#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 termios {
  int *c_cc;
  int /*<<< orphan*/ c_lflag;
};

/* Variables and functions */
int /*<<< orphan*/ ECHO;
int /*<<< orphan*/ ICANON;
int /*<<< orphan*/ TCSANOW;
size_t VMIN;
int /*<<< orphan*/ tcgetattr(int /*<<< orphan*/, struct termios *);
int /*<<< orphan*/ tcsetattr(int /*<<< orphan*/, int /*<<< orphan*/,
                             struct termios *);
extern void set_cr_noecho_mode(void) {
  struct termios ttystate;
  tcgetattr(0, &ttystate);
  ttystate.c_lflag &= ~ICANON;
  ttystate.c_lflag &= ~ECHO;
  ttystate.c_cc[VMIN] = 1;
  tcsetattr(0, TCSANOW, &ttystate);
}


x86 assembly (clang, -O0):
<set_cr_noecho_mode>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
xor    %edi,%edi
lea    -0x10(%rbp),%rsi
call   1030 <tcgetattr@plt>
mov    0x2e8e(%rip),%rax
mov    (%rax),%eax
xor    $0xffffffff,%eax
and    -0x8(%rbp),%eax
mov    %eax,-0x8(%rbp)
mov    0x2e94(%rip),%rax
mov    (%rax),%eax
xor    $0xffffffff,%eax
and    -0x8(%rbp),%eax
mov    %eax,-0x8(%rbp)
mov    -0x10(%rbp),%rax
mov    0x2e76(%rip),%rcx
mov    (%rcx),%rcx
movl   $0x1,(%rax,%rcx,4)
mov    0x2e75(%rip),%rax
mov    (%rax),%esi
xor    %edi,%edi
lea    -0x10(%rbp),%rdx
call   1040 <tcsetattr@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<set_cr_noecho_mode>:
push   %rbx
sub    $0x10,%rsp
mov    %rsp,%rbx
xor    %edi,%edi
mov    %rbx,%rsi
call   1030 <tcgetattr@plt>
mov    0x2e8f(%rip),%rax
mov    (%rax),%eax
mov    0x2e9e(%rip),%rcx
or     (%rcx),%eax
not    %eax
and    %eax,0x8(%rsp)
mov    (%rsp),%rax
mov    0x2e83(%rip),%rcx
mov    (%rcx),%rcx
movl   $0x1,(%rax,%rcx,4)
mov    0x2e82(%rip),%rax
mov    (%rax),%esi
xor    %edi,%edi
mov    %rbx,%rdx
call   1040 <tcsetattr@plt>
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
%struct.termios = type { i32*, i32 }
@ICANON = global i32 0
@ECHO = global i32 0
@VMIN = global i64 0
@TCSANOW = global i32 0
define void @set_cr_noecho_mode() {
%1 = alloca %struct.termios
%2 = call i32 @tcgetattr(i32 0, %struct.termios* %1)
%3 = load i32, i32* @ICANON
%4 = xor i32 %3, -1
%5 = getelementptr inbounds %struct.termios, %struct.termios* %1, i32 0, i32 1
%6 = load i32, i32* %5
%7 = and i32 %6, %4
store i32 %7, i32* %5
%8 = load i32, i32* @ECHO
%9 = xor i32 %8, -1
%10 = getelementptr inbounds %struct.termios, %struct.termios* %1, i32 0, i32 1
%11 = load i32, i32* %10
%12 = and i32 %11, %9
store i32 %12, i32* %10
%13 = getelementptr inbounds %struct.termios, %struct.termios* %1, i32 0, i32 0
%14 = load i32*, i32** %13
%15 = load i64, i64* @VMIN
%16 = getelementptr inbounds i32, i32* %14, i64 %15
store i32 1, i32* %16
%17 = load i32, i32* @TCSANOW
%18 = call i32 @tcsetattr(i32 0, i32 %17, %struct.termios* %1)
ret void
}

LLVM IR (-O2):
%struct.termios = type { i32*, i32 }
@ICANON = global i32 0
@ECHO = global i32 0
@VMIN = global i64 0
@TCSANOW = global i32 0
define void @set_cr_noecho_mode() {
%1 = alloca %struct.termios
%2 = bitcast %struct.termios* %1 to i8*
%3 = call i32 @tcgetattr(i32 0, %struct.termios* %1)
%4 = load i32, i32* @ICANON
%5 = getelementptr inbounds %struct.termios, %struct.termios* %1, i64 0, i32 1
%6 = load i32, i32* %5
%7 = load i32, i32* @ECHO
%8 = or i32 %4, %7
%9 = xor i32 %8, -1
%10 = and i32 %6, %9
store i32 %10, i32* %5
%11 = getelementptr inbounds %struct.termios, %struct.termios* %1, i64 0, i32 0
%12 = load i32*, i32** %11
%13 = load i64, i64* @VMIN
%14 = getelementptr inbounds i32, i32* %12, i64 %13
store i32 1, i32* %14
%15 = load i32, i32* @TCSANOW
%16 = call i32 @tcsetattr(i32 0, i32 %15, %struct.termios* %1)
ret void
}