5], v2, v3, v4, v5 // v18 = t4a, v30 = t7a
+ dmbutterfly v26, v22, v0.h[6], v0.h[7], v2, v3, v4, v5 // v26 = t5a, v22 = t6a
+ dmbutterfly v17, v31, v1.h[0], v1.h[1], v2, v3, v4, v5 // v17 = t8a, v31 = t15a
+ dmbutterfly v25, v23, v1.h[2], v1.h[3], v2, v3, v4, v5 // v25 = t9a, v23 = t14a
+ dmbutterfly v21, v27, v1.h[4], v1.h[5], v2, v3, v4, v5 // v21 = t10a, v27 = t13a
+ dmbutterfly v29, v19, v1.h[6], v1.h[7], v2, v3, v4, v5 // v29 = t11a, v19 = t12a
+
+ butterfly_8h v4, v28, v16, v28 // v4 = t0, v28 = t3
+ butterfly_8h v5, v20, v24, v20 // v5 = t1, v20 = t2
+ butterfly_8h v6, v26, v18, v26 // v6 = t4, v26 = t5
+ butterfly_8h v7, v22, v30, v22 // v7 = t7, v22 = t6
+ butterfly_8h v16, v25, v17, v25 // v16 = t8, v25 = t9
+ butterfly_8h v24, v21, v29, v21 // v24 = t11, v21 = t10
+ butterfly_8h v17, v27, v19, v27 // v17 = t12, v27 = t13
+ butterfly_8h v29, v23, v31, v23 // v29 = t15, v23 = t14
+
+ dmbutterfly0 v22, v26, v22, v26, v2, v3, v18, v19, v30, v31 // v22 = t6a, v26 = t5a
+ dmbutterfly v23, v25, v0.h[2], v0.h[3], v18, v19, v30, v31 // v23 = t9a, v25 = t14a
+ dmbutterfly v27, v21, v0.h[2], v0.h[3], v18, v19, v30, v31, neg=1 // v27 = t13a, v21 = t10a
+ idct16_end
+endfunc
+
+function idct16_half
+ dmbutterfly0_h v16, v24, v16, v24, v2, v3, v4, v5, v6, v7 // v16 = t0a, v24 = t1a
+ dmbutterfly_h1 v20, v28, v0.h[2], v0.h[3], v2, v3, v4, v5 // v20 = t2a, v28 = t3a
+ dmbutterfly_h1 v18, v30, v0.h[4], v0.h[5], v2, v3, v4, v5 // v18 = t4a, v30 = t7a
+ dmbutterfly_h2 v26, v22, v0.h[6], v0.h[7], v2, v3, v4, v5 // v26 = t5a, v22 = t6a
+ dmbutterfly_h1 v17, v31, v1.h[0], v1.h[1], v2, v3, v4, v5 // v17 = t8a, v31 = t15a
+ dmbutterfly_h2 v25, v23, v1.h[2], v1.h[3], v2, v3, v4, v5 // v25 = t9a, v23 = t14a
+ dmbutterfly_h1 v21, v27, v1.h[4], v1.h[5], v2, v3, v4, v5 // v21 = t10a, v27 = t13a
+ dmbutterfly_h2 v29, v19, v1.h[6], v1.h[7], v2, v3, v4, v5 // v29 = t11a, v19 = t12a
+
+ butterfly_8h v4, v28, v16, v28 // v4 = t0, v28 = t3
+ butterfly_8h v5, v20, v24, v20 // v5 = t1, v20 = t2
+ butterfly_8h v6, v26, v18, v26 // v6 = t4, v26 = t5
+ butterfly_8h v7, v22, v30, v22 // v7 = t7, v22 = t6
+ butterfly_8h v16, v25, v17, v25 // v16 = t8, v25 = t9
+ butterfly_8h v24, v21, v29, v21 // v24 = t11, v21 = t10
+ butterfly_8h v17, v27, v19, v27 // v17 = t12, v27 = t13
+ butterfly_8h v29, v23, v31, v23 // v29 = t15, v23 = t14
+
+ dmbutterfly0 v22, v26, v22, v26, v2, v3, v18, v19, v30, v31 // v22 = t6a, v26 = t5a
+ dmbutterfly v23, v25, v0.h[2], v0.h[3], v18, v19, v30, v31 // v23 = t9a, v25 = t14a
+ dmbutterfly v27, v21, v0.h[2], v0.h[3], v18, v19, v30, v31, neg=1 // v27 = t13a, v21 = t10a
+ idct16_end
+endfunc
+
+function idct16_quarter
+ dsmull_h v24, v25, v19, v1.h[7]
+ dsmull_h v4, v5, v17, v1.h[0]
+ dsmull_h v7, v6, v18, v0.h[5]
+ dsmull_h v30, v31, v18, v0.h[4]
+ neg v24.4s, v24.4s
+ neg v25.4s, v25.4s
+ dsmull_h v29, v28, v17, v1.h[1]
+ dsmull_h v26, v27, v19, v1.h[6]
+ dsmull_h v22, v23, v16, v0.h[0]
+ drshrn_h v24, v24, v25, #14
+ drshrn_h v16, v4, v5, #14
+ drshrn_h v7, v7, v6, #14
+ drshrn_h v6, v30, v31, #14
+ drshrn_h v29, v29, v28, #14
+ drshrn_h v17, v26, v27, #14
+ drshrn_h v28, v22, v23, #14
+
+ dmbutterfly_l v20, v21, v22, v23, v17, v24, v0.h[2], v0.h[3]
+ dmbutterfly_l v18, v19, v30, v31, v29, v16, v0.h[2], v0.h[3]
+ neg v22.4s, v22.4s
+ neg v23.4s, v23.4s
+ drshrn_h v27, v20, v21, #14
+ drshrn_h v21, v22, v23, #14
+ drshrn_h v23, v18, v19, #14
+ drshrn_h v25, v30, v31, #14
+ mov v4.16b, v28.16b
+ mov v5.16b, v28.16b
+ dmbutterfly0 v22, v26, v7, v6, v18, v19, v30, v31
+ mov v20.16b, v28.16b
+ idct16_end
+endfunc
+
+function iadst16
+ ld1 {v0.8h,v1.8h}, [x11]
+
+ dmbutterfly_l v6, v7, v4, v5, v31, v16, v0.h[1], v0.h[0] // v6,v7 = t1, v4,v5 = t0
+ dmbutterfly_l v10, v11, v8, v9, v23, v24, v0.h[5], v0.h[4] // v10,v11 = t9, v8,v9 = t8
+ dbutterfly_n v31, v24, v6, v7, v10, v11, v12, v13, v10, v11 // v31 = t1a, v24 = t9a
