import

2026-05-19 11:49:22 +08:00
commit add7af4222
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+#ifndef INCLUDED_IEEE_FLOAT_H
+#define INCLUDED_IEEE_FLOAT_H
+
+#ifndef INCLUDED_STDINT_H
+#define INCLUDED_STDINT_H
+#include <stdint.h>
+#endif /*INCLUDED_STDINT_H*/
+
+#ifndef INCLUDED_FLOAT_H
+#define INCLUDED_FLOAT_H
+#include <float.h>
+#endif /*INCLUDED_FLOAT_H*/
+
+#ifndef INCLUDED_STDBOOL_H
+#define INCLUDED_STDBOOL_H
+#include <stdbool.h>
+#endif /*INCLUDED_STDBOOL_H*/
+
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+typedef struct {
+    union{
+        struct{
+            uint32_t sign:1;
+            uint32_t exponent:8;
+            uint32_t mantissa:23;
+        }IEEE754;
+        uint32_t uint;
+        float f;
+    }value;
+}ieee_float_t;
+
+typedef struct {
+    union{
+        struct{
+            uint64_t sign:1;
+            uint64_t exponent:11;
+            uint64_t mantissa:52;
+        }IEEE754;
+        uint64_t uint;
+        double f;
+    }value;
+}ieee_double_t;
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+#define IEEE_FLOAT_POSITIVE_INFINITY    (1.0f/0.0f)
+#define IEEE_FLOAT_NEGATIVE_INFINITY    (-1.0f/0.0f)
+#define IEEE_FLOAT_NAN                  (0.0f/0.0f)
+
+#define IEEE_FLOAT_EPSILON              (FLT_EPSILON)
+#define IEEE_DOUBLE_EPSILON             (DBL_EPSILON)
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+int ieee_float_cmp(const float a, const float b, const float maxDiff);
+int ieee_double_cmp(const double a, const double b, const double maxDiff);
+
+// 当将 float 看作 uint32 时进行比较，maxUlpsDiff 就是作为无符号整数允许的最大差异,一般取 `1` 就可以
+// maxFloatDiff 一般取 IEEE_FLOAT_EPSILON, 是将数值作为 float 进行比较，但是如果两个 float 无法完成比较，就可以通过
+// 无符号整数的形式来进行比较
+int ieee_float_UlpsCmp(const float a, const float b, const float maxFloatDiff, const int maxUlpsDiff);
+int ieee_double_UlpsCmp(const double a, const double b, const double maxFloatDiff, const int maxUlpsDiff);
+
+bool ieee_float_is_zero(const float a, const float maxDiff);
+bool ieee_double_is_zero(const double a, const double maxDiff);
+
+#endif /*INCLUDED_IEEE_FLOAT_H*/