[llvm-bugs] [Bug 34023] New: Large amount of time taken in ScalarEvolution
llvm-bugs at lists.llvm.org
Tue Aug 1 11:12:55 PDT 2017
Bug ID: 34023
Summary: Large amount of time taken in ScalarEvolution
OS: Windows NT
Component: Backend: X86
Assignee: unassignedbugs at nondot.org
Reporter: alex at crichton.co
CC: llvm-bugs at lists.llvm.org
Originally reported at https://github.com/rust-lang/rust/issues/43418, we got a
reduced test case in Rust and I used `bugpoint` to reduce that even further to
yield a wad of IR located at
If that IR (relatively small) is compiled with:
llc -O1 -filetype=obj foo.ll -o foo.o
it takes ~30s locally on my machine (the timeout I passed to `bugpoint`). The
original test case (which I can also get the IR if if you'd like) took much
much longer, but presumably may have exited at some point!
Also not I'm not entirely ertain that this is in ScalarEvolution, so please
feel free to retitle the bug!
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