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fix #2701

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Merged
awni merged 1 commit into from
Oct 23, 2025
Merged

fix #2701

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13 changes: 13 additions & 0 deletions mlx/backend/cuda/quantized/cuda_fp4.h
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Original file line number Diff line number Diff line change
@@ -1,5 +1,18 @@
#pragma once

struct __nv_fp8_e8m0 {
__device__ __nv_fp8_e8m0(uint8_t x) : __x(x) {}

__device__ operator float() {
if (__x == 0xFF) {
return std::numeric_limits<float>::quiet_NaN();
}
return std::ldexp(1.0f, static_cast<int>(__x) - 127);
}

uint8_t __x{0};
};

struct __nv_fp4_e2m1 {
__device__ __nv_fp4_e2m1(float x) {
if (std::isnan(x)) {
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