+ dmbutterfly_l v14, v15, v12, v13, v29, v18, v0.h[3], v0.h[2] // v14,v15 = t3, v12,v13 = t2
+ dbutterfly_n v16, v23, v4, v5, v8, v9, v6, v7, v8, v9 // v16 = t0a, v23 = t8a
+
+ dmbutterfly_l v6, v7, v4, v5, v21, v26, v0.h[7], v0.h[6] // v6,v7 = t11, v4,v5 = t10
+ dbutterfly_n v29, v26, v14, v15, v6, v7, v8, v9, v6, v7 // v29 = t3a, v26 = t11a
+ dmbutterfly_l v10, v11, v8, v9, v27, v20, v1.h[1], v1.h[0] // v10,v11 = t5, v8,v9 = t4
+ dbutterfly_n v18, v21, v12, v13, v4, v5, v6, v7, v4, v5 // v18 = t2a, v21 = t10a
+
+ dmbutterfly_l v14, v15, v12, v13, v19, v28, v1.h[5], v1.h[4] // v14,v15 = t13, v12,v13 = t12
+ dbutterfly_n v20, v28, v10, v11, v14, v15, v4, v5, v14, v15 // v20 = t5a, v28 = t13a
+ dmbutterfly_l v6, v7, v4, v5, v25, v22, v1.h[3], v1.h[2] // v6,v7 = t7, v4,v5 = t6
+ dbutterfly_n v27, v19, v8, v9, v12, v13, v10, v11, v12, v13 // v27 = t4a, v19 = t12a
+
+ dmbutterfly_l v10, v11, v8, v9, v17, v30, v1.h[7], v1.h[6] // v10,v11 = t15, v8,v9 = t14
+ ld1 {v0.8h}, [x10]
+ dbutterfly_n v22, v30, v6, v7, v10, v11, v12, v13, v10, v11 // v22 = t7a, v30 = t15a
+ dmbutterfly_l v14, v15, v12, v13, v23, v24, v0.h[4], v0.h[5] // v14,v15 = t9, v12,v13 = t8
+ dbutterfly_n v25, v17, v4, v5, v8, v9, v6, v7, v8, v9 // v25 = t6a, v17 = t14a
+
+ dmbutterfly_l v4, v5, v6, v7, v28, v19, v0.h[5], v0.h[4] // v4,v5 = t12, v6,v7 = t13
+ dbutterfly_n v23, v19, v12, v13, v4, v5, v8, v9, v4, v5 // v23 = t8a, v19 = t12a
+ dmbutterfly_l v10, v11, v8, v9, v21, v26, v0.h[6], v0.h[7] // v10,v11 = t11, v8,v9 = t10
+ butterfly_8h_r v4, v27, v16, v27 // v4 = t4, v27 = t0
+ dbutterfly_n v24, v28, v14, v15, v6, v7, v12, v13, v6, v7 // v24 = t9a, v28 = t13a
+
+ dmbutterfly_l v12, v13, v14, v15, v30, v17, v0.h[7], v0.h[6] // v12,v13 = t14, v14,v15 = t15
+ butterfly_8h_r v5, v20, v31, v20 // v5 = t5, v20 = t1
+ dbutterfly_n v21, v17, v8, v9, v12, v13, v6, v7, v12, v13 // v21 = t10a, v17 = t14a
+ dbutterfly_n v26, v30, v10, v11, v14, v15, v8, v9, v14, v15 // v26 = t11a, v30 = t15a
+
+ butterfly_8h_r v6, v25, v18, v25 // v6 = t6, v25 = t2
+ butterfly_8h_r v7, v22, v29, v22 // v7 = t7, v22 = t3
+
+ dmbutterfly_l v10, v11, v8, v9, v19, v28, v0.h[2], v0.h[3] // v10,v11 = t13, v8,v9 = t12
+ dmbutterfly_l v12, v13, v14, v15, v30, v17, v0.h[3], v0.h[2] // v12,v13 = t14, v14,v15 = t15
+
+ dbutterfly_n v18, v30, v8, v9, v12, v13, v16, v17, v12, v13 // v18 = out[2], v30 = t14a
+ dbutterfly_n v29, v17, v10, v11, v14, v15, v12, v13, v14, v15 // v29 = -out[13], v17 = t15a
+ neg v29.8h, v29.8h // v29 = out[13]
+
+ dmbutterfly_l v10, v11, v8, v9, v4, v5, v0.h[2], v0.h[3] // v10,v11 = t5a, v8,v9 = t4a
+ dmbutterfly_l v12, v13, v14, v15, v7, v6, v0.h[3], v0.h[2] // v12,v13 = t6a, v14,v15 = t7a
+
+ butterfly_8h v2, v6, v27, v25 // v2 = out[0], v6 = t2a
+ butterfly_8h v3, v7, v23, v21 // v3 =-out[1], v7 = t10
+
+ dbutterfly_n v19, v31, v8, v9, v12, v13, v4, v5, v8, v9 // v19 = -out[3], v31 = t6
+ neg v19.8h, v19.8h // v19 = out[3]
+ dbutterfly_n v28, v16, v10, v11, v14, v15, v4, v5, v10, v11 // v28 = out[12], v16 = t7
+
+ butterfly_8h v5, v8, v20, v22 // v5 =-out[15],v8 = t3a
+ butterfly_8h v4, v9, v24, v26 // v4 = out[14],v9 = t11
+
+ dmbutterfly0 v23, v24, v6, v8, v10, v11, v12, v13, v14, v15, 1 // v23 = out[7], v24 = out[8]
+ dmbutterfly0 v21, v26, v30, v17, v10, v11, v12, v13, v14, v15, 1 // v21 = out[5], v26 = out[10]
+ dmbutterfly0 v20, v27, v16, v31, v10, v11, v12, v13, v14, v15 // v20 = out[4], v27 = out[11]
+ dmbutterfly0 v22, v25, v9, v7, v10, v11, v12, v13, v14, v15 // v22 = out[6], v25 = out[9]
+
+ neg v31.8h, v5.8h // v31 = out[15]
+ neg v17.8h, v3.8h // v17 = out[1]
+
+ mov v16.16b, v2.16b
+ mov v30.16b, v4.16b
+ ret
+endfunc
+
+// Helper macros; we can't use these expressions directly within
+// e.g. .irp due to the extra concatenation \(). Therefore wrap
+// them in macros to allow using .irp below.
