[llvm-bugs] [Bug 47562] New: loop unroll pass missed on simple code

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47562

            Bug ID: 47562
           Summary: loop unroll pass missed on simple code
           Product: new-bugs
           Version: 10.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: bique.alexandre at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 23975
  --> https://bugs.llvm.org/attachment.cgi?id=23975&action=edit
missed-unroll.cc

Hi,

Here is a trivial example and loop unroll failed.


20-09-17 17:59:02 abique at knot:~/t/clang> clang -O3 -c missed-unroll.cc 
missed-unroll.cc:8:6: warning: loop not unrolled: the optimizer was unable to
perform the requested transformation; the transformation might be disabled or
specified as part of an unsupported transformation ordering
[-Wpass-failed=transform-warning]
void fct_FAIL(float * __restrict__ a, float * __restrict__ b, float *
__restrict__ c, unsigned len)
     ^
1 warning generated.
20-09-17 17:59:05 abique at knot:~/t/clang> 



Regards,
Alexandre

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