e8999309f1
When iterating over function records, filtered by file name, currently,
the iteration goes over all the function records, repeatedly for each
source file, essentially giving quadratic behavior.
413647d730 sped up some cases by keeping
track of the indices of the function records corresponding to each file
name. This change expands the use of that map to FunctionRecordIterator.
On a test case with Firefox's libxul.so and a 2.5MB profile, this brings
down the runtime of `llvm-cov export $lib --instr-profile $prof -t lcov`
from 12 minutes with 90% spent in skipOtherFiles to 19 seconds with no
samples in skipOtherFiles at all under a sampling profiler (with a
sampling interval of 1ms).
Fixes #62079
59 KiB
59 KiB