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Diffstat (limited to 'media/libstagefright/codecs/on2/h264dec/omxdl/arm_neon/vc/m4p10/src/armVCM4P10_UnpackBlock4x4_s.s')
| -rwxr-xr-x | media/libstagefright/codecs/on2/h264dec/omxdl/arm_neon/vc/m4p10/src/armVCM4P10_UnpackBlock4x4_s.s | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/on2/h264dec/omxdl/arm_neon/vc/m4p10/src/armVCM4P10_UnpackBlock4x4_s.s b/media/libstagefright/codecs/on2/h264dec/omxdl/arm_neon/vc/m4p10/src/armVCM4P10_UnpackBlock4x4_s.s new file mode 100755 index 0000000..4c52e22 --- /dev/null +++ b/media/libstagefright/codecs/on2/h264dec/omxdl/arm_neon/vc/m4p10/src/armVCM4P10_UnpackBlock4x4_s.s @@ -0,0 +1,92 @@ +;// +;// +;// File Name: armVCM4P10_UnpackBlock4x4_s.s +;// OpenMAX DL: v1.0.2 +;// Revision: 12290 +;// Date: Wednesday, April 9, 2008 +;// +;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. +;// +;// +;// + + + INCLUDE omxtypes_s.h + INCLUDE armCOMM_s.h + +;// Define the processor variants supported by this file + + M_VARIANTS ARM1136JS + + + IF ARM1136JS + +;//-------------------------------------- +;// Input Arguments and their scope/usage +;//-------------------------------------- +ppSrc RN 0 ;// Persistent variable +pDst RN 1 ;// Persistent variable + +;//-------------------------------- +;// Variables and their scope/usage +;//-------------------------------- +pSrc RN 2 ;// Persistent variables +Flag RN 3 +Value RN 4 +Value2 RN 5 +strOffset RN 6 +cstOffset RN 7 + + + M_START armVCM4P10_UnpackBlock4x4, r7 + + LDR pSrc, [ppSrc] ;// Load pSrc + MOV cstOffset, #31 ;// To be used in the loop, to compute offset + + ;//----------------------------------------------------------------------- + ; Firstly, fill all the coefficient values on the <pDst> buffer by zero + ;//----------------------------------------------------------------------- + + MOV Value, #0 ;// Initialize the zero value + MOV Value2, #0 ;// Initialize the zero value + LDRB Flag, [pSrc], #1 ;// Preload <Flag> before <unpackLoop> + + STRD Value, [pDst, #0] ;// pDst[0] = pDst[1] = pDst[2] = pDst[3] = 0 + STRD Value, [pDst, #8] ;// pDst[4] = pDst[5] = pDst[6] = pDst[7] = 0 + STRD Value, [pDst, #16] ;// pDst[8] = pDst[9] = pDst[10] = pDst[11] = 0 + STRD Value, [pDst, #24] ;// pDst[12] = pDst[13] = pDst[14] = pDst[15] = 0 + + ;//---------------------------------------------------------------------------- + ;// The loop below parses and unpacks the input stream. The C-model has + ;// a somewhat complicated logic for sign extension. But in the v6 version, + ;// that can be easily taken care by loading the data from <pSrc> stream as + ;// SIGNED byte/halfword. So, based on the first TST instruction, 8-bits or + ;// 16-bits are read. + ;// + ;// Next, to compute the offset, where the unpacked value needs to be stored, + ;// we modify the computation to perform [(Flag & 15) < 1] as [(Flag < 1) & 31] + ;// This results in a saving of one cycle. + ;//---------------------------------------------------------------------------- + +unpackLoop + TST Flag, #0x10 ;// Computing (Flag & 0x10) + LDRSBNE Value2,[pSrc,#1] ;// Load byte wise to avoid unaligned access + LDRBNE Value, [pSrc], #2 + AND strOffset, cstOffset, Flag, LSL #1 ;// strOffset = (Flag & 15) < 1; + LDRSBEQ Value, [pSrc], #1 ;// Value = (OMX_U8) *pSrc++ + ORRNE Value,Value,Value2, LSL #8 ;// Value = (OMX_U16) *pSrc++ + + TST Flag, #0x20 ;// Computing (Flag & 0x20) to check, if we're done + LDRBEQ Flag, [pSrc], #1 ;// Flag = (OMX_U8) *pSrc++, for next iteration + STRH Value, [pDst, strOffset] ;// Store <Value> at offset <strOffset> + BEQ unpackLoop ;// Branch to the loop beginning + + STR pSrc, [ppSrc] ;// Update the bitstream pointer + M_END + + ENDIF + + + + END +
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