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With a LTO build of a large project (>11k subfiles incrementially linked) storing the LTO resolutions took over 0.5GB memory: lto/lto.c:1087 (lto_resolution_read) 0: 0.0% 540398500 15903: 0.0% The reason is that the declaration indexes are quite sparse, but every subfile got a full continuous vector for them. Since there are so many of them the many vectors add up. This patch instead stores the resolutions initially in a compact (index, resolution) format. This is only expanded into a sparse vector for fast lookup when the subfile is actually read, but then immediately freed. This means only one vector is allocated at a time. This brings the overhead for this down to less than 3MB for the test case: lto/lto.c:1087 (lto_resolution_read) 0: 0.0% 2821456 42186: 0.0% gcc/: 2012-09-06 Andi Kleen <ak@linux.intel.com> * gcc/lto-streamer.h (res_pair): Add. (lto_file_decl_data): Replace resolutions with respairs. Add max_index. * gcc/lto/lto.c (lto_resolution_read): Remove max_index. Add rp. Initialize respairs. (lto_file_finalize): Set up resolutions vector lazily from respairs. From-SVN: r191051
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