#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 GLenum;

/* Variables and functions */
#define GL_INVALID_ENUM 132
#define GL_INVALID_OPERATION 131
#define GL_INVALID_VALUE 130
#define GL_NO_ERROR 129
#define GL_OUT_OF_MEMORY 128
const char *ErrorString(GLenum error) {
  const char *msg;
  switch (error) {
  case GL_NO_ERROR:
    msg = "GL_NO_ERROR";
    break;
    ;
  case GL_INVALID_VALUE:
    msg = "GL_INVALID_VALUE";
    break;
    ;
  case GL_INVALID_ENUM:
    msg = "GL_INVALID_ENUM";
    break;
    ;
  case GL_INVALID_OPERATION:
    msg = "GL_INVALID_OPERATION";
    break;
    ;
  case GL_OUT_OF_MEMORY:
    msg = "GL_OUT_OF_MEMORY";
    break;
    ;
  }
  return msg;
}


x86 assembly (clang, -O0):
<ErrorString>:
push   %rbp
mov    %rsp,%rbp
mov    %edi,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x4,%eax
ja     117b <ErrorString+0x7b>
mov    -0x18(%rbp),%rax
lea    0xed9(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xedd(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    117b <ErrorString+0x7b>
lea    0xed9(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    117b <ErrorString+0x7b>
lea    0xeda(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    117b <ErrorString+0x7b>
lea    0xeda(%rip),%rax
mov    %rax,-0x10(%rbp)
jmp    117b <ErrorString+0x7b>
lea    0xedf(%rip),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
pop    %rbp
ret

x86 assembly (clang, -O2):
<ErrorString>:
add    $0xffffff80,%edi
cmp    $0x4,%edi
ja     111a <ErrorString+0x1a>
movslq %edi,%rax
lea    0xf42(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
ret
lea    0xedf(%rip),%rax
ret

LLVM IR (-O0):
@.str = [12 x i8] c"GL_NO_ERROR\00"
@.str.1 = [17 x i8] c"GL_INVALID_VALUE\00"
@.str.2 = [16 x i8] c"GL_INVALID_ENUM\00"
@.str.3 = [21 x i8] c"GL_INVALID_OPERATION\00"
@.str.4 = [17 x i8] c"GL_OUT_OF_MEMORY\00"
define i8* @ErrorString(i32 %0) {
%2 = alloca i32
%3 = alloca i8*
store i32 %0, i32* %2
%4 = load i32, i32* %2
switch i32 %4, label %10 [
i32 129, label %5
i32 130, label %6
i32 132, label %7
i32 131, label %8
i32 128, label %9
]
5: ; preds = %1
store i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i8** %3
br label %10
6: ; preds = %1
store i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.1, i64 0, i64 0), i8** %3
br label %10
7: ; preds = %1
store i8* getelementptr inbounds ([16 x i8], [16 x i8]* @.str.2, i64 0, i64 0), i8** %3
br label %10
8: ; preds = %1
store i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.3, i64 0, i64 0), i8** %3
br label %10
9: ; preds = %1
store i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str.4, i64 0, i64 0), i8** %3
br label %10
10: ; preds = %1, %9, %8, %7, %6, %5
%11 = load i8*, i8** %3
ret i8* %11
}

LLVM IR (-O2):
@.str = [12 x i8] c"GL_NO_ERROR\00"
@.str.1 = [17 x i8] c"GL_INVALID_VALUE\00"
@.str.2 = [16 x i8] c"GL_INVALID_ENUM\00"
@.str.3 = [21 x i8] c"GL_INVALID_OPERATION\00"
@.str.4 = [17 x i8] c"GL_OUT_OF_MEMORY\00"
@reltable.ErrorString = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([17 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.ErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([12 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.ErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([17 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.ErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([21 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.ErrorString to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([16 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.ErrorString to i64)) to i32)]
define i8* @ErrorString(i32 %0) {
%2 = add i32 %0, -128
%3 = icmp ult i32 %2, 5
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 ([5 x i32]* @reltable.ErrorString to i8*), i64 %6)
br label %8
8: ; preds = %4, %1
%9 = phi i8* [ getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), %1 ], [ %7, %4 ]
ret i8* %9
}