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vrsqrte_f32
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 Arm 64-bit (64 bits)/ NEON  View official documentation
 Location: Math Functions  >  Vector Approximate Reciprocal Square Root
 Supported Architectures: v7, A32, A64
Purpose:

Floating-point Reciprocal Square Root Estimate. This instruction calculates an approximate square root for each vector element in the source SIMD&FP register, places the result in a vector, and writes the vector to the destination SIMD&FP register.

Result:

float32x2_t

Example:
#include <arm_neon.h>
#include <stdio.h>
int main() {
 float32x2_t a = {
  4.0f, 9.0f
 };
 float32x2_t result = vrsqrte_f32(a);
 float out[2];
 vst1_f32(out, result);
 for (int i = 0; i < 2; i++) {
   printf("%f ", out[i]);
  }
  printf("\n");

  return 0;
 }

Prototypes

Assembly Instruction:
FRSQRTE
Usage:
float32x2_t result = vrsqrte_f32( float32x2_t 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