#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 block {
  int dummy;
};

/* Variables and functions */
int block_child_env(struct block *);
int block_child_exec(struct block *);
int block_child_sig(struct block *);
int block_child_stderr(struct block *);
int block_child_stdin(struct block *);
int block_child_stdout(struct block *);
int block_child(struct block *block) {
  int err;
  err = block_child_env(block);
  if (err)
    return err;
  err = block_child_sig(block);
  if (err)
    return err;
  err = block_child_stdin(block);
  if (err)
    return err;
  err = block_child_stdout(block);
  if (err)
    return err;
  err = block_child_stderr(block);
  if (err)
    return err;
  return block_child_exec(block);
}


x86 assembly (clang, -O0):
<block_child>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <block_child_env@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
je     118d <block_child+0x2d>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    121d <block_child+0xbd>
mov    -0x10(%rbp),%rdi
call   1080 <block_child_sig@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
je     11ae <block_child+0x4e>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    121d <block_child+0xbd>
mov    -0x10(%rbp),%rdi
call   1050 <block_child_stdin@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
je     11cf <block_child+0x6f>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    121d <block_child+0xbd>
mov    -0x10(%rbp),%rdi
call   1070 <block_child_stdout@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
je     11f0 <block_child+0x90>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    121d <block_child+0xbd>
mov    -0x10(%rbp),%rdi
call   1060 <block_child_stderr@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
je     1211 <block_child+0xb1>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    121d <block_child+0xbd>
mov    -0x10(%rbp),%rdi
call   1030 <block_child_exec@plt>
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<block_child>:
push   %rbx
mov    %rdi,%rbx
call   1040 <block_child_env@plt>
test   %eax,%eax
jne    119d <block_child+0x3d>
mov    %rbx,%rdi
call   1080 <block_child_sig@plt>
test   %eax,%eax
jne    119d <block_child+0x3d>
mov    %rbx,%rdi
call   1050 <block_child_stdin@plt>
test   %eax,%eax
jne    119d <block_child+0x3d>
mov    %rbx,%rdi
call   1070 <block_child_stdout@plt>
test   %eax,%eax
jne    119d <block_child+0x3d>
mov    %rbx,%rdi
call   1060 <block_child_stderr@plt>
test   %eax,%eax
je     119f <block_child+0x3f>
pop    %rbx
ret
mov    %rbx,%rdi
pop    %rbx
jmp    1030 <block_child_exec@plt>

LLVM IR (-O0):
%struct.block = type { i32 }
define i32 @block_child(%struct.block* %0) {
%2 = alloca i32
%3 = alloca %struct.block*
%4 = alloca i32
store %struct.block* %0, %struct.block** %3
%5 = load %struct.block*, %struct.block** %3
%6 = call i32 @block_child_env(%struct.block* %5)
store i32 %6, i32* %4
%7 = load i32, i32* %4
%8 = icmp ne i32 %7, 0
br i1 %8, label %9, label %11
9: ; preds = %1
%10 = load i32, i32* %4
store i32 %10, i32* %2
br label %42
11: ; preds = %1
%12 = load %struct.block*, %struct.block** %3
%13 = call i32 @block_child_sig(%struct.block* %12)
store i32 %13, i32* %4
%14 = load i32, i32* %4
%15 = icmp ne i32 %14, 0
br i1 %15, label %16, label %18
16: ; preds = %11
%17 = load i32, i32* %4
store i32 %17, i32* %2
br label %42
18: ; preds = %11
%19 = load %struct.block*, %struct.block** %3
%20 = call i32 @block_child_stdin(%struct.block* %19)
store i32 %20, i32* %4
%21 = load i32, i32* %4
%22 = icmp ne i32 %21, 0
br i1 %22, label %23, label %25
23: ; preds = %18
%24 = load i32, i32* %4
store i32 %24, i32* %2
br label %42
25: ; preds = %18
%26 = load %struct.block*, %struct.block** %3
%27 = call i32 @block_child_stdout(%struct.block* %26)
store i32 %27, i32* %4
%28 = load i32, i32* %4
%29 = icmp ne i32 %28, 0
br i1 %29, label %30, label %32
30: ; preds = %25
%31 = load i32, i32* %4
store i32 %31, i32* %2
br label %42
32: ; preds = %25
%33 = load %struct.block*, %struct.block** %3
%34 = call i32 @block_child_stderr(%struct.block* %33)
store i32 %34, i32* %4
%35 = load i32, i32* %4
%36 = icmp ne i32 %35, 0
br i1 %36, label %37, label %39
37: ; preds = %32
%38 = load i32, i32* %4
store i32 %38, i32* %2
br label %42
39: ; preds = %32
%40 = load %struct.block*, %struct.block** %3
%41 = call i32 @block_child_exec(%struct.block* %40)
store i32 %41, i32* %2
br label %42
42: ; preds = %39, %37, %30, %23, %16, %9
%43 = load i32, i32* %2
ret i32 %43
}

LLVM IR (-O2):
%struct.block = type { i32 }
define i32 @block_child(%struct.block* %0) {
%2 = tail call i32 @block_child_env(%struct.block* %0)
%3 = icmp eq i32 %2, 0
br i1 %3, label %4, label %18
4: ; preds = %1
%5 = tail call i32 @block_child_sig(%struct.block* %0)
%6 = icmp eq i32 %5, 0
br i1 %6, label %7, label %18
7: ; preds = %4
%8 = tail call i32 @block_child_stdin(%struct.block* %0)
%9 = icmp eq i32 %8, 0
br i1 %9, label %10, label %18
10: ; preds = %7
%11 = tail call i32 @block_child_stdout(%struct.block* %0)
%12 = icmp eq i32 %11, 0
br i1 %12, label %13, label %18
13: ; preds = %10
%14 = tail call i32 @block_child_stderr(%struct.block* %0)
%15 = icmp eq i32 %14, 0
br i1 %15, label %16, label %18
16: ; preds = %13
%17 = tail call i32 @block_child_exec(%struct.block* %0)
br label %18
18: ; preds = %13, %10, %7, %4, %1, %16
%19 = phi i32 [ %17, %16 ], [ %2, %1 ], [ %5, %4 ], [ %8, %7 ], [ %11, %10 ], [ %14, %13 ]
ret i32 %19
}