#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 /*<<< orphan*/ ERANGE;
int FP_INFINITE;
int FP_NAN;
int /*<<< orphan*/ __set_errno(int /*<<< orphan*/);
int fpclassify(double);
double __fdim(double x, double y) {
  int clsx = fpclassify(x);
  int clsy = fpclassify(y);
  if (clsx == FP_NAN || clsy == FP_NAN ||
      (y < 0 && clsx == FP_INFINITE && clsy == FP_INFINITE))
    return x - y;
  if (x <= y)
    return 0.0;
  double r = x - y;
  if (fpclassify(r) == FP_INFINITE)
    __set_errno(ERANGE);
  return r;
}


x86 assembly (clang, -O0):
<__fdim>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movsd  %xmm0,-0x10(%rbp)
movsd  %xmm1,-0x18(%rbp)
movsd  -0x10(%rbp),%xmm0
call   1040 <fpclassify@plt>
mov    %eax,-0x1c(%rbp)
movsd  -0x18(%rbp),%xmm0
call   1040 <fpclassify@plt>
mov    %eax,-0x20(%rbp)
mov    -0x1c(%rbp),%eax
mov    0x2e92(%rip),%rcx
cmp    (%rcx),%eax
je     11a2 <__fdim+0x82>
mov    -0x20(%rbp),%eax
mov    0x2e80(%rip),%rcx
cmp    (%rcx),%eax
je     11a2 <__fdim+0x82>
xorps  %xmm0,%xmm0
ucomisd -0x18(%rbp),%xmm0
jbe    11b6 <__fdim+0x96>
mov    -0x1c(%rbp),%eax
mov    0x2e58(%rip),%rcx
cmp    (%rcx),%eax
jne    11b6 <__fdim+0x96>
mov    -0x20(%rbp),%eax
mov    0x2e46(%rip),%rcx
cmp    (%rcx),%eax
jne    11b6 <__fdim+0x96>
movsd  -0x10(%rbp),%xmm0
subsd  -0x18(%rbp),%xmm0
movsd  %xmm0,-0x8(%rbp)
jmp    1217 <__fdim+0xf7>
movsd  -0x10(%rbp),%xmm1
movsd  -0x18(%rbp),%xmm0
ucomisd %xmm1,%xmm0
jb     11d7 <__fdim+0xb7>
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x8(%rbp)
jmp    1217 <__fdim+0xf7>
movsd  -0x10(%rbp),%xmm0
subsd  -0x18(%rbp),%xmm0
movsd  %xmm0,-0x28(%rbp)
movsd  -0x28(%rbp),%xmm0
call   1040 <fpclassify@plt>
mov    0x2de9(%rip),%rcx
cmp    (%rcx),%eax
jne    120d <__fdim+0xed>
mov    0x2dd2(%rip),%rax
mov    (%rax),%edi
call   1030 <__set_errno@plt>
movsd  -0x28(%rbp),%xmm0
movsd  %xmm0,-0x8(%rbp)
movsd  -0x8(%rbp),%xmm0
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<__fdim>:
push   %rbx
sub    $0x10,%rsp
movsd  %xmm1,0x8(%rsp)
movsd  %xmm0,(%rsp)
call   1040 <fpclassify@plt>
mov    %eax,%ebx
movsd  0x8(%rsp),%xmm0
call   1040 <fpclassify@plt>
movsd  0x8(%rsp),%xmm2
mov    0x2e99(%rip),%rcx
mov    (%rcx),%ecx
cmp    %ecx,%ebx
je     1174 <__fdim+0x54>
cmp    %ecx,%eax
je     1174 <__fdim+0x54>
xorpd  %xmm0,%xmm0
ucomisd %xmm2,%xmm0
jbe    117f <__fdim+0x5f>
mov    0x2e76(%rip),%rcx
mov    (%rcx),%ecx
cmp    %ecx,%ebx
jne    117f <__fdim+0x5f>
cmp    %ecx,%eax
jne    117f <__fdim+0x5f>
movsd  (%rsp),%xmm0
subsd  %xmm2,%xmm0
jmp    11ba <__fdim+0x9a>
movsd  (%rsp),%xmm1
ucomisd %xmm1,%xmm2
jae    11ba <__fdim+0x9a>
subsd  %xmm2,%xmm1
movsd  %xmm1,(%rsp)
movapd %xmm1,%xmm0
call   1040 <fpclassify@plt>
mov    0x2e3d(%rip),%rcx
cmp    (%rcx),%eax
jne    11b5 <__fdim+0x95>
mov    0x2e2a(%rip),%rax
mov    (%rax),%edi
call   1030 <__set_errno@plt>
movsd  (%rsp),%xmm0
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
@FP_NAN = global i32 0
@FP_INFINITE = global i32 0
@ERANGE = global i32 0
define double @__fdim(double %0, double %1) {
%3 = alloca double
%4 = alloca double
