#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 */
#define FP_INFINITE 132
#define FP_NAN 131
#define FP_NORMAL 130
#define FP_SUBNORMAL 129
#define FP_ZERO 128
int fpclassify(float const);
const char *fpclassifyf_str(const float x) {
  switch (fpclassify(x)) {
  case FP_NAN:
    return "NaN";
  case FP_INFINITE:
    return "infinite";
  case FP_ZERO:
    return "zero";
  case FP_SUBNORMAL:
    return "denormalized";
  case FP_NORMAL:
    return "normalized";
  default:
    return "<unknown>";
  }
}


x86 assembly (clang, -O0):
<fpclassifyf_str>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movss  %xmm0,-0xc(%rbp)
movss  -0xc(%rbp),%xmm0
call   1030 <fpclassify@plt>
add    $0xffffff80,%eax
mov    %eax,%ecx
mov    %rcx,-0x18(%rbp)
sub    $0x4,%eax
ja     119d <fpclassifyf_str+0x8d>
mov    -0x18(%rbp),%rax
lea    0xebc(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
jmp    *%rax
lea    0xec0(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a8 <fpclassifyf_str+0x98>
lea    0xeb4(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a8 <fpclassifyf_str+0x98>
lea    0xead(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a8 <fpclassifyf_str+0x98>
lea    0xea2(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a8 <fpclassifyf_str+0x98>
lea    0xe94(%rip),%rax
mov    %rax,-0x8(%rbp)
jmp    11a8 <fpclassifyf_str+0x98>
lea    0xe8f(%rip),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<fpclassifyf_str>:
push   %rax
call   1030 <fpclassify@plt>
add    $0xffffff80,%eax
cmp    $0x4,%eax
ja     1130 <fpclassifyf_str+0x20>
cltq
lea    0xf05(%rip),%rcx
movslq (%rcx,%rax,4),%rax
add    %rcx,%rax
pop    %rcx
ret
lea    0xee8(%rip),%rax
pop    %rcx
ret

LLVM IR (-O0):
@.str = [4 x i8] c"NaN\00"
@.str.1 = [9 x i8] c"infinite\00"
@.str.2 = [5 x i8] c"zero\00"
@.str.3 = [13 x i8] c"denormalized\00"
@.str.4 = [11 x i8] c"normalized\00"
@.str.5 = [10 x i8] c"<unknown>\00"
define i8* @fpclassifyf_str(float %0) {
%2 = alloca i8*
%3 = alloca float
store float %0, float* %3
%4 = load float, float* %3
%5 = call i32 @fpclassify(float %4)
switch i32 %5, label %11 [
i32 131, label %6
i32 132, label %7
i32 128, label %8
i32 129, label %9
i32 130, label %10
]
6: ; preds = %1
store i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i8** %2
br label %12
7: ; preds = %1
store i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0), i8** %2
br label %12
8: ; preds = %1
store i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str.2, i64 0, i64 0), i8** %2
br label %12
9: ; preds = %1
store i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0), i8** %2
br label %12
10: ; preds = %1
store i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str.4, i64 0, i64 0), i8** %2
br label %12
11: ; preds = %1
store i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), i8** %2
br label %12
12: ; preds = %11, %10, %9, %8, %7, %6
%13 = load i8*, i8** %2
ret i8* %13
}

LLVM IR (-O2):
@.str = [4 x i8] c"NaN\00"
@.str.1 = [9 x i8] c"infinite\00"
@.str.2 = [5 x i8] c"zero\00"
@.str.3 = [13 x i8] c"denormalized\00"
@.str.4 = [11 x i8] c"normalized\00"
@.str.5 = [10 x i8] c"<unknown>\00"
@reltable.fpclassifyf_str = [5 x i32] [i32 trunc (i64 sub (i64 ptrtoint ([5 x i8]* @.str.2 to i64), i64 ptrtoint ([5 x i32]* @reltable.fpclassifyf_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([13 x i8]* @.str.3 to i64), i64 ptrtoint ([5 x i32]* @reltable.fpclassifyf_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([11 x i8]* @.str.4 to i64), i64 ptrtoint ([5 x i32]* @reltable.fpclassifyf_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([4 x i8]* @.str to i64), i64 ptrtoint ([5 x i32]* @reltable.fpclassifyf_str to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint ([9 x i8]* @.str.1 to i64), i64 ptrtoint ([5 x i32]* @reltable.fpclassifyf_str to i64)) to i32)]
define i8* @fpclassifyf_str(float %0) {
%2 = tail call i32 @fpclassify(float %0)
%3 = add i32 %2, -128
%4 = icmp ult i32 %3, 5
br i1 %4, label %5, label %9
5: ; preds = %1
%6 = sext i32 %3 to i64
%7 = shl i64 %6, 2
%8 = call i8* @llvm.load.relative.i64(i8* bitcast ([5 x i32]* @reltable.fpclassifyf_str to i8*), i64 %7)
br label %9
9: ; preds = %1, %5
%10 = phi i8* [ %8, %5 ], [ getelementptr inbounds ([10 x i8], [10 x i8]* @.str.5, i64 0, i64 0), %1 ]
ret i8* %10
}