_mm256_rsqrt_psADD TO COMPARE ADDED TO COMPARE
Intel 64-bit (64 bits)/ AVX2
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View Félix Cloutier's documentation
Purpose:
Compute the approximate reciprocal square root of packed single-precision (32-bit) floating-point elements in a, and store the results in output. The maximum relative error for this approximation is less than 1.5*2^-12.
Result:
__m256
Example:
#include <immintrin.h>
#include <stdio.h>
int main() {
float values[8] = {
4.0f, 9.0f, 16.0f, 25.0f, 36.0f, 49.0f, 64.0f, 81.0f
};
__m256 a = _mm256_loadu_ps(values);
__m256 result = _mm256_rsqrt_ps(a);
float out[8];
_mm256_storeu_ps(out, result);
for (int i = 0; i < 8; i++) {
printf("%f ", out[i]);
}
printf("\n");
return 0;
}Prototypes
Assembly Instruction:
vrsqrtps
Usage:
__m256 result =
_mm256_rsqrt_ps(
__m256 a
)
Performance Metrics:
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SIMD Intrinsics Summary
| SIMD Engines: | 6 |
| C Intrinsics: | 10444 |
| NEON: | 4353 |
| AVX2: | 405 |
| AVX512: | 4717 |
| SSE4.2: | 598 |
| VSX: | 192 |
| IBM-Z: | 179 |