%5 = alloca double
%6 = alloca i32
%7 = alloca i32
%8 = alloca double
store double %0, double* %4
store double %1, double* %5
%9 = load double, double* %4
%10 = call i32 @fpclassify(double %9)
store i32 %10, i32* %6
%11 = load double, double* %5
%12 = call i32 @fpclassify(double %11)
store i32 %12, i32* %7
%13 = load i32, i32* %6
%14 = load i32, i32* @FP_NAN
%15 = icmp eq i32 %13, %14
br i1 %15, label %31, label %16
16: ; preds = %2
%17 = load i32, i32* %7
%18 = load i32, i32* @FP_NAN
%19 = icmp eq i32 %17, %18
br i1 %19, label %31, label %20
20: ; preds = %16
%21 = load double, double* %5
%22 = fcmp olt double %21, 0.000000e+00
br i1 %22, label %23, label %35
23: ; preds = %20
%24 = load i32, i32* %6
%25 = load i32, i32* @FP_INFINITE
%26 = icmp eq i32 %24, %25
br i1 %26, label %27, label %35
27: ; preds = %23
%28 = load i32, i32* %7
%29 = load i32, i32* @FP_INFINITE
%30 = icmp eq i32 %28, %29
br i1 %30, label %31, label %35
31: ; preds = %27, %16, %2
%32 = load double, double* %4
%33 = load double, double* %5
%34 = fsub double %32, %33
store double %34, double* %3
br label %53
35: ; preds = %27, %23, %20
%36 = load double, double* %4
%37 = load double, double* %5
%38 = fcmp ole double %36, %37
br i1 %38, label %39, label %40
39: ; preds = %35
store double 0.000000e+00, double* %3
br label %53
40: ; preds = %35
%41 = load double, double* %4
%42 = load double, double* %5
%43 = fsub double %41, %42
store double %43, double* %8
%44 = load double, double* %8
%45 = call i32 @fpclassify(double %44)
%46 = load i32, i32* @FP_INFINITE
%47 = icmp eq i32 %45, %46
br i1 %47, label %48, label %51
48: ; preds = %40
%49 = load i32, i32* @ERANGE
%50 = call i32 @__set_errno(i32 %49)
br label %51
51: ; preds = %48, %40
%52 = load double, double* %8
store double %52, double* %3
br label %53
53: ; preds = %51, %39, %31
%54 = load double, double* %3
ret double %54
}

LLVM IR (-O2):
@FP_NAN = global i32 0
@FP_INFINITE = global i32 0
@ERANGE = global i32 0
define double @__fdim(double %0, double %1) {
%3 = tail call i32 @fpclassify(double %0)
%4 = tail call i32 @fpclassify(double %1)
%5 = load i32, i32* @FP_NAN
%6 = icmp eq i32 %3, %5
%7 = icmp eq i32 %4, %5
%8 = select i1 %6, i1 true, i1 %7
br i1 %8, label %16, label %9
9: ; preds = %2
%10 = fcmp olt double %1, 0.000000e+00
br i1 %10, label %11, label %18
11: ; preds = %9
%12 = load i32, i32* @FP_INFINITE
%13 = icmp eq i32 %3, %12
%14 = icmp eq i32 %4, %12
%15 = select i1 %13, i1 %14, i1 false
br i1 %15, label %16, label %18
16: ; preds = %11, %2
%17 = fsub double %0, %1
br label %28
18: ; preds = %11, %9
%19 = fcmp ugt double %0, %1
br i1 %19, label %20, label %28
20: ; preds = %18
%21 = fsub double %0, %1
%22 = tail call i32 @fpclassify(double %21)
%23 = load i32, i32* @FP_INFINITE
%24 = icmp eq i32 %22, %23
br i1 %24, label %25, label %28
25: ; preds = %20
%26 = load i32, i32* @ERANGE
%27 = tail call i32 @__set_errno(i32 %26)
br label %28
28: ; preds = %20, %25, %18, %16
%29 = phi double [ %17, %16 ], [ 0.000000e+00, %18 ], [ %21, %25 ], [ %21, %20 ]
ret double %29
}