[llvm-bugs] [Bug 46331] New: Merge 0cecafd647cc into 10.0.1

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Jun 15 10:40:42 PDT 2020


            Bug ID: 46331
           Summary: Merge 0cecafd647cc into 10.0.1
           Product: new-bugs
           Version: 10.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Please merge https://reviews.llvm.org/rG0cecafd647cc into 10.0.1. As described
in https://bugs.freebsd.org/246630, clang's new -fintegrated-cc1 default
(introduced in https://reviews.llvm.org/rGc4a134a5107c and some follow-up
commits) appears to have uncovered non-determinism in the assembly output. This
is further described in https://reviews.llvm.org/D69825, the original review

In FreeBSD I have worked around the problem temporarily, by setting
CLANG_SPAWN_CC1 back to 1, so a fresh clang -cc1 process is executed.

But after some more testing and bisecting, I found out that the non-determinism
is actually fixed by https://reviews.llvm.org/rG0cecafd647cc ("[BasicAA] Make
BasicAA a cfg pass"). In https://reviews.llvm.org/D69825#2091632 I've asked
@asbirlea if this was an intended side-effect of the commit, or if there is
something different going on.

In any case, this bug should be solved one way or another in 10.0.1, as
non-determinism is obviously a blocker.

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