67 lines
2.1 KiB
NASM
67 lines
2.1 KiB
NASM
;
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; Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license and patent
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; grant that can be found in the LICENSE file in the root of the source
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; tree. All contributing project authors may be found in the AUTHORS
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; file in the root of the source tree.
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;
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EXPORT |vpx_idct4x4_1_add_neon|
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ARM
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REQUIRE8
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PRESERVE8
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AREA ||.text||, CODE, READONLY, ALIGN=2
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;void vpx_idct4x4_1_add_neon(int16_t *input, uint8_t *dest, int stride)
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;
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; r0 int16_t input
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; r1 uint8_t *dest
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; r2 int stride)
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|vpx_idct4x4_1_add_neon| PROC
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ldrsh r0, [r0]
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; cospi_16_64 = 11585
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movw r12, #0x2d41
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; out = dct_const_round_shift(input[0] * cospi_16_64)
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mul r0, r0, r12 ; input[0] * cospi_16_64
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add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
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asr r0, r0, #14 ; >> DCT_CONST_BITS
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; out = dct_const_round_shift(out * cospi_16_64)
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mul r0, r0, r12 ; out * cospi_16_64
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mov r12, r1 ; save dest
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add r0, r0, #0x2000 ; +(1 << ((DCT_CONST_BITS) - 1))
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asr r0, r0, #14 ; >> DCT_CONST_BITS
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; a1 = ROUND_POWER_OF_TWO(out, 4)
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add r0, r0, #8 ; + (1 <<((4) - 1))
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asr r0, r0, #4 ; >> 4
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vdup.s16 q0, r0 ; duplicate a1
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vld1.32 {d2[0]}, [r1], r2
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vld1.32 {d2[1]}, [r1], r2
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vld1.32 {d4[0]}, [r1], r2
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vld1.32 {d4[1]}, [r1]
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vaddw.u8 q8, q0, d2 ; dest[x] + a1
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vaddw.u8 q9, q0, d4
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vqmovun.s16 d6, q8 ; clip_pixel
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vqmovun.s16 d7, q9
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vst1.32 {d6[0]}, [r12], r2
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vst1.32 {d6[1]}, [r12], r2
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vst1.32 {d7[0]}, [r12], r2
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vst1.32 {d7[1]}, [r12]
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bx lr
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ENDP ; |vpx_idct4x4_1_add_neon|
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END
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