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| author | Yi Kong <yikong@google.com> | 2020-09-23 00:54:50 +0800 |
|---|---|---|
| committer | Yi Kong <yikong@google.com> | 2020-09-23 01:32:06 +0800 |
| commit | 2f5f16d574d522bc5f4f81ee7e1a9cc981340a23 (patch) | |
| tree | c4e1c662fb153f715fdea3427bff195787091423 /java/java.go | |
| parent | c5a0e64d82f158b4d00036bf7d5ba765fdf9c906 (diff) | |
Tweak ThinLTO inling heuristics in absense of PGO profile
We previously disabled inlining and unrolling completely during ThinLTO
in absense of PGO profile. For global ThinLTO, we want to better balance
binary size and performance.
We evaluated a number of combination of heuristics with global ThinLTO
configuration:
binary size change
no LTO baseline
no inline, no unroll -0.54%
no inline, unroll -0.50%
import-instr-limit=5, unroll +0.02%
import-instr-limit=10, unroll +0.13%
Loop unrolling does not contribute much to the binary size, therefore
it is re-enabled.
import-instr-limit=5 balances the binary size savings from ThinLTO and
size incrase due to additional optimisation.
Bug: 78485207
Bug: 169004486
Test: TreeHugger
Change-Id: I1c21153605e2ae42daa8857b06e27c081ee8ad85
Diffstat (limited to 'java/java.go')
0 files changed, 0 insertions, 0 deletions