#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 */
typedef int u_char;

/* Variables and functions */
#define MTD_ABSENT 134
#define MTD_DATAFLASH 133
#define MTD_NANDFLASH 132
#define MTD_NORFLASH 131
#define MTD_RAM 130
#define MTD_ROM 129
#define MTD_UBIVOLUME 128
char *get_flash_type(u_char type) {
  switch (type) {
  case MTD_ABSENT:
    return "MTD_ABSENT";
  case MTD_RAM:
    return "MTD_RAM";
  case MTD_ROM:
    return "MTD_ROM";
  case MTD_NORFLASH:
    return "NOR flash";
  case MTD_NANDFLASH:
    return "NAND flash";
  case MTD_DATAFLASH:
    return "MTD dataflash";
  case MTD_UBIVOLUME:
    return "MTD_UBIVOLUME";
  default:
    break;
  }
  return "Unknown!";
}


x86 assembly (clang, -O0):
<get_flash_type>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0xc(%rbp)
mov    -0xc(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x6,%eax
ja     11a0 <get_flash_type+0xa0>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xee5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b0 <get_flash_type+0xb0>
lea    0xee0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b0 <get_flash_type+0xb0>
lea    0xed8(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b0 <get_flash_type+0xb0>
lea    0xed0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b0 <get_flash_type+0xb0>
lea    0xeca(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b0 <get_flash_type+0xb0>
lea    0xec5(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b0 <get_flash_type+0xb0>
lea    0xec3(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11b0 <get_flash_type+0xb0>
jmp    11a5 <get_flash_type+0xa5>
lea    0xebc(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_flash_type>:
add    $0xffffff80,%edi
cmp    $0x6,%edi
ja     111a <get_flash_type+0x1a>
movslq %edi,%rax
lea    0xf46(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xf2b(%rip),%rax
ret

LLVM IR (-O0):
@.str = [11 x i8] c"MTD_ABSENT\00"
@.str.1 = [8 x i8] c"MTD_RAM\00"
@.str.2 = [8 x i8] c"MTD_ROM\00"
@.str.3 = [10 x i8] c"NOR flash\00"
@.str.4 = [11 x i8] c"NAND flash\00"
@.str.5 = [14 x i8] c"MTD dataflash\00"
@.str.6 = [14 x i8] c"MTD_UBIVOLUME\00"
@.str.7 = [9 x i8] c"Unknown!\00"
define i8* @get_flash_type(i32 %0) {
%2 = alloca i8*
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %12 [
i32 134, label %5
i32 130, label %6
i32 129, label %7
i32 131, label %8
i32 132, label %9
i32 133, label %10
i32 128, label %11
]
5: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i8** %2
br label %14
6: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %14
7: ; preds = %1
store i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %14
8: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %14
9: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %14
10: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %14
11: ; preds = %1
store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.6, i64 0, i64 0), i8** %2
br label %14
12: ; preds = %1
br label %13
13: ; preds = %12
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.7, i64 0, i64 0), i8** %2
br label %14
14: ; preds = %13, %11, %10, %9, %8, %7, %6, %5
%15 = load i8*, i8** %2
ret i8* %15
}

LLVM IR (-O2):
@.str = [11 x i8] c"MTD_ABSENT\00"
@.str.1 = [8 x i8] c"MTD_RAM\00"
@.str.2 = [8 x i8] c"MTD_ROM\00"
@.str.3 = [10 x i8] c"NOR flash\00"
@.str.4 = [11 x i8] c"NAND flash\00"
@.str.5 = [14 x i8] c"MTD dataflash\00"
@.str.6 = [14 x i8] c"MTD_UBIVOLUME\00"
@.str.7 = [9 x i8] c"Unknown!\00"
@reltable.get_flash_type = [7 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.6 to i64), i64 ptrtoint ([7 x i32]* @reltable.get_flash_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.2 to i64), i64 ptrtoint ([7 x i32]* @reltable.get_flash_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([8 x i8]* @.str.1 to i64), i64 ptrtoint ([7 x i32]* @reltable.get_flash_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([10 x i8]* @.str.3 to i64), i64 ptrtoint ([7 x i32]* @reltable.get_flash_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.4 to i64), i64 ptrtoint ([7 x i32]* @reltable.get_flash_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([14 x i8]* @.str.5 to i64), i64 ptrtoint ([7 x i32]* @reltable.get_flash_type to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str to i64), i64 ptrtoint ([7 x i32]* @reltable.get_flash_type to i64)) to i32)]
define i8* @get_flash_type(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 7
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 ([7 x i32]* @reltable.get_flash_type to i8*), i64 %6)
br label %8
8: ; preds = %1, %4
%9 = phi i8* [ %7, %4 ], [ getelementptr inbounds ([9 x i8], [9 x i8]* @.str.7, i64 0, i64 0), %1 ]
ret i8* %9
}