#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 */
int pow10(int n) {
  switch (n) {
  case 0:
    return 1;
  case 1:
    return 10;
  case 2:
    return 100;
  case 3:
    return 1000;
  case 4:
    return 10000;
  case 5:
    return 100000;
  case 6:
    return 1000000;
  case 7:
    return 10000000;
  case 8:
    return 100000000;
  case 9:
    return 1000000000;
  }
  return -1;
}


x86 assembly (clang, -O0):
<pow10>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x8(%rbp)
mov    -0x8(%rbp),%eax
mov    %rax,-0x10(%rbp)
sub    $0x9,%rax
ja     11a4 <pow10+0xa4>
mov    -0x10(%rbp),%rax
lea    0xedd(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
movl   $0x1,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0xa,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0x64,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0x3e8,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0x2710,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0x186a0,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0xf4240,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0x989680,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0x5f5e100,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0x3b9aca00,-0x4(%rbp)
jmp    11ab <pow10+0xab>
movl   $0xffffffff,-0x4(%rbp)
mov    -0x4(%rbp),%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<pow10>:
mov    $0xffffffff,%eax
cmp    $0x9,%edi
ja     1117 <pow10+0x17>
movslq %edi,%rax
lea    0xeec(%rip),%rcx
mov    (%rcx,%rax,4),%eax
ret

LLVM IR (-O0):
define i32 @pow10(i32 %0) {
%2 = alloca i32
%3 = alloca i32
store i32 %0, i32* %3
%4 = load i32, i32* %3
switch i32 %4, label %15 [
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
i32 9, label %14
]
5: ; preds = %1
store i32 1, i32* %2
br label %16
6: ; preds = %1
store i32 10, i32* %2
br label %16
7: ; preds = %1
store i32 100, i32* %2
br label %16
8: ; preds = %1
store i32 1000, i32* %2
br label %16
9: ; preds = %1
store i32 10000, i32* %2
br label %16
10: ; preds = %1
store i32 100000, i32* %2
br label %16
11: ; preds = %1
store i32 1000000, i32* %2
br label %16
12: ; preds = %1
store i32 10000000, i32* %2
br label %16
13: ; preds = %1
store i32 100000000, i32* %2
br label %16
14: ; preds = %1
store i32 1000000000, i32* %2
br label %16
15: ; preds = %1
store i32 -1, i32* %2
br label %16
16: ; preds = %15, %14, %13, %12, %11, %10, %9, %8, %7, %6, %5
%17 = load i32, i32* %2
ret i32 %17
}

LLVM IR (-O2):
@switch.table.pow10 = [10 x i32] [i32 1, i32 10, i32 100, i32 1000, i32 10000, i32 100000, i32 1000000, i32 10000000, i32 100000000, i32 1000000000]
define i32 @pow10(i32 %0) {
%2 = icmp ult i32 %0, 10
br i1 %2, label %3, label %7
3: ; preds = %1
%4 = sext i32 %0 to i64
%5 = getelementptr inbounds [10 x i32], [10 x i32]* @switch.table.pow10, i64 0, i64 %4
%6 = load i32, i32* %5
br label %7
7: ; preds = %1, %3
%8 = phi i32 [ %6, %3 ], [ -1, %1 ]
ret i32 %8
}