#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 timeval {
  int tv_sec;
  scalar_t__ tv_usec;
};
typedef int /*<<< orphan*/ fd_set;

/* Variables and functions */
int /*<<< orphan*/ FD_SET(int, int /*<<< orphan*/ *);
int /*<<< orphan*/ FD_ZERO(int /*<<< orphan*/ *);
int select(int, int /*<<< orphan*/ *, int /*<<< orphan*/, int /*<<< orphan*/,
           struct timeval *);
int serial_ready(int fd, int wait) {
  fd_set lfdvar;
  int ready;
  struct timeval timeout;
  FD_ZERO(&lfdvar);
  FD_SET(fd, &lfdvar);
  timeout.tv_sec = wait;
  timeout.tv_usec = 0;
  ready = select(fd + 1, &lfdvar, 0, 0, &timeout);
  return (ready);
}


x86 assembly (clang, -O0):
<serial_ready>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %esi,-0x8(%rbp)
lea    -0xc(%rbp),%rdi
call   1030 <FD_ZERO@plt>
mov    -0x4(%rbp),%edi
lea    -0xc(%rbp),%rsi
call   1050 <FD_SET@plt>
mov    -0x8(%rbp),%eax
mov    %eax,-0x20(%rbp)
movq   $0x0,-0x18(%rbp)
mov    -0x4(%rbp),%edi
add    $0x1,%edi
lea    -0xc(%rbp),%rsi
xor    %ecx,%ecx
lea    -0x20(%rbp),%r8
mov    %ecx,%edx
call   1040 <select@plt>
mov    %eax,-0x10(%rbp)
mov    -0x10(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<serial_ready>:
push   %rbp
push   %r14
push   %rbx
sub    $0x20,%rsp
mov    %esi,%ebx
mov    %edi,%ebp
lea    0xc(%rsp),%r14
mov    %r14,%rdi
call   1030 <FD_ZERO@plt>
mov    %ebp,%edi
mov    %r14,%rsi
call   1050 <FD_SET@plt>
mov    %ebx,0x10(%rsp)
movq   $0x0,0x18(%rsp)
add    $0x1,%ebp
lea    0x10(%rsp),%r8
mov    %ebp,%edi
mov    %r14,%rsi
xor    %edx,%edx
xor    %ecx,%ecx
call   1040 <select@plt>
add    $0x20,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
%struct.timeval = type { i32, i64 }
define i32 @serial_ready(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
%7 = alloca %struct.timeval
store i32 %0, i32* %3
store i32 %1, i32* %4
%8 = call i32 @FD_ZERO(i32* %5)
%9 = load i32, i32* %3
%10 = call i32 @FD_SET(i32 %9, i32* %5)
%11 = load i32, i32* %4
%12 = getelementptr inbounds %struct.timeval, %struct.timeval* %7, i32 0, i32 0
store i32 %11, i32* %12
%13 = getelementptr inbounds %struct.timeval, %struct.timeval* %7, i32 0, i32 1
store i64 0, i64* %13
%14 = load i32, i32* %3
%15 = add nsw i32 %14, 1
%16 = call i32 @select(i32 %15, i32* %5, i32 0, i32 0, %struct.timeval* %7)
store i32 %16, i32* %6
%17 = load i32, i32* %6
ret i32 %17
}

LLVM IR (-O2):
%struct.timeval = type { i32, i64 }
define i32 @serial_ready(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca %struct.timeval
%5 = bitcast i32* %3 to i8*
%6 = bitcast %struct.timeval* %4 to i8*
%7 = call i32 @FD_ZERO(i32* %3)
%8 = call i32 @FD_SET(i32 %0, i32* %3)
%9 = getelementptr inbounds %struct.timeval, %struct.timeval* %4, i64 0, i32 0
store i32 %1, i32* %9
%10 = getelementptr inbounds %struct.timeval, %struct.timeval* %4, i64 0, i32 1
store i64 0, i64* %10
%11 = add nsw i32 %0, 1
%12 = call i32 @select(i32 %11, i32* %3, i32 0, i32 0, %struct.timeval* %4)
ret i32 %12
}