#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*/ sprintf(char *, char *, unsigned char);
void buf2hex(char *dst, unsigned char *src, int src_len) {
  for (int i = 0; i < src_len; ++i) {
    sprintf(dst + (i * 2), "%.2x", src[i]);
  }
}


x86 assembly (clang, -O0):
<buf2hex>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %edx,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    116b <buf2hex+0x5b>
mov    -0x8(%rbp),%rdi
mov    -0x18(%rbp),%eax
shl    $0x1,%eax
cltq
add    %rax,%rdi
mov    -0x10(%rbp),%rax
movslq -0x18(%rbp),%rcx
lea    0xeac(%rip),%rsi
movzbl (%rax,%rcx,1),%edx
call   1030 <sprintf@plt>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    112a <buf2hex+0x1a>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<buf2hex>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
test   %edx,%edx
jle    114d <buf2hex+0x3d>
mov    %rsi,%r14
mov    %rdi,%r13
mov    %edx,%r12d
xor    %ebx,%ebx
lea    0xed1(%rip),%r15
nop
movzbl (%r14,%rbx,1),%edx
mov    %r13,%rdi
mov    %r15,%rsi
call   1030 <sprintf@plt>
add    $0x1,%rbx
add    $0x2,%r13
cmp    %rbx,%r12
jne    1130 <buf2hex+0x20>
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [5 x i8] c"%.2x\00"
define void @buf2hex(i8* %0, i8* %1, i32 %2) {
%4 = alloca i8*
%5 = alloca i8*
%6 = alloca i32
%7 = alloca i32
store i8* %0, i8** %4
store i8* %1, i8** %5
store i32 %2, i32* %6
store i32 0, i32* %7
br label %8
8: ; preds = %24, %3
%9 = load i32, i32* %7
%10 = load i32, i32* %6
%11 = icmp slt i32 %9, %10
br i1 %11, label %12, label %27
12: ; preds = %8
%13 = load i8*, i8** %4
%14 = load i32, i32* %7
%15 = mul nsw i32 %14, 2
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds i8, i8* %13, i64 %16
%18 = load i8*, i8** %5
%19 = load i32, i32* %7
%20 = sext i32 %19 to i64
%21 = getelementptr inbounds i8, i8* %18, i64 %20
%22 = load i8, i8* %21
%23 = call i32 @sprintf(i8* %17, i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8 zeroext %22)
br label %24
24: ; preds = %12
%25 = load i32, i32* %7
%26 = add nsw i32 %25, 1
store i32 %26, i32* %7
br label %8
27: ; preds = %8
ret void
}

LLVM IR (-O2):
@.str = [5 x i8] c"%.2x\00"
define void @buf2hex(i8* nocapture writeonly %0, i8* nocapture %1, i32 %2) {
%4 = icmp sgt i32 %2, 0
br i1 %4, label %5, label %7
5: ; preds = %3
%6 = zext i32 %2 to i64
br label %8
7: ; preds = %8, %3
ret void
8: ; preds = %5, %8
%9 = phi i64 [ 0, %5 ], [ %15, %8 ]
%10 = shl nuw nsw i64 %9, 1
%11 = getelementptr inbounds i8, i8* %0, i64 %10
%12 = getelementptr inbounds i8, i8* %1, i64 %9
%13 = load i8, i8* %12
%14 = tail call i32 @sprintf(i8* dereferenceable(1) %11, i8* dereferenceable(1) getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8 zeroext %13)
%15 = add nuw nsw i64 %9, 1
%16 = icmp eq i64 %15, %6
br i1 %16, label %7, label %8
}