#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 strlen(char *);
int str_termlf(char *line) {
  int i;
  for (i = 0; i < strlen(line); i++) {
    if (line[i] == '\n') {
      line[i] = 0;
      return i;
    }
  }
  return 0;
}


x86 assembly (clang, -O0):
<str_termlf>:
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   1030 <strlen@plt>
mov    %eax,%ecx
mov    -0x18(%rbp),%eax
cmp    %ecx,%eax
jge    117e <str_termlf+0x6e>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movsbl (%rax,%rcx,1),%eax
cmp    $0xa,%eax
jne    116b <str_termlf+0x5b>
mov    -0x10(%rbp),%rax
movslq -0x14(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    1185 <str_termlf+0x75>
jmp    1170 <str_termlf+0x60>
mov    -0x14(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x14(%rbp)
jmp    1123 <str_termlf+0x13>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<str_termlf>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
call   1030 <strlen@plt>
test   %eax,%eax
jle    114a <str_termlf+0x3a>
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax)
cmpb   $0xa,(%r14,%rbx,1)
je     114e <str_termlf+0x3e>
add    $0x1,%rbx
mov    %r14,%rdi
call   1030 <strlen@plt>
cltq
cmp    %rax,%rbx
jl     1130 <str_termlf+0x20>
xor    %ebx,%ebx
jmp    1153 <str_termlf+0x43>
movb   $0x0,(%r14,%rbx,1)
mov    %ebx,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define i32 @str_termlf(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 = %25, %1
%6 = load i32, i32* %4
%7 = load i8*, i8** %3
%8 = call i32 @strlen(i8* %7)
%9 = icmp slt i32 %6, %8
br i1 %9, label %10, label %28
10: ; preds = %5
%11 = load i8*, i8** %3
%12 = load i32, i32* %4
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds i8, i8* %11, i64 %13
%15 = load i8, i8* %14
%16 = sext i8 %15 to i32
%17 = icmp eq i32 %16, 10
br i1 %17, label %18, label %24
18: ; preds = %10
%19 = load i8*, i8** %3
%20 = load i32, i32* %4
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds i8, i8* %19, i64 %21
store i8 0, i8* %22
%23 = load i32, i32* %4
store i32 %23, i32* %2
br label %29
24: ; preds = %10
br label %25
25: ; preds = %24
%26 = load i32, i32* %4
%27 = add nsw i32 %26, 1
store i32 %27, i32* %4
br label %5
28: ; preds = %5
store i32 0, i32* %2
br label %29
29: ; preds = %28, %18
%30 = load i32, i32* %2
ret i32 %30
}

LLVM IR (-O2):
define i32 @str_termlf(i8* %0) {
%2 = tail call i32 @strlen(i8* %0)
%3 = icmp sgt i32 %2, 0
br i1 %3, label %4, label %18
4: ; preds = %1, %13
%5 = phi i64 [ %14, %13 ], [ 0, %1 ]
%6 = getelementptr inbounds i8, i8* %0, i64 %5
%7 = load i8, i8* %6
%8 = icmp eq i8 %7, 10
br i1 %8, label %9, label %13
9: ; preds = %4
%10 = trunc i64 %5 to i32
%11 = and i64 %5, 4294967295
%12 = getelementptr inbounds i8, i8* %0, i64 %11
store i8 0, i8* %12
br label %18
13: ; preds = %4
%14 = add nuw nsw i64 %5, 1
%15 = tail call i32 @strlen(i8* %0)
%16 = sext i32 %15 to i64
%17 = icmp slt i64 %14, %16
br i1 %17, label %4, label %18
18: ; preds = %13, %1, %9
%19 = phi i32 [ %10, %9 ], [ 0, %1 ], [ 0, %13 ]
ret i32 %19
}