#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
char *get_signal_name(int signum) {
  switch (signum) {
  case SIGHUP:
    return "SIGHUP";
  case SIGTERM:
    return "SIGTERM";
  case SIGINT:
    return "SIGINT";
  default:
    return "Unknown SIG";
  }
}


x86 assembly (clang, -O0):
<get_signal_name>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %eax,-0x10(%rbp)
sub    $0x80,%eax
je     1153 <get_signal_name+0x53>
jmp    111d <get_signal_name+0x1d>
mov    -0x10(%rbp),%eax
sub    $0x81,%eax
je     1163 <get_signal_name+0x63>
jmp    1130 <get_signal_name+0x30>
mov    -0x10(%rbp),%eax
sub    $0x82,%eax
jne    1173 <get_signal_name+0x73>
jmp    1143 <get_signal_name+0x43>
lea    0xeb6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117e <get_signal_name+0x7e>
lea    0xead(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117e <get_signal_name+0x7e>
lea    0xea5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117e <get_signal_name+0x7e>
lea    0xe9c(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_signal_name>:
add    $0xffffff80,%edi
cmp    $0x2,%edi
ja     111a <get_signal_name+0x1a>
movslq %edi,%rax
lea    0xf12(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xef5(%rip),%rax
ret

LLVM IR (-O0):
@.str = [7 x i8] c"SIGHUP\00"
@.str.1 = [8 x i8] c"SIGTERM\00"
@.str.2 = [7 x i8] c"SIGINT\00"
@.str.3 = [12 x i8] c"Unknown SIG\00"
define i8* @get_signal_name(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %8 [
i32 130, label %5
i32 128, label %6
i32 129, label %7
]
5: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8** %2
br label %9
6: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %9
7: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %9
8: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %9
9: ; preds = %8, %7, %6, %5
%10 = load i8*, i8** %2
ret i8* %10
}

LLVM IR (-O2):
@.str = [7 x i8] c"SIGHUP\00"
@.str.1 = [8 x i8] c"SIGTERM\00"
@.str.2 = [7 x i8] c"SIGINT\00"
@.str.3 = [12 x i8] c"Unknown SIG\00"
@reltable.get_signal_name = [3 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.1 to i64), i64 ptrtoint ([3 x i32]* @reltable.get_signal_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.2 to i64), i64 ptrtoint ([3 x i32]* @reltable.get_signal_name to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str to i64), i64 ptrtoint ([3 x i32]* @reltable.get_signal_name to i64)) to i32)]
define i8* @get_signal_name(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 3
br i1 %3, label %4, label %8
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.get_signal_name to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), %1 ]
ret i8* %9
}