原始版本

RT_Thread/libcpu/ia32/__umodsi3.c

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+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-10-09     Bernard      the first version for i386
+ */
+
+#include <stdint.h>
+
+uint32_t __umodsi3(uint32_t num, uint32_t den)
+{
+    register uint32_t quot = 0, qbit = 1;
+
+    if (den == 0)
+    {
+        asm volatile ("int $0");
+        return 0;   /* if trap returns... */
+    }
+
+    /* left-justify denominator and count shift */
+    while ((int32_t) den >= 0)
+    {
+        den <<= 1;
+        qbit <<= 1;
+    }
+
+    while (qbit)
+    {
+        if (den <= num)
+        {
+            num -= den;
+            quot += qbit;
+        }
+        den >>= 1;
+        qbit >>= 1;
+    }
+
+    return num;
+}