[llvm-bugs] [Bug 45718] New: Failure to merge loops with identi

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45718

            Bug ID: 45718
           Summary: Failure to merge loops with identi
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

void f(int *__restrict a, int *__restrict b, size_t sz)
{
    for (int i = 0; i < sz; ++i)
        a[i] += b[i];

    for (int i = 0; i < sz; ++i)
        a[i] += b[i];
}

These two loops could be merged into a single one doing two additions per
iteration. ICC does this transformation, LLVM does not.

See also https://godbolt.org/z/YnCPNA

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