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rsqrt from 0
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#include <stdio.h> #include <xmmintrin.h> int main(void) { float x = 0.0f; __m128 x4 = _mm_set_ss(x); __m128 r4 = _mm_mul_ss(x4, _mm_rsqrt_ss(x4)); float r = _mm_cvtss_f32(r4); printf("%f\n", r); return 0; }
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Compilation time: 0.12 sec, absolute running time: 0.13 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,26 sec
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-nan