+.macro load i, src, inc
+ ld1 {v\i\().8h}, [\src], \inc
+.endm
+.macro store i, dst, inc
+ st1 {v\i\().8h}, [\dst], \inc
+.endm
+.macro movi_v i, size, imm
+ movi v\i\()\size, \imm
+.endm
+.macro load_clear i, src, inc
+ ld1 {v\i\().8h}, [\src]
+ st1 {v2.8h}, [\src], \inc
+.endm
+
+.macro load_add_store coef0, coef1, coef2, coef3, coef4, coef5, coef6, coef7, tmp1, tmp2
+ srshr \coef0, \coef0, #6
+ ld1 {v2.8b}, [x0], x1
+ srshr \coef1, \coef1, #6
+ ld1 {v3.8b}, [x3], x1
+ srshr \coef2, \coef2, #6
+ ld1 {v4.8b}, [x0], x1
+ srshr \coef3, \coef3, #6
+ uaddw \coef0, \coef0, v2.8b
+ ld1 {v5.8b}, [x3], x1
+ uaddw \coef1, \coef1, v3.8b
+ srshr \coef4, \coef4, #6
+ ld1 {v6.8b}, [x0], x1
+ srshr \coef5, \coef5, #6
+ ld1 {v7.8b}, [x3], x1
+ sqxtun v2.8b, \coef0
+ srshr \coef6, \coef6, #6
+ sqxtun v3.8b, \coef1
+ srshr \coef7, \coef7, #6
+ uaddw \coef2, \coef2, v4.8b
+ ld1 {\tmp1}, [x0], x1
+ uaddw \coef3, \coef3, v5.8b
+ ld1 {\tmp2}, [x3], x1
+ sqxtun v4.8b, \coef2
+ sub x0, x0, x1, lsl #2
+ sub x3, x3, x1, lsl #2
+ sqxtun v5.8b, \coef3
+ uaddw \coef4, \coef4, v6.8b
+ st1 {v2.8b}, [x0], x1
+ uaddw \coef5, \coef5, v7.8b
+ st1 {v3.8b}, [x3], x1
+ sqxtun v6.8b, \coef4
+ st1 {v4.8b}, [x0], x1
+ sqxtun v7.8b, \coef5
+ st1 {v5.8b}, [x3], x1
+ uaddw \coef6, \coef6, \tmp1
+ st1 {v6.8b}, [x0], x1
+ uaddw \coef7, \coef7, \tmp2
+ st1 {v7.8b}, [x3], x1
+ sqxtun \tmp1, \coef6
+ sqxtun \tmp2, \coef7
+ st1 {\tmp1}, [x0], x1
+ st1 {\tmp2}, [x3], x1
+.endm
+
+// Read a vertical 8x16 slice out of a 16x16 matrix, do a transform on it,
+// transpose into a horizontal 16x8 slice and store.
+// x0 = dst (temp buffer)
+// x1 = slice offset
+// x2 = src
+// x9 = input stride
+.macro itxfm16_1d_funcs txfm
+function \txfm\()16_1d_8x16_pass1_neon
+ mov x14, x30
+
+ movi v2.8h, #0
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
+ load_clear \i, x2, x9
+.endr
+
+ bl \txfm\()16
+
+ // Do two 8x8 transposes. Originally, v16-v31 contain the
+ // 16 rows. Afterwards, v16-v23 and v24-v31 contain the two
+ // transposed 8x8 blocks.
+ transpose_8x8H v16, v17, v18, v19, v20, v21, v22, v23, v2, v3
+ transpose_8x8H v24, v25, v26, v27, v28, v29, v30, v31, v2, v3
+
+ // Store the transposed 8x8 blocks horizontally.
+ cmp x1, #8
+ b.eq 1f
+.irp i, 16, 24, 17, 25, 18, 26, 19, 27, 20, 28, 21, 29, 22, 30, 23, 31
+ store \i, x0, #16
+.endr
+ br x14
+1:
+ // Special case: For the last input column (x1 == 8),
+ // which would be stored as the last row in the temp buffer,
+ // don't store the first 8x8 block, but keep it in registers
+ // for the first slice of the second pass (where it is the
+ // last 8x8 block).
+.irp i, 24, 25, 26, 27, 28, 29, 30, 31
+ add x0, x0, #16
+ store \i, x0, #16
+.endr
+ mov v24.16b, v16.16b
+ mov v25.16b, v17.16b
+ mov v26.16b, v18.16b
+ mov v27.16b, v19.16b
+ mov v28.16b, v20.16b
+ mov v29.16b, v21.16b
+ mov v30.16b, v22.16b
+ mov v31.16b, v23.16b
+ br x14
+endfunc
+
+// Read a vertical 8x16 slice out of a 16x16 matrix, do a transform on it,
+// load the destination pixels (from a similar 8x16 slice), add and store back.
+// x0 = dst
+// x1 = dst stride
+// x2 = src (temp buffer)
+// x3 = slice offset
+// x9 = temp buffer stride
+function \txfm\()16_1d_8x16_pass2_neon
+ mov x14, x30
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23
+ load \i, x2, x9
+.endr
+ cbz x3, 1f
+.irp i, 24, 25, 26, 27, 28, 29, 30, 31
+ load \i, x2, x9
+.endr
+1:
+
+ add x3, x0, x1
+ lsl x1, x1, #1
+ bl \txfm\()16
+
+ load_add_store v16.8h, v17.8h, v18.8h, v19.8h, v20.8h, v21.8h, v22.8h, v23.8h, v16.8b, v17.8b
+ load_add_store v24.8h, v25.8h, v26.8h, v27.8h, v28.8h, v29.8h, v30.8h, v31.8h, v16.8b, v17.8b
+
+ br x14
+endfunc
+.endm
+
+itxfm16_1d_funcs idct
+itxfm16_1d_funcs iadst
+
+.macro itxfm_func16x16 txfm1, txfm2
+function ff_vp9_\txfm1\()_\txfm2\()_16x16_add_neon, export=1
+.ifc \txfm1\()_\txfm2,idct_idct
+ cmp w3, #1
+ b.eq idct16x16_dc_add_neon
+.endif
+ mov x15, x30
+ // iadst16 requires clobbering v8-v15, but idct16 doesn't need to.
