[LLVMbugs] [Bug 17681] New: [Vectorizer] Recognize memory stride access

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17681

            Bug ID: 17681
           Summary: [Vectorizer] Recognize memory stride access
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: renato.golin at linaro.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

After implementing interleaved and non-interleaved non-unit stride access on
the vectorizer, make sure that cases where a pointer is used to access the
induction is mapped into a semantics we do understand.

Basically, making this:

for (i..N/3) {
 a++ = b++ + K;
 a++ = b++ + K;
 a++ = b++ + K;
}

Look like this:

for (i..N/3) {
 a[3*i] = b[3*i] + K;
 a[3*i+1] = b[3*i+1] + K;
 a[3*i+2] = b[3*i+2] + K;
}

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