2013-10-31 18:06:23 +01:00
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;
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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 |vp9_idct32x32_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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;TODO(hkuang): put the following macros in a seperate
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;file so other idct function could also use them.
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MACRO
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LD_16x8 $src, $stride
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vld1.8 {q8}, [$src], $stride
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vld1.8 {q9}, [$src], $stride
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vld1.8 {q10}, [$src], $stride
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vld1.8 {q11}, [$src], $stride
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vld1.8 {q12}, [$src], $stride
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vld1.8 {q13}, [$src], $stride
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vld1.8 {q14}, [$src], $stride
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vld1.8 {q15}, [$src], $stride
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MEND
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MACRO
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ADD_DIFF_16x8 $diff
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vqadd.u8 q8, q8, $diff
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vqadd.u8 q9, q9, $diff
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vqadd.u8 q10, q10, $diff
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vqadd.u8 q11, q11, $diff
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vqadd.u8 q12, q12, $diff
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vqadd.u8 q13, q13, $diff
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vqadd.u8 q14, q14, $diff
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vqadd.u8 q15, q15, $diff
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MEND
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MACRO
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SUB_DIFF_16x8 $diff
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vqsub.u8 q8, q8, $diff
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vqsub.u8 q9, q9, $diff
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vqsub.u8 q10, q10, $diff
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vqsub.u8 q11, q11, $diff
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vqsub.u8 q12, q12, $diff
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vqsub.u8 q13, q13, $diff
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vqsub.u8 q14, q14, $diff
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vqsub.u8 q15, q15, $diff
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MEND
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MACRO
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ST_16x8 $dst, $stride
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vst1.8 {q8}, [$dst], $stride
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vst1.8 {q9}, [$dst], $stride
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vst1.8 {q10},[$dst], $stride
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vst1.8 {q11},[$dst], $stride
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vst1.8 {q12},[$dst], $stride
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vst1.8 {q13},[$dst], $stride
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vst1.8 {q14},[$dst], $stride
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vst1.8 {q15},[$dst], $stride
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MEND
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;void vp9_idct32x32_1_add_neon(int16_t *input, uint8_t *dest,
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; int dest_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 dest_stride
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|vp9_idct32x32_1_add_neon| PROC
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push {lr}
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pld [r1]
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add r3, r1, #16 ; r3 dest + 16 for second loop
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ldrsh r0, [r0]
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; generate cospi_16_64 = 11585
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mov r12, #0x2d00
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add r12, #0x41
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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, 6)
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add r0, r0, #32 ; + (1 <<((6) - 1))
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asrs r0, r0, #6 ; >> 6
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bge diff_positive_32_32
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diff_negative_32_32
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neg r0, r0
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usat r0, #8, r0
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vdup.u8 q0, r0
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mov r0, #4
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diff_negative_32_32_loop
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sub r0, #1
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LD_16x8 r1, r2
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SUB_DIFF_16x8 q0
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ST_16x8 r12, r2
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LD_16x8 r1, r2
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SUB_DIFF_16x8 q0
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ST_16x8 r12, r2
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cmp r0, #2
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moveq r1, r3
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moveq r12, r3
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cmp r0, #0
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bne diff_negative_32_32_loop
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2013-11-11 21:49:12 +01:00
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pop {pc}
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2013-10-31 18:06:23 +01:00
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diff_positive_32_32
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usat r0, #8, r0
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vdup.u8 q0, r0
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mov r0, #4
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diff_positive_32_32_loop
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sub r0, #1
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LD_16x8 r1, r2
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ADD_DIFF_16x8 q0
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ST_16x8 r12, r2
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LD_16x8 r1, r2
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ADD_DIFF_16x8 q0
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ST_16x8 r12, r2
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cmp r0, #2
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moveq r1, r3
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moveq r12, r3
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cmp r0, #0
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bne diff_positive_32_32_loop
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pop {pc}
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ENDP ; |vp9_idct32x32_1_add_neon|
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END
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