https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64432

--- Comment #9 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> ---
reading the standard, indeed it seems like count_rate can be real as well...
same rules here *4 -> _4 *8 -> _8.

As a side remark the following generates a slightly outdated error:

> cat test.f90
COMPLEX(KIND=4) :: count_rate
CALL SYSTEM_CLOCK(count_rate=count_rate)
END

> gfortran test.f90
test.f90:2:29:

 CALL SYSTEM_CLOCK(count_rate=count_rate)
                             1
Error: ‘count_rate’ argument of ‘system_clock’ intrinsic at (1) must be INTEGER

should be 'INTEGER or REAL'.

count and count_max are still integer.
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Subject: [Bug tree-optimization/64434] [5 Regression] Performance regression after operand canonicalization (r216728).
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd434

--- Comment #11 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Created attachment 34363
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id4363&actioníit
patch to fix issue

This patch fixed almost all issues related to operand canonicalization.