[Bug 383240] Re: Integrate and enable ARMv5TE/v6/VFP and NEON optimisations from ffmpeg trunk for armel

[Loïc Minier]

So the regular aes.o for neon has this in the output of arm-none-linux-gnueabi-readelf -a libavutil/aes.o.neon:
...
Relocation section '.rel.text' at offset 0x3a64 contains 30 entries:
 Offset     Info    Type            Sym.Value  Sym. Name
0000000c  0000092b R_ARM_MOVW_ABS_NC 00000000   .LANCHOR0
00000010  0000092c R_ARM_MOVT_ABS    00000000   .LANCHOR0
000000a0  00000a2b R_ARM_MOVW_ABS_NC 00001ff8   .LANCHOR1
000000a8  00000a2c R_ARM_MOVT_ABS    00001ff8   .LANCHOR1
00000100  00000b2b R_ARM_MOVW_ABS_NC 00000000   .LANCHOR2
00000104  00000b2c R_ARM_MOVT_ABS    00000000   .LANCHOR2
0000019c  0000092b R_ARM_MOVW_ABS_NC 00000000   .LANCHOR0
...

I prepended -fPIC to the gcc flags and now the reltext table is much smaller and says:
Relocation section '.rel.text' at offset 0x3cbc contains 13 entries:
 Offset     Info    Type            Sym.Value  Sym. Name
000002c8  0000271b R_ARM_PLT32       00000000   memcpy
00000320  0000271b R_ARM_PLT32       00000000   memcpy
0000072c  0000271b R_ARM_PLT32       00000000   memcpy
00000940  0000271b R_ARM_PLT32       00000000   memcpy
00000968  00002819 R_ARM_BASE_PREL   00000000   _GLOBAL_OFFSET_TABLE_
0000096c  00001618 R_ARM_GOTOFF32    00000000   .LANCHOR0
00000970  00001718 R_ARM_GOTOFF32    00001ff8   .LANCHOR1
00000974  00001118 R_ARM_GOTOFF32    00000000   .LANCHOR2
00000d70  0000271b R_ARM_PLT32       00000000   memcpy
00001050  0000271b R_ARM_PLT32       00000000   memcpy
000010b0  00002819 R_ARM_BASE_PREL   00000000   _GLOBAL_OFFSET_TABLE_
000010b4  00001718 R_ARM_GOTOFF32    00001ff8   .LANCHOR1
000010b8  00001618 R_ARM_GOTOFF32    00000000   .LANCHOR0
(that's the full table)

Given that I don't see any _ABS thingies, I suspect it is good.

-- 
Integrate and enable ARMv5TE/v6/VFP and NEON optimisations from ffmpeg trunk for armel
https://bugs.launchpad.net/bugs/383240
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