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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98302] New: [11 Regression] Wrong code on aarch64
Date: Tue, 15 Dec 2020 21:15:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98302

            Bug ID: 98302
           Summary: [11 Regression] Wrong code on aarch64
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rsandifo at gcc dot gnu.org
  Target Milestone: ---
              Host: aarch64-linux-gnu
            Target: aarch64-linux-gnu

Started with a costing model change, and I can reproduce it only on aarch64.
The test-case is hard to reduce and comes from yarpgen:

$ g++ -O3 func.ii -c
$ g++ driver.ii -c
$ g++ *.o

$ ./a.out
a.out: driver.cpp:1143: void checksum(): Assertion `var_135 =3D=3D (unsigned
char)0' failed.
Aborted (core dumped)

It's caused by vect_loop, and g++ -O3 func.ii -c -fdbg-cnt=3Dvect_loop:1 is=
 first
value that causes that.=