#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 cgc_strlen(char const *);
int /*<<< orphan*/ isalnum(char const);
int is_alphanum(const char *s) {
  int i;
  for (i = 0; i < cgc_strlen(s) - 1; ++i) {
    if (!isalnum(s[i]))
      return 0;
  }
  return 1;
}


x86 assembly (clang, -O0):
<is_alphanum>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x14(%rbp),%eax
mov    %eax,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <cgc_strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%eax
sub    $0x1,%ecx
cmp    %ecx,%eax
jge    118b <is_alphanum+0x6b>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1030 <isalnum@plt>
cmp    $0x0,%eax
jne    1178 <is_alphanum+0x58>
movl   $0x0,-0x4(%rbp)
jmp    1192 <is_alphanum+0x72>
jmp    117d <is_alphanum+0x5d>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1133 <is_alphanum+0x13>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<is_alphanum>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%rbx
call   1040 <cgc_strlen@plt>
mov    $0x1,%r14d
cmp    $0x2,%eax
jl     1168 <is_alphanum+0x48>
xor    %ebp,%ebp
nopl   0x0(%rax)
movsbl (%rbx,%rbp,1),%edi
call   1030 <isalnum@plt>
test   %eax,%eax
je     1165 <is_alphanum+0x45>
add    $0x1,%rbp
mov    %rbx,%rdi
call   1040 <cgc_strlen@plt>
add    $0xffffffff,%eax
cltq
cmp    %rax,%rbp
jl     1140 <is_alphanum+0x20>
jmp    1168 <is_alphanum+0x48>
xor    %r14d,%r14d
mov    %r14d,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
define i32 @is_alphanum(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32
store i8* %0, i8** %3
store i32 0, i32* %4
br label %5
5: ; preds = %21, %1
%6 = load i32, i32* %4
%7 = load i8*, i8** %3
%8 = call i32 @cgc_strlen(i8* %7)
%9 = sub nsw i32 %8, 1
%10 = icmp slt i32 %6, %9
br i1 %10, label %11, label %24
11: ; preds = %5
%12 = load i8*, i8** %3
%13 = load i32, i32* %4
%14 = sext i32 %13 to i64
%15 = getelementptr inbounds i8, i8* %12, i64 %14
%16 = load i8, i8* %15
%17 = call i32 @isalnum(i8 signext %16)
%18 = icmp ne i32 %17, 0
br i1 %18, label %20, label %19
19: ; preds = %11
store i32 0, i32* %2
br label %25
20: ; preds = %11
br label %21
21: ; preds = %20
%22 = load i32, i32* %4
%23 = add nsw i32 %22, 1
store i32 %23, i32* %4
br label %5
24: ; preds = %5
store i32 1, i32* %2
br label %25
25: ; preds = %24, %19
%26 = load i32, i32* %2
ret i32 %26
}

LLVM IR (-O2):
define i32 @is_alphanum(i8* %0) {
%2 = tail call i32 @cgc_strlen(i8* %0)
%3 = icmp sgt i32 %2, 1
br i1 %3, label %9, label %16
4: ; preds = %9
%5 = tail call i32 @cgc_strlen(i8* %0)
%6 = add nsw i32 %5, -1
%7 = sext i32 %6 to i64
%8 = icmp slt i64 %15, %7
br i1 %8, label %9, label %16
9: ; preds = %1, %4
%10 = phi i64 [ %15, %4 ], [ 0, %1 ]
%11 = getelementptr inbounds i8, i8* %0, i64 %10
%12 = load i8, i8* %11
%13 = tail call i32 @isalnum(i8 signext %12)
%14 = icmp eq i32 %13, 0
%15 = add nuw nsw i64 %10, 1
br i1 %14, label %16, label %4
16: ; preds = %9, %4, %1
%17 = phi i32 [ 1, %1 ], [ 1, %4 ], [ 0, %9 ]
ret i32 %17
}