#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 */
unsigned int strlen(char *);
char *truncnl(char *str) {
  unsigned c;
  c = strlen(str);
  while (c && (str[c - 1] == '\r' || str[c - 1] == '\n'))
    c--;
  str[c] = 0;
  return (str);
}


x86 assembly (clang, -O0):
<truncnl>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rdi
call   1030 <strlen@plt>
mov    %eax,-0xc(%rbp)
xor    %eax,%eax
cmpl   $0x0,-0xc(%rbp)
mov    %al,-0xd(%rbp)
je     1174 <truncnl+0x64>
mov    -0x8(%rbp),%rax
mov    -0xc(%rbp),%ecx
sub    $0x1,%ecx
mov    %ecx,%ecx
movsbl (%rax,%rcx,1),%ecx
mov    $0x1,%al
cmp    $0xd,%ecx
mov    %al,-0xe(%rbp)
je     116e <truncnl+0x5e>
mov    -0x8(%rbp),%rax
mov    -0xc(%rbp),%ecx
sub    $0x1,%ecx
mov    %ecx,%ecx
movsbl (%rax,%rcx,1),%eax
cmp    $0xa,%eax
sete   %al
mov    %al,-0xe(%rbp)
mov    -0xe(%rbp),%al
mov    %al,-0xd(%rbp)
mov    -0xd(%rbp),%al
test   $0x1,%al
jne    1184 <truncnl+0x74>
jmp    1192 <truncnl+0x82>
mov    -0xc(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0xc(%rbp)
jmp    1128 <truncnl+0x18>
mov    -0x8(%rbp),%rax
mov    -0xc(%rbp),%ecx
movb   $0x0,(%rax,%rcx,1)
mov    -0x8(%rbp),%rax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<truncnl>:
push   %rbx
mov    %rdi,%rbx
call   1030 <strlen@plt>
test   %eax,%eax
je     114b <truncnl+0x3b>
mov    %eax,%ecx
add    $0xffffffff,%eax
add    %rbx,%rax
jmp    113c <truncnl+0x2c>
nopw   0x0(%rax,%rax,1)
add    $0xffffffffffffffff,%rcx
add    $0xffffffffffffffff,%rax
test   %ecx,%ecx
je     114b <truncnl+0x3b>
movzbl (%rax),%edx
cmp    $0xd,%dl
je     1130 <truncnl+0x20>
cmp    $0xa,%dl
je     1130 <truncnl+0x20>
jmp    114d <truncnl+0x3d>
xor    %ecx,%ecx
mov    %ecx,%eax
movb   $0x0,(%rbx,%rax,1)
mov    %rbx,%rax
pop    %rbx
ret

LLVM IR (-O0):
define i8* @truncnl(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
store i8* %0, i8** %2
%4 = load i8*, i8** %2
%5 = call i32 @strlen(i8* %4)
store i32 %5, i32* %3
br label %6
6: ; preds = %31, %1
%7 = load i32, i32* %3
%8 = icmp ne i32 %7, 0
br i1 %8, label %9, label %29
9: ; preds = %6
%10 = load i8*, i8** %2
%11 = load i32, i32* %3
%12 = sub i32 %11, 1
%13 = zext i32 %12 to i64
%14 = getelementptr inbounds i8, i8* %10, i64 %13
%15 = load i8, i8* %14
%16 = sext i8 %15 to i32
%17 = icmp eq i32 %16, 13
br i1 %17, label %27, label %18
18: ; preds = %9
%19 = load i8*, i8** %2
%20 = load i32, i32* %3
%21 = sub i32 %20, 1
%22 = zext i32 %21 to i64
%23 = getelementptr inbounds i8, i8* %19, i64 %22
%24 = load i8, i8* %23
%25 = sext i8 %24 to i32
%26 = icmp eq i32 %25, 10
br label %27
27: ; preds = %18, %9
%28 = phi i1 [ true, %9 ], [ %26, %18 ]
br label %29
29: ; preds = %27, %6
%30 = phi i1 [ false, %6 ], [ %28, %27 ]
br i1 %30, label %31, label %34
31: ; preds = %29
%32 = load i32, i32* %3
%33 = add i32 %32, -1
store i32 %33, i32* %3
br label %6
34: ; preds = %29
%35 = load i8*, i8** %2
%36 = load i32, i32* %3
%37 = zext i32 %36 to i64
%38 = getelementptr inbounds i8, i8* %35, i64 %37
store i8 0, i8* %38
%39 = load i8*, i8** %2
ret i8* %39
}

LLVM IR (-O2):
define i8* @truncnl(i8* returned %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp eq i32 %2, 0
br i1 %3, label %15, label %4
4: ; preds = %1
%5 = zext i32 %2 to i64
br label %6
6: ; preds = %4, %12
%7 = phi i64 [ %5, %4 ], [ %8, %12 ]
%8 = add nsw i64 %7, -1
%9 = and i64 %8, 4294967295
%10 = getelementptr inbounds i8, i8* %0, i64 %9
%11 = load i8, i8* %10
switch i8 %11, label %15 [
i8 13, label %12
i8 10, label %12
]
12: ; preds = %6, %6
%13 = trunc i64 %8 to i32
%14 = icmp eq i32 %13, 0
br i1 %14, label %15, label %6
15: ; preds = %12, %6, %1
%16 = phi i64 [ 0, %1 ], [ %7, %6 ], [ 0, %12 ]
%17 = and i64 %16, 4294967295
%18 = getelementptr inbounds i8, i8* %0, i64 %17
store i8 0, i8* %18
ret i8* %0
}