push

libc/include/math.h

@@ -0,0 +1,62 @@
+#ifndef _MATH_H
+#define _MATH_H
+
+#include <stdint.h>
+
+int abs(int x);
+double fabs(double x);
+double pow(double base, double exp);
+double pow10(int n);
+int isinf(double x);
+int isnan(double x);
+
+static inline double floor(double x) {
+    int64_t i = (int64_t)x;
+    return (double)(i - (x < (double)i));
+}
+
+static inline double ceil(double x) {
+    int64_t i = (int64_t)x;
+    return (double)(i + (x > (double)i));
+}
+
+static inline double round(double x) {
+    return (x >= 0.0) ? floor(x + 0.5) : ceil(x - 0.5);
+}
+
+static inline double sqrt(double x) {
+    double result;
+    asm volatile ("sqrtsd %1, %0" : "=x"(result) : "x"(x));
+    return result;
+}
+
+static inline float sqrtf(float x) {
+    float result;
+    asm volatile ("sqrtss %1, %0" : "=x"(result) : "x"(x));
+    return result;
+}
+
+static inline double log2(double x) {
+    double result;
+    asm volatile (
+        "fld1\n\t"
+        "fld  %1\n\t"
+        "fyl2x\n\t"
+        "fstp %0\n\t"
+        : "=m"(result) : "m"(x)
+    );
+    return result;
+}
+
+#define MIN(a, b) ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a < _b ? _a : _b; })
+#define MAX(a, b) ({ __typeof__(a) _a = (a); __typeof__(b) _b = (b); _a > _b ? _a : _b; })
+
+#define ALIGN_UP(x, align)   (((x) + (align) - 1) & ~((align) - 1))
+#define ALIGN_DOWN(x, align) ((x) & ~((align) - 1))
+
+#define IS_POWER_OF_TWO(x) ((x) != 0 && (((x) & ((x) - 1)) == 0))
+
+#define INFINITY (1.0/0.0)
+#define NAN (0.0/0.0)
+
+#endif