1 ; 2 ; Copyright (c) 2013 The WebM project authors. All Rights Reserved. 3 ; 4 ; Use of this source code is governed by a BSD-style license and patent 5 ; grant that can be found in the LICENSE file in the root of the source 6 ; tree. All contributing project authors may be found in the AUTHORS 7 ; file in the root of the source tree. 8 ; 9 10 EXPORT |vp9_idct32x32_1_add_neon| 11 ARM 12 REQUIRE8 13 PRESERVE8 14 15 AREA ||.text||, CODE, READONLY, ALIGN=2 16 17 ;TODO(hkuang): put the following macros in a seperate 18 ;file so other idct function could also use them. 19 MACRO 20 LD_16x8 $src, $stride 21 vld1.8 {q8}, [$src], $stride 22 vld1.8 {q9}, [$src], $stride 23 vld1.8 {q10}, [$src], $stride 24 vld1.8 {q11}, [$src], $stride 25 vld1.8 {q12}, [$src], $stride 26 vld1.8 {q13}, [$src], $stride 27 vld1.8 {q14}, [$src], $stride 28 vld1.8 {q15}, [$src], $stride 29 MEND 30 31 MACRO 32 ADD_DIFF_16x8 $diff 33 vqadd.u8 q8, q8, $diff 34 vqadd.u8 q9, q9, $diff 35 vqadd.u8 q10, q10, $diff 36 vqadd.u8 q11, q11, $diff 37 vqadd.u8 q12, q12, $diff 38 vqadd.u8 q13, q13, $diff 39 vqadd.u8 q14, q14, $diff 40 vqadd.u8 q15, q15, $diff 41 MEND 42 43 MACRO 44 SUB_DIFF_16x8 $diff 45 vqsub.u8 q8, q8, $diff 46 vqsub.u8 q9, q9, $diff 47 vqsub.u8 q10, q10, $diff 48 vqsub.u8 q11, q11, $diff 49 vqsub.u8 q12, q12, $diff 50 vqsub.u8 q13, q13, $diff 51 vqsub.u8 q14, q14, $diff 52 vqsub.u8 q15, q15, $diff 53 MEND 54 55 MACRO 56 ST_16x8 $dst, $stride 57 vst1.8 {q8}, [$dst], $stride 58 vst1.8 {q9}, [$dst], $stride 59 vst1.8 {q10},[$dst], $stride 60 vst1.8 {q11},[$dst], $stride 61 vst1.8 {q12},[$dst], $stride 62 vst1.8 {q13},[$dst], $stride 63 vst1.8 {q14},[$dst], $stride 64 vst1.8 {q15},[$dst], $stride 65 MEND 66 67 ;void vp9_idct32x32_1_add_neon(int16_t *input, uint8_t *dest, 68 ; int dest_stride) 69 ; 70 ; r0 int16_t input 71 ; r1 uint8_t *dest 72 ; r2 int dest_stride 73 74 |vp9_idct32x32_1_add_neon| PROC 75 push {lr} 76 pld [r1] 77 add r3, r1, #16 ; r3 dest + 16 for second loop 78 ldrsh r0, [r0] 79 80 ; generate cospi_16_64 = 11585 81 mov r12, #0x2d00 82 add r12, #0x41 83 84 ; out = dct_const_round_shift(input[0] * cospi_16_64) 85 mul r0, r0, r12 ; input[0] * cospi_16_64 86 add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1)) 87 asr r0, r0, #14 ; >> DCT_CONST_BITS 88 89 ; out = dct_const_round_shift(out * cospi_16_64) 90 mul r0, r0, r12 ; out * cospi_16_64 91 mov r12, r1 ; save dest 92 add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1)) 93 asr r0, r0, #14 ; >> DCT_CONST_BITS 94 95 ; a1 = ROUND_POWER_OF_TWO(out, 6) 96 add r0, r0, #32 ; + (1 <<((6) - 1)) 97 asrs r0, r0, #6 ; >> 6 98 bge diff_positive_32_32 99 100 diff_negative_32_32 101 neg r0, r0 102 usat r0, #8, r0 103 vdup.u8 q0, r0 104 mov r0, #4 105 106 diff_negative_32_32_loop 107 sub r0, #1 108 LD_16x8 r1, r2 109 SUB_DIFF_16x8 q0 110 ST_16x8 r12, r2 111 112 LD_16x8 r1, r2 113 SUB_DIFF_16x8 q0 114 ST_16x8 r12, r2 115 cmp r0, #2 116 moveq r1, r3 117 moveq r12, r3 118 cmp r0, #0 119 bne diff_negative_32_32_loop 120 pop {pc} 121 122 diff_positive_32_32 123 usat r0, #8, r0 124 vdup.u8 q0, r0 125 mov r0, #4 126 127 diff_positive_32_32_loop 128 sub r0, #1 129 LD_16x8 r1, r2 130 ADD_DIFF_16x8 q0 131 ST_16x8 r12, r2 132 133 LD_16x8 r1, r2 134 ADD_DIFF_16x8 q0 135 ST_16x8 r12, r2 136 cmp r0, #2 137 moveq r1, r3 138 moveq r12, r3 139 cmp r0, #0 140 bne diff_positive_32_32_loop 141 pop {pc} 142 143 ENDP ; |vp9_idct32x32_1_add_neon| 144 END 145
