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| author | Nikita Popov <nikita.ppv@gmail.com> | 2020-04-10 22:06:12 +0200 |
|---|---|---|
| committer | Nikita Popov <nikita.ppv@gmail.com> | 2020-04-15 20:02:11 +0200 |
| commit | 8e7d771cf9b6197c723e1ea8739563d24aca2e3c (patch) | |
| tree | 27b06b8ceaa726b48ac0526ea586397cdc90e58d /lldb/packages/Python/lldbsuite | |
| parent | a916e819275922ab9a350283a12647da6f4ad4b1 (diff) | |
| download | llvm-8e7d771cf9b6197c723e1ea8739563d24aca2e3c.zip llvm-8e7d771cf9b6197c723e1ea8739563d24aca2e3c.tar.gz llvm-8e7d771cf9b6197c723e1ea8739563d24aca2e3c.tar.bz2 | |
[MC] Use subclass data for MCExpr to reduce memory usage
MCExpr has a bunch of free space that is currently going to waste.
Repurpose it as 24 bits of subclass data, which is enough to reduce
the size of all subclasses by 8 bytes. This gives us some respectable
savings for debuginfo builds. Here are the max-rss reductions for the
fat LTO link step:
kc.link 238MiB 231MiB (-2.82%)
sqlite3.link 258MiB 250MiB (-3.27%)
consumer-typeset.link 152MiB 148MiB (-2.51%)
bullet.link 197MiB 192MiB (-2.30%)
tramp3d-v4.link 578MiB 567MiB (-1.92%)
pairlocalalign.link 92MiB 90MiB (-1.98%)
clamscan.link 230MiB 223MiB (-2.81%)
lencod.link 242MiB 235MiB (-2.67%)
SPASS.link 235MiB 230MiB (-2.23%)
7zip-benchmark.link 450MiB 435MiB (-3.25%)
Differential Revision: https://reviews.llvm.org/D77939
Diffstat (limited to 'lldb/packages/Python/lldbsuite')
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