In its current state, the operation a[i] += b[i] expands to a[i] += a[i+1], which is fully parallelizable in incremental order of iteration. With this change, it instead expands to a[i] += a[i-1], which requires sequential execution.
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…= a[i+1]`, which is fully parallelizable in incremental order of iteration. With this change, it instead expands to `a[i] += a[i-1]`, which requires sequential execution.
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