+.ifnc \txfm1\()_\txfm2,idct_idct
+ stp d14, d15, [sp, #-0x10]!
+ stp d12, d13, [sp, #-0x10]!
+ stp d10, d11, [sp, #-0x10]!
+ stp d8, d9, [sp, #-0x10]!
+.endif
+
+ sub sp, sp, #512
+
+ mov x4, x0
+ mov x5, x1
+ mov x6, x2
+
+ movrel x10, idct_coeffs
+.ifnc \txfm1\()_\txfm2,idct_idct
+ movrel x11, iadst16_coeffs
+.endif
+.ifc \txfm1,idct
+ ld1 {v0.8h,v1.8h}, [x10]
+.endif
+ mov x9, #32
+
+.ifc \txfm1\()_\txfm2,idct_idct
+ cmp w3, #10
+ b.le idct16x16_quarter_add_neon
+ cmp w3, #38
+ b.le idct16x16_half_add_neon
+.endif
+
+.irp i, 0, 8
+ add x0, sp, #(\i*32)
+.ifc \txfm1\()_\txfm2,idct_idct
+.if \i == 8
+ cmp w3, #38
+ b.le 1f
+.endif
+.endif
+ mov x1, #\i
+ add x2, x6, #(\i*2)
+ bl \txfm1\()16_1d_8x16_pass1_neon
+.endr
+.ifc \txfm1\()_\txfm2,iadst_idct
+ ld1 {v0.8h,v1.8h}, [x10]
+.endif
+
+.ifc \txfm1\()_\txfm2,idct_idct
+ b 3f
+1:
+ // Set v24-v31 to zero, for the in-register passthrough of
+ // coefficients to pass 2. Since we only do two slices, this can
+ // only ever happen for the second slice. So we only need to store
+ // zeros to the temp buffer for the second half of the buffer.
+ // Move x0 to the second half, and use x9 == 32 as increment.
+ add x0, x0, #16
+.irp i, 24, 25, 26, 27, 28, 29, 30, 31
+ movi_v \i, .16b, #0
+ st1 {v24.8h}, [x0], x9
+.endr
+3:
+.endif
+
+.irp i, 0, 8
+ add x0, x4, #(\i)
+ mov x1, x5
+ add x2, sp, #(\i*2)
+ mov x3, #\i
+ bl \txfm2\()16_1d_8x16_pass2_neon
+.endr
+
+ add sp, sp, #512
+.ifnc \txfm1\()_\txfm2,idct_idct
+ ldp d8, d9, [sp], 0x10
+ ldp d10, d11, [sp], 0x10
+ ldp d12, d13, [sp], 0x10
+ ldp d14, d15, [sp], 0x10
+.endif
+ br x15
+endfunc
+.endm
+
+itxfm_func16x16 idct, idct
+itxfm_func16x16 iadst, idct
+itxfm_func16x16 idct, iadst
+itxfm_func16x16 iadst, iadst
+
+function idct16_1d_8x16_pass1_quarter_neon
+ mov x14, x30
+ movi v2.8h, #0
+.irp i, 16, 17, 18, 19
+ load_clear \i, x2, x9
+.endr
+
+ bl idct16_quarter
+
+ // Do two 8x8 transposes. Originally, v16-v31 contain the
+ // 16 rows. Afterwards, v16-v23 and v24-v31 contain the two
+ // transposed 8x8 blocks.
+ transpose_8x8H v16, v17, v18, v19, v20, v21, v22, v23, v2, v3
+ transpose_8x8H v24, v25, v26, v27, v28, v29, v30, v31, v2, v3
+
+ // Store the transposed 8x8 blocks horizontally.
+ // The first 8x8 block is kept in registers for the second pass,
+ // store the rest in the temp buffer.
+ // Since only a 4x4 part of the input was nonzero, this means that
+ // only 4 rows are nonzero after transposing, and the second pass
+ // only reads the topmost 4 rows. Therefore only store the topmost
+ // 4 rows.
+ add x0, x0, #16
+.irp i, 24, 25, 26, 27
+ store \i, x0, x9
+.endr
+ br x14
+endfunc
+
+function idct16_1d_8x16_pass2_quarter_neon
+ mov x14, x30
+ cbz x3, 1f
+.irp i, 16, 17, 18, 19
+ load \i, x2, x9
+.endr
+1:
+
+ add x3, x0, x1
+ lsl x1, x1, #1
+ bl idct16_quarter
+
+ load_add_store v16.8h, v17.8h, v18.8h, v19.8h, v20.8h, v21.8h, v22.8h, v23.8h, v16.8b, v17.8b
+ load_add_store v24.8h, v25.8h, v26.8h, v27.8h, v28.8h, v29.8h, v30.8h, v31.8h, v16.8b, v17.8b
+
+ br x14
+endfunc
+
+function idct16_1d_8x16_pass1_half_neon
+ mov x14, x30
+ movi v2.8h, #0
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23
+ load_clear \i, x2, x9
+.endr
+
+ bl idct16_half
+
+ // Do two 8x8 transposes. Originally, v16-v31 contain the
+ // 16 rows. Afterwards, v16-v23 and v24-v31 contain the two
+ // transposed 8x8 blocks.
+ transpose_8x8H v16, v17, v18, v19, v20, v21, v22, v23, v2, v3
+ transpose_8x8H v24, v25, v26, v27, v28, v29, v30, v31, v2, v3
+
+ // Store the transposed 8x8 blocks horizontally.
+ // The first 8x8 block is kept in registers for the second pass,
+ // store the rest in the temp buffer.
