[llvm-bugs] [Bug 33321] New: Bitcode file with a large flat function takes a long time to compile with llc -O3
llvm-bugs at lists.llvm.org
Mon Jun 5 21:52:36 PDT 2017
Bug ID: 33321
Summary: Bitcode file with a large flat function takes a long
time to compile with llc -O3
OS: MacOS X
Component: Register Allocator
Assignee: unassignedbugs at nondot.org
Reporter: chris.schaf at verizon.net
CC: llvm-bugs at lists.llvm.org
My Common Lisp compiler (github.com/drmeister/clasp) generates a RUN-ALL
function for generating Common Lisp objects at startup. The time it takes
clang to compile this function scales roughly as N^3 where N is the number of
Use llc -O3 biglist20000.bc
This builds a 20,000 entry list
It takes more than 2 minutes on my machine.
With 7,000 entries it takes 7 seconds.
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