#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 */
#define SIGHUP 130
#define SIGINT 129
#define SIGTERM 128
int /*<<< orphan*/ printf(char *);
void sig_handler(int sig) {
  switch (sig) {
  case SIGINT: {
    printf("SIGINT occured\n");
    break;
  }
  case SIGHUP: {
    printf("SIGHUP occured\n");
    break;
  }
  case SIGTERM: {
    printf("SIGTERM occured\n");
    break;
  }
  }
}


x86 assembly (clang, -O0):
<sig_handler>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
mov    %eax,-0x8(%rbp)
sub    $0x80,%eax
je     1179 <sig_handler+0x69>
jmp    1131 <sig_handler+0x21>
mov    -0x8(%rbp),%eax
sub    $0x81,%eax
je     1157 <sig_handler+0x47>
jmp    1144 <sig_handler+0x34>
mov    -0x8(%rbp),%eax
sub    $0x82,%eax
je     1168 <sig_handler+0x58>
jmp    1185 <sig_handler+0x75>
lea    0xea2(%rip),%rdi
call   1030 <printf@plt>
jmp    1185 <sig_handler+0x75>
lea    0xea1(%rip),%rdi
call   1030 <printf@plt>
jmp    1185 <sig_handler+0x75>
lea    0xea0(%rip),%rdi
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<sig_handler>:
add    $0xffffff80,%edi
cmp    $0x2,%edi
ja     112e <sig_handler+0x1e>
movslq %edi,%rax
lea    0xf0e(%rip),%rcx
movslq (%rcx,%rax,4),%rdi
add    %rcx,%rdi
jmp    1030 <puts@plt>
ret

LLVM IR (-O0):
@.str = [16 x i8] c"SIGINT occured\0A\00"
@.str.1 = [16 x i8] c"SIGHUP occured\0A\00"
@.str.2 = [17 x i8] c"SIGTERM occured\0A\00"
define void @sig_handler(i32 %0) {
%2 = alloca i32
store i32 %0, i32* %2
%3 = load i32, i32* %2
switch i32 %3, label %10 [
i32 129, label %4
i32 130, label %6
i32 128, label %8
]
4: ; preds = %1
%5 = call i32 @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str, i64 0, i64 0))
br label %10
6: ; preds = %1
%7 = call i32 @printf(i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.1, i64 0, i64 0))
br label %10
8: ; preds = %1
%9 = call i32 @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.2, i64 0, i64 0))
br label %10
10: ; preds = %1, %8, %6, %4
ret void
}

LLVM IR (-O2):
@str = [16 x i8] c"SIGTERM occured\00"
@str.3 = [15 x i8] c"SIGHUP occured\00"
@str.4 = [15 x i8] c"SIGINT occured\00"
@reltable.sig_handler = [3 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @str to i64), i64 ptrtoint ([3 x i32]* @reltable.sig_handler to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @str.4 to i64), i64 ptrtoint ([3 x i32]* @reltable.sig_handler to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([15 x i8]* @str.3 to i64), i64 ptrtoint ([3 x i32]* @reltable.sig_handler to i64)) to i32)]
define void @sig_handler(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 3
br i1 %3, label %4, label %9
4: ; preds = %1
%5 = sext i32 %2 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([3 x i32]* @reltable.sig_handler to i8*), i64 %6)
%8 = tail call i32 @puts(i8* dereferenceable(1) %7)
br label %9
9: ; preds = %1, %4
ret void
}