11a222f5d9
Adds following targets to configure script to support RVCT compilation without operating system support (for Profiler or bare metal images). - armv5te-none-rvct - armv6-none-rvct - armv7-none-rvct To strip OS specific parts from the code "os_support"-config was added to script and CONFIG_OS_SUPPORT flag is used in the code to exclude OS specific parts such as OS specific includes and function calls for timers and threads etc. This was done to enable RVCT compilation for profiling purposes or running the image on bare metal target with Lauterbach. Removed separate AREA directives for READONLY data in armv6 and neon assembly files to fix the RVCT compilation. Otherwise "ldr <reg>, =label" syntax would have been needed to prevent linker errors. This syntax is not supported by older gnu assemblers. Change-Id: I14f4c68529e8c27397502fbc3010a54e505ddb43
125 lines
3.3 KiB
NASM
125 lines
3.3 KiB
NASM
;
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; Copyright (c) 2010 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
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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EXPORT |vp8_short_idct4x4llm_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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;*************************************************************
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;void vp8_short_idct4x4llm_c(short *input, short *output, int pitch)
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;r0 short * input
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;r1 short * output
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;r2 int pitch
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;*************************************************************
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;static const int cospi8sqrt2minus1=20091;
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;static const int sinpi8sqrt2 =35468;
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;static const int rounding = 0;
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;Optimization note: The resulted data from dequantization are signed 13-bit data that is
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;in the range of [-4096, 4095]. This allows to use "vqdmulh"(neon) instruction since
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;it won't go out of range (13+16+1=30bits<32bits). This instruction gives the high half
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;result of the multiplication that is needed in IDCT.
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|vp8_short_idct4x4llm_neon| PROC
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ldr r12, _idct_coeff_
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vld1.16 {q1, q2}, [r0]
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vld1.16 {d0}, [r12]
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vswp d3, d4 ;q2(vp[4] vp[12])
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vqdmulh.s16 q3, q2, d0[2]
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vqdmulh.s16 q4, q2, d0[0]
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vqadd.s16 d12, d2, d3 ;a1
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vqsub.s16 d13, d2, d3 ;b1
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vshr.s16 q3, q3, #1
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vshr.s16 q4, q4, #1
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vqadd.s16 q3, q3, q2 ;modify since sinpi8sqrt2 > 65536/2 (negtive number)
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vqadd.s16 q4, q4, q2
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;d6 - c1:temp1
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;d7 - d1:temp2
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;d8 - d1:temp1
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;d9 - c1:temp2
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vqsub.s16 d10, d6, d9 ;c1
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vqadd.s16 d11, d7, d8 ;d1
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vqadd.s16 d2, d12, d11
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vqadd.s16 d3, d13, d10
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vqsub.s16 d4, d13, d10
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vqsub.s16 d5, d12, d11
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vtrn.32 d2, d4
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vtrn.32 d3, d5
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vtrn.16 d2, d3
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vtrn.16 d4, d5
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vswp d3, d4
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vqdmulh.s16 q3, q2, d0[2]
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vqdmulh.s16 q4, q2, d0[0]
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vqadd.s16 d12, d2, d3 ;a1
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vqsub.s16 d13, d2, d3 ;b1
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vshr.s16 q3, q3, #1
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vshr.s16 q4, q4, #1
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vqadd.s16 q3, q3, q2 ;modify since sinpi8sqrt2 > 65536/2 (negtive number)
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vqadd.s16 q4, q4, q2
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vqsub.s16 d10, d6, d9 ;c1
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vqadd.s16 d11, d7, d8 ;d1
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vqadd.s16 d2, d12, d11
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vqadd.s16 d3, d13, d10
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vqsub.s16 d4, d13, d10
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vqsub.s16 d5, d12, d11
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vrshr.s16 d2, d2, #3
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vrshr.s16 d3, d3, #3
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vrshr.s16 d4, d4, #3
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vrshr.s16 d5, d5, #3
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add r3, r1, r2
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add r12, r3, r2
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add r0, r12, r2
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vtrn.32 d2, d4
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vtrn.32 d3, d5
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vtrn.16 d2, d3
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vtrn.16 d4, d5
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vst1.16 {d2}, [r1]
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vst1.16 {d3}, [r3]
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vst1.16 {d4}, [r12]
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vst1.16 {d5}, [r0]
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bx lr
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ENDP
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;-----------------
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_idct_coeff_
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DCD idct_coeff
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idct_coeff
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DCD 0x4e7b4e7b, 0x8a8c8a8c
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;20091, 20091, 35468, 35468
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END
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