[PATCH] D113577: [SCEV] Support rewriting ZExt expressions with loop guard info.

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

In D113577#3131976 <https://reviews.llvm.org/D113577#3131976>, @fhahn wrote:

> rebased.
>
> @nikic it looks like there's a crash on the llvm-compile-time-tracker with the latest version (applying rewrites), but I was unable to reproduce this locally with various combinations of flags. What compiler/flags is used by the tracker to build the compiler used?
>
> The log to the failure is http://llvm-compile-time-tracker.com/show_error.php?commit=d628e5e177b9a9dd4f279ce7c301fd312be0cfa7 in case you have any ideas.

Here's the (unreduced) IR, crashes for me under `opt -O1`: https://gist.github.com/nikic/bd117601aedea5f03b5750571d07624e

I just ran the `/root/llvm-compile-time-tracker/llvm-project-build/bin/clang -DNDEBUG  -fno-experimental-new-pass-manager -O3 -fomit-frame-pointer -flto -DNDEBUG -g   -w -Werror=date-time -MD -MT tools/CMakeFiles/fpcmp-target.dir/fpcmp.c.o -MF tools/CMakeFiles/fpcmp-target.dir/fpcmp.c.o.d -o tools/CMakeFiles/fpcmp-target.dir/fpcmp.c.o   -c /root/llvm-compile-time-tracker/llvm-test-suite/tools/fpcmp.c` command after adjusting to local paths, but sometimes these things depend on external deps like the used libc.


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