#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int gcd(int, int);
int /*<<< orphan*/ printf(char *, int, int, int);
int main() {
  for (int i = 2; i < 20; ++i) {
    for (int j = 2; j < 20; ++j) {
      printf("gcd(%d, %d) = %d\n", i, j, gcd(i, j));
    }
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x2,-0x8(%rbp)
cmpl   $0x14,-0x8(%rbp)
jge    119d <main+0x7d>
movl   $0x2,-0xc(%rbp)
cmpl   $0x14,-0xc(%rbp)
jge    118a <main+0x6a>
mov    -0x8(%rbp),%eax
mov    %eax,-0x14(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
mov    -0x8(%rbp),%edi
mov    -0xc(%rbp),%esi
call   1040 <gcd@plt>
mov    -0x14(%rbp),%esi
mov    -0x10(%rbp),%edx
mov    %eax,%ecx
lea    0xe89(%rip),%rdi
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1147 <main+0x27>
jmp    118f <main+0x6f>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1136 <main+0x16>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r14
push   %rbx
mov    $0x2,%ebx
lea    0xed0(%rip),%r14
mov    $0x2,%ebp
cs nopw 0x0(%rax,%rax,1)
nop
mov    %ebx,%edi
mov    %ebp,%esi
call   1040 <gcd@plt>
mov    %r14,%rdi
mov    %ebx,%esi
mov    %ebp,%edx
mov    %eax,%ecx
call   1030 <printf@plt>
add    $0x1,%ebp
cmp    $0x14,%ebp
jne    1140 <main+0x20>
add    $0x1,%ebx
cmp    $0x14,%ebx
jne    1130 <main+0x10>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
@.str = [18 x i8] c"gcd(%d, %d) = %d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
store i32 0, i32* %1
store i32 2, i32* %2
br label %4
4: ; preds = %22, %0
%5 = load i32, i32* %2
%6 = icmp slt i32 %5, 20
br i1 %6, label %7, label %25
7: ; preds = %4
store i32 2, i32* %3
br label %8
8: ; preds = %18, %7
%9 = load i32, i32* %3
%10 = icmp slt i32 %9, 20
br i1 %10, label %11, label %21
11: ; preds = %8
%12 = load i32, i32* %2
%13 = load i32, i32* %3
%14 = load i32, i32* %2
%15 = load i32, i32* %3
%16 = call i32 @gcd(i32 %14, i32 %15)
%17 = call i32 @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0), i32 %12, i32 %13, i32 %16)
br label %18
18: ; preds = %11
%19 = load i32, i32* %3
%20 = add nsw i32 %19, 1
store i32 %20, i32* %3
br label %8
21: ; preds = %8
br label %22
22: ; preds = %21
%23 = load i32, i32* %2
%24 = add nsw i32 %23, 1
store i32 %24, i32* %2
br label %4
25: ; preds = %4
ret i32 0
}

LLVM IR (-O2):
@.str = [18 x i8] c"gcd(%d, %d) = %d\0A\00"
define i32 @main() {
br label %1
1: ; preds = %0, %4
%2 = phi i32 [ 2, %0 ], [ %5, %4 ]
br label %7
3: ; preds = %4
ret i32 0
4: ; preds = %7
%5 = add nuw nsw i32 %2, 1
%6 = icmp eq i32 %5, 20
br i1 %6, label %3, label %1
7: ; preds = %1, %7
%8 = phi i32 [ 2, %1 ], [ %11, %7 ]
%9 = tail call i32 @gcd(i32 %2, i32 %8)
%10 = tail call i32 @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0), i32 %2, i32 %8, i32 %9)
%11 = add nuw nsw i32 %8, 1
%12 = icmp eq i32 %11, 20
br i1 %12, label %4, label %7
}