const char *getInchiErrName(int nErr) {
  switch (nErr) {
  case (-1):
    return "Allocation failed";
  case (-3):
    return "Program error";
  case (-2):
    return "Syntax error";
  case (-4):
    return "End of line";
  }
  return "Unknown error";
}


x86 assembly (clang, -O0):
<getInchiErrName>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0x4,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x3,%eax
ja     1170 <getInchiErrName+0x70>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xed9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <getInchiErrName+0x7b>
lea    0xedb(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <getInchiErrName+0x7b>
lea    0xed9(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <getInchiErrName+0x7b>
lea    0xed6(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <getInchiErrName+0x7b>
lea    0xed2(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<getInchiErrName>:
cmp    $0xfffffffc,%edi
jb     111a <getInchiErrName+0x1a>
add    $0x4,%edi
movslq %edi,%rax
lea    0xf36(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf18(%rip),%rax
ret

LLVM IR (-O0):
@.str = [18 x i8] c"Allocation failed\00"
@.str.1 = [14 x i8] c"Program error\00"
@.str.2 = [13 x i8] c"Syntax error\00"
@.str.3 = [12 x i8] c"End of line\00"
@.str.4 = [14 x i8] c"Unknown error\00"
define i8* @getInchiErrName(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %9 [
i32 -1, label %5
i32 -3, label %6
i32 -2, label %7
i32 -4, label %8
]
5: ; preds = %1
store i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0), i8** %2
br label %10
6: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %10
7: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %10
8: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %10
9: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %10
10: ; preds = %9, %8, %7, %6, %5
%11 = load i8*, i8** %2
ret i8* %11
}

LLVM IR (-O2):
@.str = [18 x i8] c"Allocation failed\00"
@.str.1 = [14 x i8] c"Program error\00"
@.str.2 = [13 x i8] c"Syntax error\00"
@.str.3 = [12 x i8] c"End of line\00"
@.str.4 = [14 x i8] c"Unknown error\00"
@reltable.getInchiErrName = [4 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str.3 to i64), i64 ptrtoint ([4 x i32]* @reltable.getInchiErrName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.1 to i64), i64 ptrtoint ([4 x i32]* @reltable.getInchiErrName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.2 to i64), i64 ptrtoint ([4 x i32]* @reltable.getInchiErrName to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([18 x i8]* @.str to i64), i64 ptrtoint ([4 x i32]* @reltable.getInchiErrName to i64)) to i32)]
define i8* @getInchiErrName(i32 %0) {
%2 = icmp ugt i32 %0, -5
br i1 %2, label %3, label %8
3: ; preds = %1
%4 = add i32 %0, 4
%5 = sext i32 %4 to i64
%6 = shl i64 %5, 2
%7 = call i8* @llvm.load.relative.i64(i8* bitcast ([4 x i32]* @reltable.getInchiErrName to i8*), i64 %6)
br label %8
8: ; preds = %1, %3
%9 = phi i8* [ %7, %3 ], [ getelementptr inbounds ([14 x i8], [14 x i8]* @.str.4, i64 0, i64 0), %1 ]
ret i8* %9
}