#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 /*<<< orphan*/ snprintf(char *, int, char *, unsigned int);
char *hex_digest(const unsigned char *u) {
  static char hex[33] = {0};
  const unsigned char *p;
  char *q;
  for (p = u, q = hex; p < u + 16; ++p, q += 2)
    snprintf(q, 3, "%02x", (unsigned int)*p);
  return hex;
}


x86 assembly (clang, -O0):
<hex_digest>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x10(%rbp)
lea    0x2f15(%rip),%rax
mov    %rax,-0x18(%rbp)
mov    -0x10(%rbp),%rax
mov    -0x8(%rbp),%rcx
add    $0x10,%rcx
cmp    %rcx,%rax
jae    117d <hex_digest+0x6d>
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rax
movzbl (%rax),%ecx
mov    $0x3,%esi
lea    0xea5(%rip),%rdx
call   1030 <snprintf@plt>
mov    -0x10(%rbp),%rax
add    $0x1,%rax
mov    %rax,-0x10(%rbp)
mov    -0x18(%rbp),%rax
add    $0x2,%rax
mov    %rax,-0x18(%rbp)
jmp    112f <hex_digest+0x1f>
lea    0x2ebc(%rip),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<hex_digest>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%rbx
movzbl (%rdi),%ecx
lea    0x2f1e(%rip),%r14
lea    0xed7(%rip),%r15
mov    %r14,%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x1(%rbx),%ecx
lea    0x2efe(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x2(%rbx),%ecx
lea    0x2ee8(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x3(%rbx),%ecx
lea    0x2ed2(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x4(%rbx),%ecx
lea    0x2ebc(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x5(%rbx),%ecx
lea    0x2ea6(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x6(%rbx),%ecx
lea    0x2e90(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x7(%rbx),%ecx
lea    0x2e7a(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x8(%rbx),%ecx
lea    0x2e64(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0x9(%rbx),%ecx
lea    0x2e4e(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0xa(%rbx),%ecx
lea    0x2e38(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0xb(%rbx),%ecx
lea    0x2e22(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0xc(%rbx),%ecx
lea    0x2e0c(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0xd(%rbx),%ecx
lea    0x2df6(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0xe(%rbx),%ecx
lea    0x2de0(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
movzbl 0xf(%rbx),%ecx
lea    0x2dca(%rip),%rdi
mov    $0x3,%esi
mov    %r15,%rdx
call   1030 <snprintf@plt>
mov    %r14,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@hex_digest.hex = internal global [33 x i8] zeroinitializer
@.str = [5 x i8] c"%02x\00"
define i8* @hex_digest(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i8*
store i8* %0, i8** %2
%5 = load i8*, i8** %2
store i8* %5, i8** %3
store i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 0), i8** %4
br label %6
6: ; preds = %17, %1
%7 = load i8*, i8** %3
%8 = load i8*, i8** %2
%9 = getelementptr inbounds i8, i8* %8, i64 16
%10 = icmp ult i8* %7, %9
br i1 %10, label %11, label %22
11: ; preds = %6
%12 = load i8*, i8** %4
%13 = load i8*, i8** %3
%14 = load i8, i8* %13
%15 = zext i8 %14 to i32
%16 = call i32 @snprintf(i8* %12, i32 3, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %15)
br label %17
17: ; preds = %11
%18 = load i8*, i8** %3
%19 = getelementptr inbounds i8, i8* %18, i32 1
store i8* %19, i8** %3
%20 = load i8*, i8** %4
%21 = getelementptr inbounds i8, i8* %20, i64 2
store i8* %21, i8** %4
br label %6
22: ; preds = %6
ret i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 0)
}

LLVM IR (-O2):
@hex_digest.hex = internal global [33 x i8] zeroinitializer
@.str = [5 x i8] c"%02x\00"
define i8* @hex_digest(i8* nocapture %0) {
%2 = load i8, i8* %0
%3 = zext i8 %2 to i32
%4 = tail call i32 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 0), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 2), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 4), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 6), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 8), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 10), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 12), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 14), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 16), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 18), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 20), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 22), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 24), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 26), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 28), i32 3, i8* 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 @snprintf(i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 30), i32 3, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i32 %63)
ret i8* getelementptr inbounds ([33 x i8], [33 x i8]* @hex_digest.hex, i64 0, i64 0)
}