[PATCH] D35005: [ELF] - Do not apply relocations to .debug_ranges when building -gdb-index

[George Rimar via Phabricator via llvm-commits]

grimar created this revision.
Herald added a subscriber: emaste.

Looks we do not really need to apply relocations to .debug_ranges section 
when building .gdb_index.

What we need is to scan relocations and take target section indices use addends
as begin
That allows to skip actual relocations computations and speedups building .gdb_index.

When linking llc binary with -gdb-index numbers I got (from 25 runs) were:

- Without this patch: 5,724493319 seconds time elapsed ( +-  0,13% )
- With this path: 5,352222105 seconds time elapsed  ( +-  0,10% )

It is about 6.5% speedup.


https://reviews.llvm.org/D35005

Files:
  ELF/SyntheticSections.cpp

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