+ add x0, x0, #16
+.irp i, 24, 25, 26, 27, 28, 29, 30, 31
+ store \i, x0, x9
+.endr
+ br x14
+endfunc
+
+function idct16_1d_8x16_pass2_half_neon
+ mov x14, x30
+ cbz x3, 1f
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23
+ load \i, x2, x9
+.endr
+1:
+
+ add x3, x0, x1
+ lsl x1, x1, #1
+ bl idct16_half
+
+ load_add_store v16.8h, v17.8h, v18.8h, v19.8h, v20.8h, v21.8h, v22.8h, v23.8h, v16.8b, v17.8b
+ load_add_store v24.8h, v25.8h, v26.8h, v27.8h, v28.8h, v29.8h, v30.8h, v31.8h, v16.8b, v17.8b
+
+ br x14
+endfunc
+
+.macro idct16_partial size
+function idct16x16_\size\()_add_neon
+ add x0, sp, #(0*32)
+ add x2, x6, #(0*2)
+ bl idct16_1d_8x16_pass1_\size\()_neon
+.irp i, 0, 8
+ add x0, x4, #(\i)
+ mov x1, x5
+ add x2, sp, #(\i*2)
+ mov x3, #\i
+ bl idct16_1d_8x16_pass2_\size\()_neon
+.endr
+
+ add sp, sp, #512
+ br x15
+endfunc
+.endm
+
+idct16_partial quarter
+idct16_partial half
+
+function idct32x32_dc_add_neon
+ movrel x4, idct_coeffs
+ ld1 {v0.4h}, [x4]
+
+ movi v1.4h, #0
+
+ ld1 {v2.h}[0], [x2]
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ smull v2.4s, v2.4h, v0.h[0]
+ rshrn v2.4h, v2.4s, #14
+ dup v2.8h, v2.h[0]
+ st1 {v1.h}[0], [x2]
+
+ srshr v0.8h, v2.8h, #6
+
+ mov x3, x0
+ mov x4, #32
+1:
+ // Loop to add the constant v0 into all 32x32 outputs
+ subs x4, x4, #2
+ ld1 {v1.16b,v2.16b}, [x0], x1
+ uaddw v16.8h, v0.8h, v1.8b
+ uaddw2 v17.8h, v0.8h, v1.16b
+ ld1 {v3.16b,v4.16b}, [x0], x1
+ uaddw v18.8h, v0.8h, v2.8b
+ uaddw2 v19.8h, v0.8h, v2.16b
+ uaddw v20.8h, v0.8h, v3.8b
+ uaddw2 v21.8h, v0.8h, v3.16b
+ uaddw v22.8h, v0.8h, v4.8b
+ uaddw2 v23.8h, v0.8h, v4.16b
+ sqxtun v1.8b, v16.8h
+ sqxtun2 v1.16b, v17.8h
+ sqxtun v2.8b, v18.8h
+ sqxtun2 v2.16b, v19.8h
+ sqxtun v3.8b, v20.8h
+ sqxtun2 v3.16b, v21.8h
+ st1 {v1.16b,v2.16b}, [x3], x1
+ sqxtun v4.8b, v22.8h
+ sqxtun2 v4.16b, v23.8h
+ st1 {v3.16b,v4.16b}, [x3], x1
+ b.ne 1b
+
+ ret
+endfunc
+
+.macro idct32_end
+ butterfly_8h v16, v5, v4, v5 // v16 = t16a, v5 = t19a
+ butterfly_8h v17, v20, v23, v20 // v17 = t17, v20 = t18
+ butterfly_8h v18, v6, v7, v6 // v18 = t23a, v6 = t20a
+ butterfly_8h v19, v21, v22, v21 // v19 = t22, v21 = t21
+ butterfly_8h v4, v28, v28, v30 // v4 = t24a, v28 = t27a
+ butterfly_8h v23, v26, v25, v26 // v23 = t25, v26 = t26
+ butterfly_8h v7, v3, v29, v31 // v7 = t31a, v3 = t28a
+ butterfly_8h v22, v27, v24, v27 // v22 = t30, v27 = t29
+
+ dmbutterfly v27, v20, v0.h[2], v0.h[3], v24, v25, v30, v31 // v27 = t18a, v20 = t29a
+ dmbutterfly v3, v5, v0.h[2], v0.h[3], v24, v25, v30, v31 // v3 = t19, v5 = t28
+ dmbutterfly v28, v6, v0.h[2], v0.h[3], v24, v25, v30, v31, neg=1 // v28 = t27, v6 = t20
+ dmbutterfly v26, v21, v0.h[2], v0.h[3], v24, v25, v30, v31, neg=1 // v26 = t26a, v21 = t21a
+
+ butterfly_8h v31, v24, v7, v4 // v31 = t31, v24 = t24
+ butterfly_8h v30, v25, v22, v23 // v30 = t30a, v25 = t25a
+ butterfly_8h_r v23, v16, v16, v18 // v23 = t23, v16 = t16
+ butterfly_8h_r v22, v17, v17, v19 // v22 = t22a, v17 = t17a
+ butterfly_8h v18, v21, v27, v21 // v18 = t18, v21 = t21
+ butterfly_8h_r v27, v28, v5, v28 // v27 = t27a, v28 = t28a
+ butterfly_8h v29, v26, v20, v26 // v29 = t29, v26 = t26
+ butterfly_8h v19, v20, v3, v6 // v19 = t19a, v20 = t20
+
+ dmbutterfly0 v27, v20, v27, v20, v2, v3, v4, v5, v6, v7 // v27 = t27, v20 = t20
+ dmbutterfly0 v26, v21, v26, v21, v2, v3, v4, v5, v6, v7 // v26 = t26a, v21 = t21a
+ dmbutterfly0 v25, v22, v25, v22, v2, v3, v4, v5, v6, v7 // v25 = t25, v22 = t22
+ dmbutterfly0 v24, v23, v24, v23, v2, v3, v4, v5, v6, v7 // v24 = t24a, v23 = t23a
+ ret
+.endm
+
+function idct32_odd
+ dmbutterfly v16, v31, v8.h[0], v8.h[1], v4, v5, v6, v7 // v16 = t16a, v31 = t31a
+ dmbutterfly v24, v23, v8.h[2], v8.h[3], v4, v5, v6, v7 // v24 = t17a, v23 = t30a
+ dmbutterfly v20, v27, v8.h[4], v8.h[5], v4, v5, v6, v7 // v20 = t18a, v27 = t29a
+ dmbutterfly v28, v19, v8.h[6], v8.h[7], v4, v5, v6, v7 // v28 = t19a, v19 = t28a
+ dmbutterfly v18, v29, v9.h[0], v9.h[1], v4, v5, v6, v7 // v18 = t20a, v29 = t27a
