#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*/ isdigit(char const);
int isIntegerConstant(const char *string) {
  int index;
  for (index = 0; string[index] != '\0'; ++index)
    if (!isdigit(string[index]))
      return 0;
  return 1;
}


x86 assembly (clang, -O0):
<isIntegerConstant>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0x0,%eax
je     1171 <isIntegerConstant+0x61>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%edi
call   1030 <isdigit@plt>
cmp    $0x0,%eax
jne    115e <isIntegerConstant+0x4e>
movl   $0x0,-0x4(%rbp)
jmp    1178 <isIntegerConstant+0x68>
jmp    1163 <isIntegerConstant+0x53>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1123 <isIntegerConstant+0x13>
movl   $0x1,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<isIntegerConstant>:
push   %rbp
push   %rbx
push   %rax
mov    (%rdi),%al
mov    $0x1,%ebp
test   %al,%al
je     114b <isIntegerConstant+0x3b>
mov    %rdi,%rbx
add    $0x1,%rbx
cs nopw 0x0(%rax,%rax,1)
nop
movsbl %al,%edi
call   1030 <isdigit@plt>
test   %eax,%eax
je     1149 <isIntegerConstant+0x39>
movzbl (%rbx),%eax
add    $0x1,%rbx
test   %al,%al
jne    1130 <isIntegerConstant+0x20>
jmp    114b <isIntegerConstant+0x3b>
xor    %ebp,%ebp
mov    %ebp,%eax
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
define i32 @isIntegerConstant(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 = %23, %1
%6 = load i8*, i8** %3
%7 = load i32, i32* %4
%8 = sext i32 %7 to i64
%9 = getelementptr inbounds i8, i8* %6, i64 %8
%10 = load i8, i8* %9
%11 = sext i8 %10 to i32
%12 = icmp ne i32 %11, 0
br i1 %12, label %13, label %26
13: ; preds = %5
%14 = load i8*, i8** %3
%15 = load i32, i32* %4
%16 = sext i32 %15 to i64
%17 = getelementptr inbounds i8, i8* %14, i64 %16
%18 = load i8, i8* %17
%19 = call i32 @isdigit(i8 signext %18)
%20 = icmp ne i32 %19, 0
br i1 %20, label %22, label %21
21: ; preds = %13
store i32 0, i32* %2
br label %27
22: ; preds = %13
br label %23
23: ; preds = %22
%24 = load i32, i32* %4
%25 = add nsw i32 %24, 1
store i32 %25, i32* %4
br label %5
26: ; preds = %5
store i32 1, i32* %2
br label %27
27: ; preds = %26, %21
%28 = load i32, i32* %2
ret i32 %28
}

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