void ailog_matrix(char *campo, int alt, int larg) {
  int x, y;
  for (y = 0; y < alt; y++) {
    for (x = 0; x < larg; x++) {
      if (campo[(((y) * (larg)) + (x))])
        ailog("X");
      else
        ailog("_");
    }
    ailog("\n");
  }
  ailog("\n");
}


x86 assembly (clang, -O0):
<ailog_matrix>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %esi,-0xc(%rbp)
mov    %edx,-0x10(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    11b3 <ailog_matrix+0xa3>
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
cmp    -0x10(%rbp),%eax
jge    1197 <ailog_matrix+0x87>
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%ecx
imul   -0x10(%rbp),%ecx
add    -0x14(%rbp),%ecx
movslq %ecx,%rcx
cmpb   $0x0,(%rax,%rcx,1)
je     1176 <ailog_matrix+0x66>
lea    0xe96(%rip),%rdi
mov    $0x0,%al
call   1030 <ailog@plt>
jmp    1184 <ailog_matrix+0x74>
lea    0xe85(%rip),%rdi
mov    $0x0,%al
call   1030 <ailog@plt>
jmp    1189 <ailog_matrix+0x79>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    113c <ailog_matrix+0x2c>
lea    0xe66(%rip),%rdi
mov    $0x0,%al
call   1030 <ailog@plt>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    1129 <ailog_matrix+0x19>
lea    0xe4a(%rip),%rdi
mov    $0x0,%al
call   1030 <ailog@plt>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<ailog_matrix>:
push   %rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x18,%rsp
mov    %edx,0x4(%rsp)
test   %esi,%esi
jle    119f <ailog_matrix+0x8f>
mov    %rdi,%rbx
movslq 0x4(%rsp),%rax
mov    %esi,%ecx
mov    %rcx,0x8(%rsp)
mov    %rax,0x10(%rsp)
mov    %eax,%ebp
lea    0xebf(%rip),%r14
lea    0xeb6(%rip),%r15
xor    %r12d,%r12d
jmp    116e <ailog_matrix+0x5e>
nop
lea    0xead(%rip),%rdi
xor    %eax,%eax
call   1030 <ailog@plt>
add    $0x1,%r12
add    0x10(%rsp),%rbx
cmp    0x8(%rsp),%r12
je     119f <ailog_matrix+0x8f>
cmpl   $0x0,0x4(%rsp)
jle    1150 <ailog_matrix+0x40>
xor    %r13d,%r13d
jmp    1190 <ailog_matrix+0x80>
nopw   0x0(%rax,%rax,1)
xor    %eax,%eax
call   1030 <ailog@plt>
add    $0x1,%r13
cmp    %r13,%rbp
je     1150 <ailog_matrix+0x40>
cmpb   $0x0,(%rbx,%r13,1)
mov    %r14,%rdi
je     1180 <ailog_matrix+0x70>
mov    %r15,%rdi
jmp    1180 <ailog_matrix+0x70>
lea    0xe5e(%rip),%rdi
xor    %eax,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
jmp    1030 <ailog@plt>

LLVM IR (-O0):
@.str = [2 x i8] c"X\00"
@.str.1 = [2 x i8] c"_\00"
@.str.2 = [2 x i8] c"\0A\00"
define void @ailog_matrix(i8* %0, i32 %1, i32 %2) {
%4 = alloca i8*
%5 = alloca i32
%6 = alloca i32
%7 = alloca i32
%8 = alloca i32
store i8* %0, i8** %4
store i32 %1, i32* %5
store i32 %2, i32* %6
store i32 0, i32* %8
br label %9
9: ; preds = %39, %3
%10 = load i32, i32* %8
%11 = load i32, i32* %5
%12 = icmp slt i32 %10, %11
br i1 %12, label %13, label %42
13: ; preds = %9
store i32 0, i32* %7
br label %14
14: ; preds = %34, %13
%15 = load i32, i32* %7
%16 = load i32, i32* %6
%17 = icmp slt i32 %15, %16
br i1 %17, label %18, label %37
18: ; preds = %14
%19 = load i8*, i8** %4
%20 = load i32, i32* %8
%21 = load i32, i32* %6
%22 = mul nsw i32 %20, %21
%23 = load i32, i32* %7
%24 = add nsw i32 %22, %23
%25 = sext i32 %24 to i64
%26 = getelementptr inbounds i8, i8* %19, i64 %25
%27 = load i8, i8* %26
%28 = icmp ne i8 %27, 0
br i1 %28, label %29, label %31
29: ; preds = %18
%30 = call i32 (i8*, ...) bitcast (i32 (...)* @ailog to i32 (i8*, ...)*)(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
br label %33
31: ; preds = %18
%32 = call i32 (i8*, ...) bitcast (i32 (...)* @ailog to i32 (i8*, ...)*)(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
br label %33
33: ; preds = %31, %29
br label %34
34: ; preds = %33
%35 = load i32, i32* %7
%36 = add nsw i32 %35, 1
store i32 %36, i32* %7
br label %14
37: ; preds = %14
%38 = call i32 (i8*, ...) bitcast (i32 (...)* @ailog to i32 (i8*, ...)*)(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
br label %39
39: ; preds = %37
%40 = load i32, i32* %8
%41 = add nsw i32 %40, 1
store i32 %41, i32* %8
br label %9
42: ; preds = %9
%43 = call i32 (i8*, ...) bitcast (i32 (...)* @ailog to i32 (i8*, ...)*)(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str = [2 x i8] c"X\00"
@.str.1 = [2 x i8] c"_\00"
@.str.2 = [2 x i8] c"\0A\00"
define void @ailog_matrix(i8* nocapture %0, i32 %1, i32 %2) {
%4 = icmp sgt i32 %1, 0
br i1 %4, label %5, label %28
5: ; preds = %3
%6 = icmp sgt i32 %2, 0
%7 = sext i32 %2 to i64
%8 = zext i32 %1 to i64
%9 = zext i32 %2 to i64
br label %10
10: ; preds = %5, %24
%11 = phi i64 [ 0, %5 ], [ %26, %24 ]
br i1 %6, label %12, label %24
12: ; preds = %10
%13 = mul nsw i64 %11, %7
br label %14
14: ; preds = %12, %14
%15 = phi i64 [ 0, %12 ], [ %22, %14 ]
%16 = add nsw i64 %15, %13
%17 = getelementptr inbounds i8, i8* %0, i64 %16
%18 = load i8, i8* %17
%19 = icmp eq i8 %18, 0
%20 = select i1 %19, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0)
%21 = tail call i32 (i8*, ...) bitcast (i32 (...)* @ailog to i32 (i8*, ...)*)(i8* %20)
%22 = add nuw nsw i64 %15, 1
%23 = icmp eq i64 %22, %9
br i1 %23, label %24, label %14
24: ; preds = %14, %10
%25 = tail call i32 (i8*, ...) bitcast (i32 (...)* @ailog to i32 (i8*, ...)*)(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
%26 = add nuw nsw i64 %11, 1
%27 = icmp eq i64 %26, %8
br i1 %27, label %28, label %10
28: ; preds = %24, %3
%29 = tail call i32 (i8*, ...) bitcast (i32 (...)* @ailog to i32 (i8*, ...)*)(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.2, i64 0, i64 0))
ret void
}