+ dmbutterfly v26, v21, v9.h[2], v9.h[3], v4, v5, v6, v7 // v26 = t21a, v21 = t26a
+ dmbutterfly v22, v25, v9.h[4], v9.h[5], v4, v5, v6, v7 // v22 = t22a, v25 = t25a
+ dmbutterfly v30, v17, v9.h[6], v9.h[7], v4, v5, v6, v7 // v30 = t23a, v17 = t24a
+
+ butterfly_8h v4, v24, v16, v24 // v4 = t16, v24 = t17
+ butterfly_8h v5, v20, v28, v20 // v5 = t19, v20 = t18
+ butterfly_8h v6, v26, v18, v26 // v6 = t20, v26 = t21
+ butterfly_8h v7, v22, v30, v22 // v7 = t23, v22 = t22
+ butterfly_8h v28, v25, v17, v25 // v28 = t24, v25 = t25
+ butterfly_8h v30, v21, v29, v21 // v30 = t27, v21 = t26
+ butterfly_8h v29, v23, v31, v23 // v29 = t31, v23 = t30
+ butterfly_8h v31, v27, v19, v27 // v31 = t28, v27 = t29
+
+ dmbutterfly v23, v24, v0.h[4], v0.h[5], v16, v17, v18, v19 // v23 = t17a, v24 = t30a
+ dmbutterfly v27, v20, v0.h[4], v0.h[5], v16, v17, v18, v19, neg=1 // v27 = t29a, v20 = t18a
+ dmbutterfly v21, v26, v0.h[6], v0.h[7], v16, v17, v18, v19 // v21 = t21a, v26 = t26a
+ dmbutterfly v25, v22, v0.h[6], v0.h[7], v16, v17, v18, v19, neg=1 // v25 = t25a, v22 = t22a
+ idct32_end
+endfunc
+
+function idct32_odd_half
+ dmbutterfly_h1 v16, v31, v8.h[0], v8.h[1], v4, v5, v6, v7 // v16 = t16a, v31 = t31a
+ dmbutterfly_h2 v24, v23, v8.h[2], v8.h[3], v4, v5, v6, v7 // v24 = t17a, v23 = t30a
+ dmbutterfly_h1 v20, v27, v8.h[4], v8.h[5], v4, v5, v6, v7 // v20 = t18a, v27 = t29a
+ dmbutterfly_h2 v28, v19, v8.h[6], v8.h[7], v4, v5, v6, v7 // v28 = t19a, v19 = t28a
+ dmbutterfly_h1 v18, v29, v9.h[0], v9.h[1], v4, v5, v6, v7 // v18 = t20a, v29 = t27a
+ dmbutterfly_h2 v26, v21, v9.h[2], v9.h[3], v4, v5, v6, v7 // v26 = t21a, v21 = t26a
+ dmbutterfly_h1 v22, v25, v9.h[4], v9.h[5], v4, v5, v6, v7 // v22 = t22a, v25 = t25a
+ dmbutterfly_h2 v30, v17, v9.h[6], v9.h[7], v4, v5, v6, v7 // v30 = t23a, v17 = t24a
+
+ butterfly_8h v4, v24, v16, v24 // v4 = t16, v24 = t17
+ butterfly_8h v5, v20, v28, v20 // v5 = t19, v20 = t18
+ butterfly_8h v6, v26, v18, v26 // v6 = t20, v26 = t21
+ butterfly_8h v7, v22, v30, v22 // v7 = t23, v22 = t22
+ butterfly_8h v28, v25, v17, v25 // v28 = t24, v25 = t25
+ butterfly_8h v30, v21, v29, v21 // v30 = t27, v21 = t26
+ butterfly_8h v29, v23, v31, v23 // v29 = t31, v23 = t30
+ butterfly_8h v31, v27, v19, v27 // v31 = t28, v27 = t29
+
+ dmbutterfly v23, v24, v0.h[4], v0.h[5], v16, v17, v18, v19 // v23 = t17a, v24 = t30a
+ dmbutterfly v27, v20, v0.h[4], v0.h[5], v16, v17, v18, v19, neg=1 // v27 = t29a, v20 = t18a
+ dmbutterfly v21, v26, v0.h[6], v0.h[7], v16, v17, v18, v19 // v21 = t21a, v26 = t26a
+ dmbutterfly v25, v22, v0.h[6], v0.h[7], v16, v17, v18, v19, neg=1 // v25 = t25a, v22 = t22a
+ idct32_end
+endfunc
+
+function idct32_odd_quarter
+ dsmull_h v4, v5, v16, v8.h[0]
+ dsmull_h v28, v29, v19, v8.h[7]
+ dsmull_h v30, v31, v16, v8.h[1]
+ dsmull_h v22, v23, v17, v9.h[6]
+ dsmull_h v7, v6, v17, v9.h[7]
+ dsmull_h v26, v27, v19, v8.h[6]
+ dsmull_h v20, v21, v18, v9.h[0]
+ dsmull_h v24, v25, v18, v9.h[1]
+
+ neg v28.4s, v28.4s
+ neg v29.4s, v29.4s
+ neg v7.4s, v7.4s
+ neg v6.4s, v6.4s
+
+ drshrn_h v4, v4, v5, #14
+ drshrn_h v5, v28, v29, #14
+ drshrn_h v29, v30, v31, #14
+ drshrn_h v28, v22, v23, #14
+ drshrn_h v7, v7, v6, #14
+ drshrn_h v31, v26, v27, #14
+ drshrn_h v6, v20, v21, #14
+ drshrn_h v30, v24, v25, #14
+
+ dmbutterfly_l v16, v17, v18, v19, v29, v4, v0.h[4], v0.h[5]
+ dmbutterfly_l v27, v26, v20, v21, v31, v5, v0.h[4], v0.h[5]
+ drshrn_h v23, v16, v17, #14
+ drshrn_h v24, v18, v19, #14
+ neg v20.4s, v20.4s
+ neg v21.4s, v21.4s
+ drshrn_h v27, v27, v26, #14
+ drshrn_h v20, v20, v21, #14
+ dmbutterfly_l v16, v17, v18, v19, v30, v6, v0.h[6], v0.h[7]
+ drshrn_h v21, v16, v17, #14
+ drshrn_h v26, v18, v19, #14
+ dmbutterfly_l v16, v17, v18, v19, v28, v7, v0.h[6], v0.h[7]
+ drshrn_h v25, v16, v17, #14
+ neg v18.4s, v18.4s
+ neg v19.4s, v19.4s
+ drshrn_h v22, v18, v19, #14
+
+ idct32_end
+endfunc
+
+.macro idct32_funcs suffix
+// Do an 32-point IDCT of a 8x32 slice out of a 32x32 matrix.
