#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 */
struct stat {
  int st_size;
};
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char const *, char *);
int /*<<< orphan*/ fputc(char, int /*<<< orphan*/ *);
scalar_t__ stat(char const *, struct stat *);
void wipefile(char const *aFilename) {
  int i;
  struct stat st;
  FILE *lIn;
  if (stat(aFilename, &st) == 0) {
    if ((lIn = fopen(aFilename, "w"))) {
      for (i = 0; i < st.st_size; i++) {
        fputc('A', lIn);
      }
      fclose(lIn);
    }
  }
}


x86 assembly (clang, -O0):
<wipefile>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
lea    -0x10(%rbp),%rsi
call   1050 <stat@plt>
cmp    $0x0,%rax
jne    11be <wipefile+0x7e>
mov    -0x8(%rbp),%rdi
lea    0xe92(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmp    $0x0,%rax
je     11b9 <wipefile+0x79>
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x10(%rbp),%eax
jge    11b0 <wipefile+0x70>
mov    -0x18(%rbp),%rsi
mov    $0x41,%edi
call   1040 <fputc@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1188 <wipefile+0x48>
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
jmp    11be <wipefile+0x7e>
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<wipefile>:
push   %rbp
push   %rbx
push   %rax
mov    %rdi,%rbx
mov    %rsp,%rsi
call   1050 <stat@plt>
test   %rax,%rax
jne    119d <wipefile+0x5d>
lea    0xea6(%rip),%rsi
mov    %rbx,%rdi
call   1060 <fopen@plt>
test   %rax,%rax
je     119d <wipefile+0x5d>
mov    %rax,%rbx
cmpl   $0x0,(%rsp)
jle    1195 <wipefile+0x55>
xor    %ebp,%ebp
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
mov    $0x41,%edi
mov    %rbx,%rsi
call   1040 <fputc@plt>
add    $0x1,%ebp
cmp    (%rsp),%ebp
jl     1180 <wipefile+0x40>
mov    %rbx,%rdi
call   1030 <fclose@plt>
add    $0x8,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
%struct.stat = type { i32 }
@.str = [2 x i8] c"w\00"
define void @wipefile(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca %struct.stat
%5 = alloca i32*
store i8* %0, i8** %2
%6 = load i8*, i8** %2
%7 = call i64 @stat(i8* %6, %struct.stat* %4)
%8 = icmp eq i64 %7, 0
br i1 %8, label %9, label %29
9: ; preds = %1
%10 = load i8*, i8** %2
%11 = call i32* @fopen(i8* %10, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %11, i32** %5
%12 = icmp ne i32* %11, null
br i1 %12, label %13, label %28
13: ; preds = %9
store i32 0, i32* %3
br label %14
14: ; preds = %22, %13
%15 = load i32, i32* %3
%16 = getelementptr inbounds %struct.stat, %struct.stat* %4, i32 0, i32 0
%17 = load i32, i32* %16
%18 = icmp slt i32 %15, %17
br i1 %18, label %19, label %25
19: ; preds = %14
%20 = load i32*, i32** %5
%21 = call i32 @fputc(i8 signext 65, i32* %20)
br label %22
22: ; preds = %19
%23 = load i32, i32* %3
%24 = add nsw i32 %23, 1
store i32 %24, i32* %3
br label %14
25: ; preds = %14
%26 = load i32*, i32** %5
%27 = call i32 @fclose(i32* %26)
br label %28
28: ; preds = %25, %9
br label %29
29: ; preds = %28, %1
ret void
}

LLVM IR (-O2):
%struct.stat = type { i32 }
@.str = [2 x i8] c"w\00"
define void @wipefile(i8* %0) {
%2 = alloca %struct.stat
%3 = bitcast %struct.stat* %2 to i8*
%4 = call i64 @stat(i8* %0, %struct.stat* %2)
%5 = icmp eq i64 %4, 0
br i1 %5, label %6, label %21
6: ; preds = %1
%7 = call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%8 = icmp eq i32* %7, null
br i1 %8, label %21, label %9
9: ; preds = %6
%10 = getelementptr inbounds %struct.stat, %struct.stat* %2, i64 0, i32 0
%11 = load i32, i32* %10
%12 = icmp sgt i32 %11, 0
br i1 %12, label %13, label %19
13: ; preds = %9, %13
%14 = phi i32 [ %16, %13 ], [ 0, %9 ]
%15 = call i32 @fputc(i8 signext 65, i32* %7)
%16 = add nuw nsw i32 %14, 1
%17 = load i32, i32* %10
%18 = icmp slt i32 %16, %17
br i1 %18, label %13, label %19
19: ; preds = %13, %9
%20 = call i32 @fclose(i32* %7)
br label %21
21: ; preds = %6, %19, %1
ret void
}