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diff --git a/include/fp16/fp16.h b/include/fp16/fp16.h
index 2b61fff..1947805 100644
--- a/include/fp16/fp16.h
+++ b/include/fp16/fp16.h
@@ -4,10 +4,8 @@
#if defined(__cplusplus) && (__cplusplus >= 201103L)
#include <cstdint>
- #include <cmath>
#elif !defined(__OPENCL_VERSION__)
#include <stdint.h>
- #include <math.h>
#endif
#ifdef _MSC_VER
@@ -228,9 +226,11 @@ static inline uint16_t fp16_ieee_from_fp32_value(float f) {
const float scale_to_inf = fp32_from_bits(UINT32_C(0x77800000));
const float scale_to_zero = fp32_from_bits(UINT32_C(0x08800000));
#endif
- float base = (fabsf(f) * scale_to_inf) * scale_to_zero;
-
const uint32_t w = fp32_to_bits(f);
+ const float abs_f = fp32_from_bits(w & UINT32_C(0x7FFFFFFF));
+
+ float base = (abs_f * scale_to_inf) * scale_to_zero;
+
const uint32_t shl1_w = w + w;
const uint32_t sign = w & UINT32_C(0x80000000);
uint32_t bias = shl1_w & UINT32_C(0xFF000000);
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