extern char *formstr(int f) {
  switch (f) {
  case 'a':
    return ("ascii");
  case 'f':
    return ("float");
  case 'd':
    return ("double");
  case 'c':
    return ("32-bit_rle_rgbe");
  }
  return ("unknown");
}


x86 assembly (clang, -O0):
<formstr>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffff9f,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x5,%eax
ja     1170 <formstr+0x70>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee1(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <formstr+0x7b>
lea    0xed7(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <formstr+0x7b>
lea    0xecd(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <formstr+0x7b>
lea    0xec4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    117b <formstr+0x7b>
lea    0xec4(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<formstr>:
add    $0xffffff9f,%edi
cmp    $0x5,%edi
ja     111a <formstr+0x1a>
movslq %edi,%rax
lea    0xf1a(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf02(%rip),%rax
ret

LLVM IR (-O0):
@.str = [6 x i8] c"ascii\00"
@.str.1 = [6 x i8] c"float\00"
@.str.2 = [7 x i8] c"double\00"
@.str.3 = [16 x i8] c"32-bit_rle_rgbe\00"
@.str.4 = [8 x i8] c"unknown\00"
define i8* @formstr(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %9 [
i32 97, label %5
i32 102, label %6
i32 100, label %7
i32 99, label %8
]
5: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str, i64 0, i64 0), i8** %2
br label %10
6: ; preds = %1
store i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %10
7: ; preds = %1
store i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %10
8: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %10
9: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 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 = [6 x i8] c"ascii\00"
@.str.1 = [6 x i8] c"float\00"
@.str.2 = [7 x i8] c"double\00"
@.str.3 = [16 x i8] c"32-bit_rle_rgbe\00"
@.str.4 = [8 x i8] c"unknown\00"
@reltable.formstr = [6 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str to i64), i64 ptrtoint ([6 x i32]* @reltable.formstr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([6 x i32]* @reltable.formstr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.3 to i64), i64 ptrtoint ([6 x i32]* @reltable.formstr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([7 x i8]* @.str.2 to i64), i64 ptrtoint ([6 x i32]* @reltable.formstr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.4 to i64), i64 ptrtoint ([6 x i32]* @reltable.formstr to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([6 x i8]* @.str.1 to i64), i64 ptrtoint ([6 x i32]* @reltable.formstr to i64)) to i32)]
define i8* @formstr(i32 %0) {
%2 = add i32 %0, -97
%3 = icmp ult i32 %2, 6
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 ([6 x i32]* @reltable.formstr to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([8 x i8], [8 x i8]* @.str.4, i64 0, i64 0), %1 ]
ret i8* %9
}