Hi Zuxy, There is a check made to see if the hardware supports prefetch if so then the -fprefetch-loop-arrays flags is ignored. In many other architectures this is still quite useful. But currently I think the prefetch flag is always set to 0 in "loop.c". Regards, Praveen On 4/27/07, Zuxy Meng <zuxy.meng@xxxxxxxxx> wrote:
Hi, Modern x86/x86-64 CPUs support hardware prefetch if memory loads are in a regular pattern, and software prefetch is recommended only when memory access pattern is hard to determine by hardware. Does that mean -fprefetch-loop-arrays is unnecessary on such CPUs? -- Zuxy
