char *get_error_string(int errorno) {
  switch (errorno) {
  case 0:
    return "Error: cannot connect to twitter!";
  case 1:
    return "Error in OAuth Reply. Please retry.";
  case 2:
    return "Error: PIN code length wrong!";
  case 3:
    return "Error in config file. Please delete it and retry.";
  case 4:
    return "Error: No writing priviledge.";
  case 5:
    return "Error in parsing xml.";
  case 6:
    return "Error: cannot find page start.";
  case 7:
    return "Error in memory allocation.";
  case 8:
    return "Error in threading.";
  default:
    return "An unknown error occurred...";
  }
}


x86 assembly (clang, -O0):
<get_error_string>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    %rax,-0x18(%rbp)
sub    $0x8,%rax
ja     11bc <get_error_string+0xbc>
mov    -0x18(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xef1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf03(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf17(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf25(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf47(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf55(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf5b(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf6a(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf76(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11c7 <get_error_string+0xc7>
lea    0xf7a(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_error_string>:
cmp    $0x8,%edi
ja     1117 <get_error_string+0x17>
movslq %edi,%rax
lea    0x1029(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xffb(%rip),%rax
ret

LLVM IR (-O0):
@.str = [34 x i8] c"Error: cannot connect to twitter!\00"
@.str.1 = [36 x i8] c"Error in OAuth Reply. Please retry.\00"
@.str.2 = [30 x i8] c"Error: PIN code length wrong!\00"
@.str.3 = [50 x i8] c"Error in config file. Please delete it and retry.\00"
@.str.4 = [30 x i8] c"Error: No writing priviledge.\00"
@.str.5 = [22 x i8] c"Error in parsing xml.\00"
@.str.6 = [31 x i8] c"Error: cannot find page start.\00"
@.str.7 = [28 x i8] c"Error in memory allocation.\00"
@.str.8 = [20 x i8] c"Error in threading.\00"
@.str.9 = [29 x i8] c"An unknown error occurred...\00"
define i8* @get_error_string(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %14 [
i32 0, label %5
i32 1, label %6
i32 2, label %7
i32 3, label %8
i32 4, label %9
i32 5, label %10
i32 6, label %11
i32 7, label %12
i32 8, label %13
]
5: ; preds = %1
store i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str, i64 0, i64 0), i8** %2
br label %15
6: ; preds = %1
store i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %15
7: ; preds = %1
store i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %15
8: ; preds = %1
store i8* getelementptr inbounds ([50 x i8], [50 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %15
9: ; preds = %1
store i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %15
10: ; preds = %1
store i8* getelementptr inbounds ([22 x i8], [22 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %15
11: ; preds = %1
store i8* getelementptr inbounds ([31 x i8], [31 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %15
12: ; preds = %1
store i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %15
13: ; preds = %1
store i8* getelementptr inbounds ([20 x i8], [20 x i8]* @.str.8, i64 0, i64 0), i8** %2
br label %15
14: ; preds = %1
store i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.9, i64 0, i64 0), i8** %2
br label %15
15: ; preds = %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%16 = load i8*, i8** %2
ret i8* %16
}

LLVM IR (-O2):
@.str = [34 x i8] c"Error: cannot connect to twitter!\00"
@.str.1 = [36 x i8] c"Error in OAuth Reply. Please retry.\00"
@.str.2 = [30 x i8] c"Error: PIN code length wrong!\00"
@.str.3 = [50 x i8] c"Error in config file. Please delete it and retry.\00"
@.str.4 = [30 x i8] c"Error: No writing priviledge.\00"
@.str.5 = [22 x i8] c"Error in parsing xml.\00"
@.str.6 = [31 x i8] c"Error: cannot find page start.\00"
@.str.7 = [28 x i8] c"Error in memory allocation.\00"
@.str.8 = [20 x i8] c"Error in threading.\00"
@.str.9 = [29 x i8] c"An unknown error occurred...\00"
@reltable.get_error_string = [9 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([34 x i8]* @.str to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([36 x i8]* @.str.1 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([30 x i8]* @.str.2 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([50 x i8]* @.str.3 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([30 x i8]* @.str.4 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([22 x i8]* @.str.5 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([31 x i8]* @.str.6 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([28 x i8]* @.str.7 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([20 x i8]* @.str.8 to i64), i64 ptrtoint ([9 x i32]* @reltable.get_error_string to i64)) to i32)]
define i8* @get_error_string(i32 %0) {
%2 = icmp ult i32 %0, 9
br i1 %2, label %3, label %7
3: ; preds = %1
%4 = sext i32 %0 to i64
%5 = shl i64 %4, 2
%6 = call i8* @llvm.load.relative.i64(i8* bitcast ([9 x i32]* @reltable.get_error_string to i8*), i64 %5)
br label %7
7: ; preds = %1, %3
%8 = phi i8* [ %6, %3 ], [ getelementptr inbounds ([29 x i8], [29 x i8]* @.str.9, i64 0, i64 0), %1 ]
ret i8* %8
}