+// The 32-point IDCT can be decomposed into two 16-point IDCTs;
+// a normal IDCT16 with every other input component (the even ones, with
+// each output written twice), followed by a separate 16-point IDCT
+// of the odd inputs, added/subtracted onto the outputs of the first idct16.
+// x0 = dst (temp buffer)
+// x1 = unused
+// x2 = src
+// x9 = double input stride
+function idct32_1d_8x32_pass1\suffix\()_neon
+ mov x14, x30
+ movi v2.8h, #0
+
+ // v16 = IN(0), v17 = IN(2) ... v31 = IN(30)
+.ifb \suffix
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
+ load_clear \i, x2, x9
+.endr
+.endif
+.ifc \suffix,_quarter
+.irp i, 16, 17, 18, 19
+ load_clear \i, x2, x9
+.endr
+.endif
+.ifc \suffix,_half
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23
+ load_clear \i, x2, x9
+.endr
+.endif
+
+ bl idct16\suffix
+
+ // Do two 8x8 transposes. Originally, v16-v31 contain the
+ // 16 rows. Afterwards, v16-v23 and v24-v31 contain the
+ // two transposed 8x8 blocks.
+ transpose_8x8H v16, v17, v18, v19, v20, v21, v22, v23, v2, v3
+ transpose_8x8H v24, v25, v26, v27, v28, v29, v30, v31, v2, v3
+
+ // Store the registers a, b horizontally, followed by the
+ // same registers b, a mirrored.
+.macro store_rev a, b
+ // There's no rev128 instruction, but we reverse each 64 bit
+ // half, and then flip them using an ext with 8 bytes offset.
+ rev64 v3.8h, \b
+ st1 {\a}, [x0], #16
+ rev64 v2.8h, \a
+ ext v3.16b, v3.16b, v3.16b, #8
+ st1 {\b}, [x0], #16
+ ext v2.16b, v2.16b, v2.16b, #8
+ st1 {v3.8h}, [x0], #16
+ st1 {v2.8h}, [x0], #16
+.endm
+ store_rev v16.8h, v24.8h
+ store_rev v17.8h, v25.8h
+ store_rev v18.8h, v26.8h
+ store_rev v19.8h, v27.8h
+ store_rev v20.8h, v28.8h
+ store_rev v21.8h, v29.8h
+ store_rev v22.8h, v30.8h
+ store_rev v23.8h, v31.8h
+ sub x0, x0, #512
+.purgem store_rev
+
+ // Move x2 back to the start of the input, and move
+ // to the first odd row
+.ifb \suffix
+ sub x2, x2, x9, lsl #4
+.endif
+.ifc \suffix,_quarter
+ sub x2, x2, x9, lsl #2
+.endif
+.ifc \suffix,_half
+ sub x2, x2, x9, lsl #3
+.endif
+ add x2, x2, #64
+
+ movi v2.8h, #0
+ // v16 = IN(1), v17 = IN(3) ... v31 = IN(31)
+.ifb \suffix
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
+ load_clear \i, x2, x9
+.endr
+.endif
+.ifc \suffix,_quarter
+.irp i, 16, 17, 18, 19
+ load_clear \i, x2, x9
+.endr
+.endif
+.ifc \suffix,_half
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23
+ load_clear \i, x2, x9
+.endr
+.endif
+
+ bl idct32_odd\suffix
+
+ transpose_8x8H v31, v30, v29, v28, v27, v26, v25, v24, v2, v3
+ transpose_8x8H v23, v22, v21, v20, v19, v18, v17, v16, v2, v3
+
+ // Store the registers a, b horizontally,
+ // adding into the output first, and the mirrored,
+ // subtracted from the output.
+.macro store_rev a, b
+ ld1 {v4.8h}, [x0]
+ rev64 v3.8h, \b
+ add v4.8h, v4.8h, \a
+ rev64 v2.8h, \a
+ st1 {v4.8h}, [x0], #16
+ ext v3.16b, v3.16b, v3.16b, #8
+ ld1 {v5.8h}, [x0]
+ ext v2.16b, v2.16b, v2.16b, #8
+ add v5.8h, v5.8h, \b
+ st1 {v5.8h}, [x0], #16
+ ld1 {v6.8h}, [x0]
+ sub v6.8h, v6.8h, v3.8h
+ st1 {v6.8h}, [x0], #16
+ ld1 {v7.8h}, [x0]
+ sub v7.8h, v7.8h, v2.8h
+ st1 {v7.8h}, [x0], #16
+.endm
+
+ store_rev v31.8h, v23.8h
+ store_rev v30.8h, v22.8h
+ store_rev v29.8h, v21.8h
+ store_rev v28.8h, v20.8h
+ store_rev v27.8h, v19.8h
+ store_rev v26.8h, v18.8h
+ store_rev v25.8h, v17.8h
+ store_rev v24.8h, v16.8h
+.purgem store_rev
+ br x14
+endfunc
+
+// This is mostly the same as 8x32_pass1, but without the transpose,
+// and use the source as temp buffer between the two idct passes, and
+// add into the destination.
