[Bug tree-optimization/64434] New: Performance regression after operand canonicalization (r216728).

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64434

            Bug ID: 64434
           Summary: Performance regression after operand canonicalization
                    (r216728).
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ysrumyan at gmail dot com

We noticed huge regression on eembc1.1 and eembc2.0 for 32-bit target at x86.
It can be reproduced on attached test-case:

before this fix number of %esp references in assembly was 2 but after r216728 -
24. Note that simple fix resolving this issue was sent for review.