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Diffstat (limited to 'vp8/common/arm/neon/shortidct4x4llm_neon.asm')
| -rw-r--r-- | vp8/common/arm/neon/shortidct4x4llm_neon.asm | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/vp8/common/arm/neon/shortidct4x4llm_neon.asm b/vp8/common/arm/neon/shortidct4x4llm_neon.asm new file mode 100644 index 000000000..ffecfbfbc --- /dev/null +++ b/vp8/common/arm/neon/shortidct4x4llm_neon.asm @@ -0,0 +1,126 @@ +; +; Copyright (c) 2010 The VP8 project authors. All Rights Reserved. +; +; Use of this source code is governed by a BSD-style license and patent +; grant that can be found in the LICENSE file in the root of the source +; tree. All contributing project authors may be found in the AUTHORS +; file in the root of the source tree. +; + + + EXPORT |vp8_short_idct4x4llm_neon| + ARM + REQUIRE8 + PRESERVE8 + + AREA ||.text||, CODE, READONLY, ALIGN=2 + +;************************************************************* +;void vp8_short_idct4x4llm_c(short *input, short *output, int pitch) +;r0 short * input +;r1 short * output +;r2 int pitch +;************************************************************* +;static const int cospi8sqrt2minus1=20091; +;static const int sinpi8sqrt2 =35468; +;static const int rounding = 0; +;Optimization note: The resulted data from dequantization are signed 13-bit data that is +;in the range of [-4096, 4095]. This allows to use "vqdmulh"(neon) instruction since +;it won't go out of range (13+16+1=30bits<32bits). This instruction gives the high half +;result of the multiplication that is needed in IDCT. + +|vp8_short_idct4x4llm_neon| PROC + ldr r12, _idct_coeff_ + vld1.16 {q1, q2}, [r0] + vld1.16 {d0}, [r12] + + vswp d3, d4 ;q2(vp[4] vp[12]) + + vqdmulh.s16 q3, q2, d0[2] + vqdmulh.s16 q4, q2, d0[0] + + vqadd.s16 d12, d2, d3 ;a1 + vqsub.s16 d13, d2, d3 ;b1 + + vshr.s16 q3, q3, #1 + vshr.s16 q4, q4, #1 + + vqadd.s16 q3, q3, q2 ;modify since sinpi8sqrt2 > 65536/2 (negtive number) + vqadd.s16 q4, q4, q2 + + ;d6 - c1:temp1 + ;d7 - d1:temp2 + ;d8 - d1:temp1 + ;d9 - c1:temp2 + + vqsub.s16 d10, d6, d9 ;c1 + vqadd.s16 d11, d7, d8 ;d1 + + vqadd.s16 d2, d12, d11 + vqadd.s16 d3, d13, d10 + vqsub.s16 d4, d13, d10 + vqsub.s16 d5, d12, d11 + + vtrn.32 d2, d4 + vtrn.32 d3, d5 + vtrn.16 d2, d3 + vtrn.16 d4, d5 + + vswp d3, d4 + + vqdmulh.s16 q3, q2, d0[2] + vqdmulh.s16 q4, q2, d0[0] + + vqadd.s16 d12, d2, d3 ;a1 + vqsub.s16 d13, d2, d3 ;b1 + + vshr.s16 q3, q3, #1 + vshr.s16 q4, q4, #1 + + vqadd.s16 q3, q3, q2 ;modify since sinpi8sqrt2 > 65536/2 (negtive number) + vqadd.s16 q4, q4, q2 + + vqsub.s16 d10, d6, d9 ;c1 + vqadd.s16 d11, d7, d8 ;d1 + + vqadd.s16 d2, d12, d11 + vqadd.s16 d3, d13, d10 + vqsub.s16 d4, d13, d10 + vqsub.s16 d5, d12, d11 + + vrshr.s16 d2, d2, #3 + vrshr.s16 d3, d3, #3 + vrshr.s16 d4, d4, #3 + vrshr.s16 d5, d5, #3 + + add r3, r1, r2 + add r12, r3, r2 + add r0, r12, r2 + + vtrn.32 d2, d4 + vtrn.32 d3, d5 + vtrn.16 d2, d3 + vtrn.16 d4, d5 + + vst1.16 {d2}, [r1] + vst1.16 {d3}, [r3] + vst1.16 {d4}, [r12] + vst1.16 {d5}, [r0] + + bx lr + + ENDP + +;----------------- + AREA idct4x4_dat, DATA, READWRITE ;read/write by default +;Data section with name data_area is specified. DCD reserves space in memory for 48 data. +;One word each is reserved. Label filter_coeff can be used to access the data. +;Data address: filter_coeff, filter_coeff+4, filter_coeff+8 ... +_idct_coeff_ + DCD idct_coeff +idct_coeff + DCD 0x4e7b4e7b, 0x8a8c8a8c + +;20091, 20091, 35468, 35468 + + END |