+// x0 = dst
+// x1 = dst stride
+// x2 = src (temp buffer)
+// x7 = negative double temp buffer stride
+// x9 = double temp buffer stride
+function idct32_1d_8x32_pass2\suffix\()_neon
+ mov x14, x30
+ // v16 = IN(0), v17 = IN(2) ... v31 = IN(30)
+.ifb \suffix
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
+ load \i, x2, x9
+.endr
+ sub x2, x2, x9, lsl #4
+.endif
+.ifc \suffix,_quarter
+.irp i, 16, 17, 18, 19
+ load \i, x2, x9
+.endr
+ sub x2, x2, x9, lsl #2
+.endif
+.ifc \suffix,_half
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23
+ load \i, x2, x9
+.endr
+ sub x2, x2, x9, lsl #3
+.endif
+
+ bl idct16\suffix
+
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
+ store \i, x2, x9
+.endr
+
+ sub x2, x2, x9, lsl #4
+ add x2, x2, #64
+
+ // v16 = IN(1), v17 = IN(3) ... v31 = IN(31)
+.ifb \suffix
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
+ load \i, x2, x9
+.endr
+ sub x2, x2, x9, lsl #4
+.endif
+.ifc \suffix,_quarter
+.irp i, 16, 17, 18, 19
+ load \i, x2, x9
+.endr
+ sub x2, x2, x9, lsl #2
+.endif
+.ifc \suffix,_half
+.irp i, 16, 17, 18, 19, 20, 21, 22, 23
+ load \i, x2, x9
+.endr
+ sub x2, x2, x9, lsl #3
+.endif
+ sub x2, x2, #64
+
+ bl idct32_odd\suffix
+
+.macro load_acc_store a, b, c, d, neg=0
+.if \neg == 0
+ ld1 {v4.8h}, [x2], x9
+ ld1 {v5.8h}, [x2], x9
+ add v4.8h, v4.8h, \a
+ ld1 {v6.8h}, [x2], x9
+ add v5.8h, v5.8h, \b
+ ld1 {v7.8h}, [x2], x9
+ add v6.8h, v6.8h, \c
+ add v7.8h, v7.8h, \d
+.else
+ ld1 {v4.8h}, [x2], x7
+ ld1 {v5.8h}, [x2], x7
+ sub v4.8h, v4.8h, \a
+ ld1 {v6.8h}, [x2], x7
+ sub v5.8h, v5.8h, \b
+ ld1 {v7.8h}, [x2], x7
+ sub v6.8h, v6.8h, \c
+ sub v7.8h, v7.8h, \d
+.endif
+ ld1 {v10.8b}, [x0], x1
+ ld1 {v11.8b}, [x0], x1
+ srshr v4.8h, v4.8h, #6
+ ld1 {v2.8b}, [x0], x1
+ srshr v5.8h, v5.8h, #6
+ uaddw v4.8h, v4.8h, v10.8b
+ ld1 {v3.8b}, [x0], x1
+ srshr v6.8h, v6.8h, #6
+ uaddw v5.8h, v5.8h, v11.8b
+ srshr v7.8h, v7.8h, #6
+ sub x0, x0, x1, lsl #2
+ uaddw v6.8h, v6.8h, v2.8b
+ sqxtun v4.8b, v4.8h
+ uaddw v7.8h, v7.8h, v3.8b
+ sqxtun v5.8b, v5.8h
+ st1 {v4.8b}, [x0], x1
+ sqxtun v6.8b, v6.8h
+ st1 {v5.8b}, [x0], x1
+ sqxtun v7.8b, v7.8h
+ st1 {v6.8b}, [x0], x1
+ st1 {v7.8b}, [x0], x1
+.endm
+ load_acc_store v31.8h, v30.8h, v29.8h, v28.8h
+ load_acc_store v27.8h, v26.8h, v25.8h, v24.8h
+ load_acc_store v23.8h, v22.8h, v21.8h, v20.8h
+ load_acc_store v19.8h, v18.8h, v17.8h, v16.8h
+ sub x2, x2, x9
+ load_acc_store v16.8h, v17.8h, v18.8h, v19.8h, 1
+ load_acc_store v20.8h, v21.8h, v22.8h, v23.8h, 1
+ load_acc_store v24.8h, v25.8h, v26.8h, v27.8h, 1
+ load_acc_store v28.8h, v29.8h, v30.8h, v31.8h, 1
+.purgem load_acc_store
+ br x14
+endfunc
+.endm
+
+idct32_funcs
+idct32_funcs _quarter
+idct32_funcs _half
+
+const min_eob_idct_idct_32, align=4
+ .short 0, 34, 135, 336
+endconst
+
+function ff_vp9_idct_idct_32x32_add_neon, export=1
+ cmp w3, #1
+ b.eq idct32x32_dc_add_neon
+
+ movrel x10, idct_coeffs
+
+ mov x15, x30
+
+ stp d10, d11, [sp, #-0x10]!
+ stp d8, d9, [sp, #-0x10]!
+
+ sub sp, sp, #2048
+
+ mov x4, x0
+ mov x5, x1
+ mov x6, x2
+
+ // Double stride of the input, since we only read every other line
+ mov x9, #128
+ neg x7, x9
+
+ ld1 {v0.8h,v1.8h}, [x10], #32
+ ld1 {v8.8h,v9.8h}, [x10]
+
+ cmp w3, #34
+ b.le idct32x32_quarter_add_neon
+ cmp w3, #135
+ b.le idct32x32_half_add_neon
+
+ movrel x12, min_eob_idct_idct_32, 2
+
+.irp i, 0, 8, 16, 24
+ add x0, sp, #(\i*64)
+.if \i > 0
+ ldrh w1, [x12], #2
+ cmp w3, w1
+ mov x1, #(32 - \i)/4
+ b.le 1f
+.endif
+ add x2, x6, #(\i*2)
+ bl idct32_1d_8x32_pass1_neon
+.endr
+ b 3f
+
+1:
+ // Write zeros to the temp buffer for pass 2
+ movi v16.8h, #0
+ movi v17.8h, #0
+ movi v18.8h, #0
+ movi v19.8h, #0
+2:
+ subs x1, x1, #1
+.rept 4
+ st1 {v16.8h,v17.8h,v18.8h,v19.8h}, [x0], #64
+.endr
+ b.ne 2b
+3:
+.irp i, 0, 8, 16, 24
+ add x0, x4, #(\i)
+ mov x1, x5
+ add x2, sp, #(\i*2)
+ bl idct32_1d_8x32_pass2_neon
+.endr
+
+ add sp, sp, #2048
+
+ ldp d8, d9, [sp], 0x10
+ ldp d10, d11, [sp], 0x10
+
+ br x15
+endfunc
+
+.macro idct32_partial size
+function idct32x32_\size\()_add_neon
+ add x0, sp, #(0*64)
+ add x2, x6, #(0*2)
+ bl idct32_1d_8x32_pass1_\size\()_neon
+.ifc \size,half
+ add x0, sp, #(8*64)
+ add x2, x6, #(8*2)
+ bl idct32_1d_8x32_pass1_\size\()_neon
+.endif
+.irp i, 0, 8, 16, 24
+ add x0, x4, #(\i)
+ mov x1, x5
+ add x2, sp, #(\i*2)
+ bl idct32_1d_8x32_pass2_\size\()_neon
+.endr
+
+ add sp, sp, #2048
+
+ ldp d8, d9, [sp], 0x10
+ ldp d10, d11, [sp], 0x10
+
+ br x15
+endfunc
+.endm
+
+idct32_partial quarter
+idct32_partial half
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