https://bugs.llvm.org/show_bug.cgi?id=50155
Bug ID: 50155
Summary: [InstCombine] Taking an order of magnitude longer in
12.0.0 than in 10.0.0 for some examples.
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 24809
--> https://bugs.llvm.org/attachment.cgi?id=24809&action=edit
gzipped ir module exhibiting much slower InstCombine optimization pass.
For some functions, the --instcombine optimization takes excessively longer
with llvm 12.0.0 than it does with llvm 10.0.0.
In the attached example, a run of "opt -o=out.o --instcombine test_instcomb.ir"
takes 53 seconds, where it used to take around 2 seconds when version 10.0.0
was used (albeit version 12.0.0 combines more instructions).
Is there a way to mitigate this speed performance degradation when using the
library interface (i.e. from C++ library API, not from the opt tool)?
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