[Bug tree-optimization/64910] tree reassociation results in poor code

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64910

Rainer Orth <ro at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ro at gcc dot gnu.org

--- Comment #5 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 42121
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42121&action=edit
32-bit sparc-sun-solaris2.11 pr64910-2.c.123t.reassoc1

The new test FAILs on both 32 and 64-bit Solaris/SPARC:

FAIL: gcc.dg/tree-ssa/pr64910-2.c scan-tree-dump-times reassoc1 "_[0-9]+ & 32;"
 10

There are only 8 instances of the pattern in the dump (attached).

According to gcc-testresults, there are also failures on
powerpc64le-unknown-linux-gnu,
aarch64-unknown-linux-gnu, and ia64-suse-linux-gnu.

  Rainer