import upstream maccel baseline

2026-03-24 12:10:31 +00:00
parent 6e948d7b39
commit 5f1254d11a
108 changed files with 18930 additions and 0 deletions
@@ -0,0 +1,75 @@
+#include <linux/types.h>
+
+#ifndef __KERNEL__
+#include <stdint.h>
+#endif // !__KERNEL__
+
+/**
+ * [Yeetmouse](https://github.com/AndyFilter/YeetMouse/blob/master/driver/FixedMath/Fixed64.h#L1360)
+ * has better string utils. FP64_ToString there doesn't require
+ * `__udivmodti4` in 64-bit mode.
+ *
+ */
+
+typedef int32_t FP_INT;
+typedef int64_t FP_LONG;
+
+#define FP64_Shift 32
+
+static inline FP_LONG FP64_Mul(FP_LONG a, FP_LONG b) {
+  return (FP_LONG)(((__int128_t)a * (__int128_t)b) >> FP64_Shift);
+}
+
+static char *FP_64_itoa_loop(char *buf, uint64_t scale, uint64_t value,
+                             int skip) {
+  while (scale) {
+    unsigned digit = (value / scale);
+
+    if (!skip || digit || scale == 1) {
+      skip = 0;
+      *buf++ = '0' + digit;
+      value %= scale;
+    }
+
+    scale /= 10;
+  }
+  return buf;
+}
+
+void FP64_ToString(FP_LONG value, char *buf);
+
+void FP64_ToString(FP_LONG value, char *buf) {
+  uint64_t uvalue = (value >= 0) ? value : -value;
+  if (value < 0)
+    *buf++ = '-';
+
+#define SCALE 9
+
+  static const uint64_t FP_64_scales[10] = {
+      /* 18 decimals is enough for full 64bit fixed point precision */
+      1,      10,      100,      1000,      10000,
+      100000, 1000000, 10000000, 100000000, 1000000000};
+
+  /* Separate the integer and decimal parts of the value */
+  uint64_t intpart = uvalue >> 32;
+  uint64_t fracpart = uvalue & 0xFFFFFFFF;
+  uint64_t scale = FP_64_scales[SCALE];
+  fracpart = FP64_Mul(fracpart, scale);
+
+  if (fracpart >= scale) {
+    /* Handle carry from decimal part */
+    intpart++;
+    fracpart -= scale;
+  }
+
+  /* Format integer part */
+  buf = FP_64_itoa_loop(buf, 1000000000, intpart, 1);
+
+  /* Format decimal part (if any) */
+  if (scale != 1) {
+    *buf++ = '.';
+    buf = FP_64_itoa_loop(buf, scale / 10, fracpart, 0);
+  }
+
+  *buf = '\0';
+}