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Loop Fusion Some adjacent loops can be fused into one loop to reduce loop overhead and improve run-time performance. Example: The two adjacent loops on the code fragment below can be fused into on loop. for (i = 0; i < 300; i++) a[i] = a[i] + 3; for (i = 0; i < 300; i++) b[i] = b[i] + 4; Below is the code fragment after loop fusion. for (i = 0; i < 300; i++) { a[i] = a[i] + 3; b[i] = b[i] + 4; } Notes: Loop fusion is not commonly supported by C compilers. Although loop fusion reduces loop overhead, it does not always improve run-time performance, and may reduce run-time performance. For example, the memory architecture may provide better performance if two arrays are initialized in separate loops, rather than initializing both arrays simultaneously in one loop. © 1990-2012 Nullstone Corporation. All Rights Reserved.