http://llvm.org/bugs/show_bug.cgi?id=16398
Bug ID: 16398
Summary: functionattrs exhibits superlinear behaviour
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Interprocedural Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This is broken out from bug 13263. On the attached .ll file, we see this:
===-------------------------------------------------------------------------===
... Pass execution timing report ...
===-------------------------------------------------------------------------===
Total Execution Time: 4.9600 seconds (4.9723 wall clock)
---User Time--- --System Time-- --User+System-- ---Wall Time--- ---
Name ---
3.8400 ( 78.0%) 0.0100 ( 25.0%) 3.8500 ( 77.6%) 3.8668 ( 77.8%)
Deduce function attributes
0.6800 ( 13.8%) 0.0000 ( 0.0%) 0.6800 ( 13.7%) 0.6421 ( 12.9%) SROA
0.1800 ( 3.7%) 0.0300 ( 75.0%) 0.2100 ( 4.2%) 0.1741 ( 3.5%)
Function Integration/Inlining
0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0000 ( 0.0%) 0.0570 ( 1.1%)
Module Verifier
[...]
The slowdown is happening inside AddNoCaptureAttrs, and the capture tracking
analysis happens to be trivial so that isn't the problem (and SCCNodes.size()
== 1 so that also isn't the problem). I'm placing my bet on inefficient
AttributeSet manipulation.
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