asm

asm/idiv.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+int main() {
+	short a, b, c, d;
+	scanf("%hd %hd", &a, &b);
+	asm
+		(			
+		 	"mov %1,%%ax\n"
+			"mov %2,%%bx\n"
+		 	"cwd\n"
+			"idiv %%bx\n"
+			"mov %%ax, %%dx\n"
+			"mov %%dx, %0\n"
+			: "=r" (c)
+			: "r" (a), "r" (b)
+		);
+	printf("%hd\n", c);
+}
+
+

asm/solutions.md

@@ -0,0 +1,153 @@
+# zero
+
+```
+xor %eax, %eax
+```
+
+# one
+```
+xor %eax, %eax
+inc %eax
+```
+
+# next
+```
+inc %ax
+```
+
+# prev
+```
+dec %ax
+```
+
+# sum
+```
+mov %ax, %dx
+add %bx, %dx
+```
+
+# sub
+```
+mov %rax, %rdx
+sub %rbx, %rdx
+```
+
+# imul
+```
+imul %bl
+mov %ax, %dx
+```
+
+# idiv
+```
+cwd
+idiv %bx
+mov %ax, %dx 
+```
+
+# lea
+```
+lea (%rax, %rbx, 8), %rdx
+```
+
+# lea1
+```
+lea (%rax, %rax, 4), %rdx
+```
+
+# lea32
+```
+lea (%eax, %ebx, 8), %edx
+```
+
+# egalite
+```
+cmp %ax, %bx
+jne nya
+mov $1, %dx
+jmp nya_
+nya:
+mov $0, %dx
+nya_:
+```
+
+# factorial
+```
+xor %edx, %edx
+inc %edx
+cmp $0, %al
+je end
+mov %al, %cl
+mov %ecx, %eax
+loop:
+cmp $1, %ecx
+mov %eax, %edx
+jle end
+dec %ecx
+mul %ecx
+jmp loop
+end:
+```
+
+# factorial64
+```
+xor %rdx, %rdx
+inc %rdx
+cmp $0, %al
+je end
+mov %al, %cl
+mov %rcx, %rax
+loop:
+cmp $1, %rcx
+mov %rax, %rdx
+jle end
+dec %rcx
+mul %rcx
+jmp loop
+end:
+```
+# antifa
+```
+xor %ecx, %ecx
+inc %ecx
+loop:
+cmp $1, %eax
+je end
+inc %ecx
+cdq
+div %ecx
+jmp loop
+end:
+mov %ecx, %ebx
+```
+
+# antifa64
+```
+xor %rcx, %rcx
+inc %rcx
+loop:
+cmp $1, %rax
+je end
+inc %rcx
+cqo
+div %rcx
+jmp loop
+end:
+mov %rcx, %rbx
+```
+
+# vector
+```
+xor %rbx, %rbx
+cmp $0, %rcx
+je end
+dec %rcx
+loop:
+lea (%rax, %rcx, 8), %rdx
+add (%rdx), %rbx
+dec %rcx
+cmp $-1, %rcx
+je end
+jmp loop
+end:
+```

asm/vector.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdint.h>
+
+int main() {
+	//uint64_t c = 5;
+	uint64_t b, c = 5;
+	int64_t *a;
+	int64_t array[] = {1, 2, 3, 4, 5};
+	a = array;
+	//printf("pointer: %p\n", a);
+	asm (
+		"mov %1, %%rax\n"
+		"mov %2, %%rcx\n"
+
+		"xor %%rbx, %%rbx\n"
+		"cmp $0, %%rcx\n"
+		"je end\n"
+		
+		"dec %%rcx\n"
+
+		"loop:\n"
+
+		"lea (%%rax, %%rcx, 8), %%rdx\n"
+		"add (%%rdx), %%rbx\n"
+		"dec %%rcx\n"
+
+		"cmp $-1, %%rcx\n"
+		"je end\n"
+		"jmp loop\n"
+
+		"end:\n"
+
+
+		"mov %%rbx, %0\n"
+		: "=r" (b)
+		: "r" (a), "r" (c)
+	    );
+	printf("%lld\n", b);
+
+}