From c5fcf7179a83ef65c86c6a4a390029149e518649 Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Tue, 5 Oct 2021 21:49:54 +0200
Subject: Duzy commit ze smieciami

---
 semestr-4/ask/lista5/zad3.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 semestr-4/ask/lista5/zad3.c

(limited to 'semestr-4/ask/lista5/zad3.c')

diff --git a/semestr-4/ask/lista5/zad3.c b/semestr-4/ask/lista5/zad3.c
new file mode 100644
index 0000000..1ce9067
--- /dev/null
+++ b/semestr-4/ask/lista5/zad3.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+uint32_t puzzle3(uint32_t n, uint32_t d);
+
+// uint32_t divv(uint32_t edi, uint32_t esi) {
+//     uint64_t rdi = edi;
+//     uint64_t rsi = esi;
+//     rsi <<= 32;
+//     uint8_t edx = 32;
+//     uint32_t ecx = 0x80000000;
+//     uint32_t eax = 0;
+// L3:
+//     rdi += rdi;
+//     int64_t r8 = rdi;
+//     r8 -= rsi;
+//     if (r8 < 0) {
+//         goto L2;
+//     }
+//     eax |= ecx;
+//     rdi = r8;
+// L2:
+//     ecx >>= 1;
+//     edx--;
+//     if (edx != 0) {
+//         goto L3;
+//     }
+//     return eax;
+// }
+
+uint32_t decoded(uint32_t n, uint32_t d) {
+    uint64_t N = n;
+    uint64_t D = (uint64_t)d << 32;
+
+    uint32_t bit = 0x80000000;
+    uint32_t result = 0;
+    for (uint32_t edx = 32; edx > 0; edx--) {
+        N += N;
+        if ((int64_t)(N - D) >= 0) {
+            result |= bit;
+            N -= D;
+        }
+        bit >>= 1;
+    }
+    return result;
+}
+
+int main() {
+    for (uint32_t n=0; n <= 1000; ++n) {
+        for (uint32_t d=1; d <= 1000; ++d) {
+            if (puzzle3(n,d) != decoded(n, d)) {
+                printf("%d %d\n", n, d);
+                printf("%u %u\n", puzzle3(n, d), decoded(n, d));
+                return 0;
+            }
+        }
+    }
+    printf("%d\n", puzzle3(1000000000, 2));
+}
\ No newline at end of file
-- 
cgit v1.2.3