sse3

SSE instruction set not enabled

由 谁说我不能喝 提交于 2019-11-29 13:31:00
问题 I am getting trouble with this error: "SSE instruction set not enabled" . How I can figure this out? I have ACER i7, Ubuntu 11.10, please any one can help me? Any help will be appreciated! Also running: sudo cat /proc/cpuinfo | grep flags Gives: flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clfl ush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx rdtscp lm constant_tsc arch_perfm on pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est

Sum reduction of unsigned bytes without overflow, using SSE2 on Intel

由 泪湿孤枕 提交于 2019-11-27 05:34:24
I am trying to find sum reduction of 32 elements (each 1 byte data) on an Intel i3 processor. I did this: s=0; for (i=0; i<32; i++) { s = s + a[i]; } However, its taking more time, since my application is a real-time application requiring much lesser time. Please note that the final sum could be more than 255. Is there a way I can implement this using low level SIMD SSE2 instructions? Unfortunately I have never used SSE. I tried searching for sse2 function for this purpose, but it is also not available. Is it (sse) guaranteed to reduce the computation time for such a small-sized problems? Any
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