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Fallback for non x86/x64 architectures #6

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Fallback for non x86/x64 architectures #6

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12 changes: 9 additions & 3 deletions rgb2spec.c
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Original file line number Diff line number Diff line change
Expand Up @@ -134,9 +134,15 @@ float rgb2spec_eval_precise(float coeff[RGB2SPEC_N_COEFFS], float lambda) {
}

float rgb2spec_eval_fast(float coeff[RGB2SPEC_N_COEFFS], float lambda) {
float x = rgb2spec_fma(rgb2spec_fma(coeff[0], lambda, coeff[1]), lambda, coeff[2]),
y = _mm_cvtss_f32(_mm_rsqrt_ss(_mm_set_ss(rgb2spec_fma(x, x, 1.f))));
return rgb2spec_fma(.5f * x, y, .5f);
#if defined(__x86_64__)
float x = rgb2spec_fma(rgb2spec_fma(coeff[0], lambda, coeff[1]), lambda, coeff[2]),
y = _mm_cvtss_f32(_mm_rsqrt_ss(_mm_set_ss(rgb2spec_fma(x, x, 1.f))));
return rgb2spec_fma(.5f * x, y, .5f);
#else
// Fallback for other architectures:
return rgb2spec_eval_precise(coeff, lambda);
#endif

}

#if defined(__SSE4_2__)
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5 changes: 4 additions & 1 deletion rgb2spec.h
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@@ -1,7 +1,10 @@
#pragma once

#include <stdint.h>
#include <immintrin.h>

#if defined(__x86_64__)
#include <immintrin.h>
#endif

#ifdef __cplusplus
extern "C"
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