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sycl: fix UE4M3 parsing #25608

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Merged
ggerganov merged 1 commit into from
Aug 7, 2026
Merged

sycl: fix UE4M3 parsing #25608

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17 changes: 14 additions & 3 deletions ggml/src/ggml-sycl/common.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1019,9 +1019,20 @@ static T block_reduce(T val, T * shared_vals, int block_size_template) {
}

static __dpct_inline__ float ggml_sycl_ue4m3_to_fp32(uint8_t x) {
const uint32_t bits = x * (x != 0x7F && x != 0xFF);
const __nv_fp8_e4m3 xf = *reinterpret_cast<const __nv_fp8_e4m3 *>(&bits);
return static_cast<float>(xf) / 2;
// UE4M3 is unsigned: 4 exp bits (bias 7), 3 mantissa bits, no sign, no NaN.
// exp == 0xF is a valid exponent (256-448 range), not NaN.
if (x == 0 || x == 0x7F) {
return 0.0f;
}
const int exp = (x >> 3) & 0xF;
const int man = x & 0x7;
float raw;
if (exp == 0) {
raw = man * (1.0f / 8.0f) * sycl::pow(2.0f, -6.0f);
} else {
raw = (1.0f + man / 8.0f) * sycl::pow(2.0f, (float) exp - 7.0f);
}
return raw * 0.5f;
}

#endif // GGML_SYCL_COMMON_HPP
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