videolan/ffmpeg
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Make the jump-table section-relative for x86_64 with PIC enabled.

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This allows to get rid of the macho64 specific hack that moves them
to rodata (with worse cache behaviour) and avoids textrels which
e.g. Gentoo does not allow for x86_64 libraries.

Originally committed as revision 21551 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-01-30 19:26:47 +00:00
parent 718c7b18c9
commit 3d05c1fbec
1 changed files with 12 additions and 7 deletions
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19
libavcodec/x86/fft_mmx.asm
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@ -419,18 +419,23 @@ DECL_PASS pass_interleave_3dn, PASS_BIG 0
%define pass_3dn2 pass_3dn
%define pass_interleave_3dn2 pass_interleave_3dn
%ifdef PIC
%define SECTION_REL - $$
%else
%define SECTION_REL
%endif
%macro DECL_FFT 2-3 ; nbits, cpu, suffix
%xdefine list_of_fft fft4%2, fft8%2
%xdefine list_of_fft fft4%2 SECTION_REL, fft8%2 SECTION_REL
%if %1==5
%xdefine list_of_fft list_of_fft, fft16%2
%xdefine list_of_fft list_of_fft, fft16%2 SECTION_REL
%endif
%assign n 1<<%1
%rep 17-%1
%assign n2 n/2
%assign n4 n/4
%xdefine list_of_fft list_of_fft, fft %+ n %+ %3%2
%xdefine list_of_fft list_of_fft, fft %+ n %+ %3%2 SECTION_REL
align 16
fft %+ n %+ %3%2:
@ -448,10 +453,6 @@ fft %+ n %+ %3%2:
%endrep
%undef n
%ifidn __OUTPUT_FORMAT__,macho64
section .rodata
%endif
align 8
dispatch_tab%3%2: pointer list_of_fft
@ -462,6 +463,10 @@ section .text
cglobal fft_dispatch%3%2, 2,5,8, z, nbits
lea r2, [dispatch_tab%3%2 GLOBAL]
mov r2, [r2 + (nbitsq-2)*gprsize]
%ifdef PIC
lea r3, [$$ GLOBAL]
add r2, r3
%endif
call r2
RET
%endmacro ; DECL_FFT