I experienced crashes running an old code of mine on a system which doesn't support SSE4.1, I debugged a bit and found SSE instructions in the glibc, is that possible? Why isn't this reported in gcc 4.8.1 release notes?
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You can see what optimizations are used by GCC with the following command:
For instance, on my machine, GCC does not enable sse4.1 by default:
However, it is supported because it appears in
/proc/cpuinfo
. And indeed, if I ask GCC to optimize the generated code for my machine, it enables sse4.1: