void MDPrint(digest) unsigned char digest[16];
{
  unsigned int i;
  for (i = 0; i < 16; i++)
    printf("%02x", digest[i]);
}


x86 assembly (clang, -O0):
<MDPrint>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
movl   $0x0,-0xc(%rbp)
cmpl   $0x10,-0xc(%rbp)
jae    1154 <MDPrint+0x44>
mov    -0x8(%rbp),%rax
mov    -0xc(%rbp),%ecx
movzbl (%rax,%rcx,1),%esi
lea    0xec1(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1123 <MDPrint+0x13>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<MDPrint>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%rbx
movzbl (%rdi),%esi
lea    0xedf(%rip),%r14
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x1(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x2(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x3(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x4(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x5(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x6(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x7(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x8(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0x9(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0xa(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0xb(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0xc(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0xd(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0xe(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
call   1030 <printf@plt>
movzbl 0xf(%rbx),%esi
mov    %r14,%rdi
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
jmp    1030 <printf@plt>

LLVM IR (-O0):
@.str = [5 x i8] c"%02x\00"
define void @MDPrint(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
store i8* %0, i8** %2
store i32 0, i32* %3
br label %4
4: ; preds = %15, %1
%5 = load i32, i32* %3
%6 = icmp ult i32 %5, 16
br i1 %6, label %7, label %18
7: ; preds = %4
%8 = load i8*, i8** %2
%9 = load i32, i32* %3
%10 = zext i32 %9 to i64
%11 = getelementptr inbounds i8, i8* %8, i64 %10
%12 = load i8, i8* %11
%13 = zext i8 %12 to i32
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %13)
br label %15
15: ; preds = %7
%16 = load i32, i32* %3
%17 = add i32 %16, 1
store i32 %17, i32* %3
br label %4
18: ; preds = %4
ret void
}

LLVM IR (-O2):
@.str = [5 x i8] c"%02x\00"
define void @MDPrint(i8* nocapture %0) {
%2 = load i8, i8* %0
%3 = zext i8 %2 to i32
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %3)
%5 = getelementptr inbounds i8, i8* %0, i64 1
%6 = load i8, i8* %5
%7 = zext i8 %6 to i32
%8 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %7)
%9 = getelementptr inbounds i8, i8* %0, i64 2
%10 = load i8, i8* %9
%11 = zext i8 %10 to i32
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %11)
%13 = getelementptr inbounds i8, i8* %0, i64 3
%14 = load i8, i8* %13
%15 = zext i8 %14 to i32
%16 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %15)
%17 = getelementptr inbounds i8, i8* %0, i64 4
%18 = load i8, i8* %17
%19 = zext i8 %18 to i32
%20 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %19)
%21 = getelementptr inbounds i8, i8* %0, i64 5
%22 = load i8, i8* %21
%23 = zext i8 %22 to i32
%24 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %23)
%25 = getelementptr inbounds i8, i8* %0, i64 6
%26 = load i8, i8* %25
%27 = zext i8 %26 to i32
%28 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %27)
%29 = getelementptr inbounds i8, i8* %0, i64 7
%30 = load i8, i8* %29
%31 = zext i8 %30 to i32
%32 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %31)
%33 = getelementptr inbounds i8, i8* %0, i64 8
%34 = load i8, i8* %33
%35 = zext i8 %34 to i32
%36 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %35)
%37 = getelementptr inbounds i8, i8* %0, i64 9
%38 = load i8, i8* %37
%39 = zext i8 %38 to i32
%40 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %39)
%41 = getelementptr inbounds i8, i8* %0, i64 10
%42 = load i8, i8* %41
%43 = zext i8 %42 to i32
%44 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %43)
%45 = getelementptr inbounds i8, i8* %0, i64 11
%46 = load i8, i8* %45
%47 = zext i8 %46 to i32
%48 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %47)
%49 = getelementptr inbounds i8, i8* %0, i64 12
%50 = load i8, i8* %49
%51 = zext i8 %50 to i32
%52 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %51)
%53 = getelementptr inbounds i8, i8* %0, i64 13
%54 = load i8, i8* %53
%55 = zext i8 %54 to i32
%56 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %55)
%57 = getelementptr inbounds i8, i8* %0, i64 14
%58 = load i8, i8* %57
%59 = zext i8 %58 to i32
%60 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %59)
%61 = getelementptr inbounds i8, i8* %0, i64 15
%62 = load i8, i8* %61
%63 = zext i8 %62 to i32
%64 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %63)
ret void
}