[LLVMbugs] [Bug 17680] New: [Vectorizer] Recognize reduction stride vectorization

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17680

            Bug ID: 17680
           Summary: [Vectorizer] Recognize reduction stride vectorization
           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 stride access is added to the vectorizer, and interleaved and
non-interleaved access is implemented, make sure that reductions also work with
the non-unit stride induction. Example:

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

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