#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 */
double fabs(double);
double const sqrt(double);
double PYTHAG(double a, double b) {
  const double at = fabs(a), bt = fabs(b);
  if (at > bt) {
    const double ct = bt / at;
    return at * sqrt(1.0 + ct * ct);
  }
  if (bt > 0.0) {
    const double ct = at / bt;
    return bt * sqrt(1.0 + ct * ct);
  }
  return 0.0;
}


x86 assembly (clang, -O0):
<PYTHAG>:
push   %rbp
mov    %rsp,%rbp
sub    $0x50,%rsp
movsd  %xmm0,-0x10(%rbp)
movsd  %xmm1,-0x18(%rbp)
movsd  -0x10(%rbp),%xmm0
movaps 0xed2(%rip),%xmm1
pand   %xmm1,%xmm0
movsd  %xmm0,-0x20(%rbp)
movsd  -0x18(%rbp),%xmm0
movaps 0xebd(%rip),%xmm1
pand   %xmm1,%xmm0
movsd  %xmm0,-0x28(%rbp)
movsd  -0x20(%rbp),%xmm0
ucomisd -0x28(%rbp),%xmm0
jbe    11aa <PYTHAG+0x9a>
movsd  -0x28(%rbp),%xmm0
divsd  -0x20(%rbp),%xmm0
movsd  %xmm0,-0x30(%rbp)
movsd  -0x20(%rbp),%xmm0
movsd  %xmm0,-0x40(%rbp)
movsd  -0x30(%rbp),%xmm0
movsd  -0x30(%rbp),%xmm1
mulsd  %xmm1,%xmm0
movsd  0xe85(%rip),%xmm1
addsd  %xmm1,%xmm0
call   1030 <sqrt@plt>
movaps %xmm0,%xmm1
movsd  -0x40(%rbp),%xmm0
mulsd  %xmm1,%xmm0
movsd  %xmm0,-0x8(%rbp)
jmp    1212 <PYTHAG+0x102>
movsd  -0x28(%rbp),%xmm0
xorps  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jbe    120a <PYTHAG+0xfa>
movsd  -0x20(%rbp),%xmm0
divsd  -0x28(%rbp),%xmm0
movsd  %xmm0,-0x38(%rbp)
movsd  -0x28(%rbp),%xmm0
movsd  %xmm0,-0x48(%rbp)
movsd  -0x38(%rbp),%xmm0
movsd  -0x38(%rbp),%xmm1
mulsd  %xmm1,%xmm0
movsd  0xe25(%rip),%xmm1
addsd  %xmm1,%xmm0
call   1030 <sqrt@plt>
movaps %xmm0,%xmm1
movsd  -0x48(%rbp),%xmm0
mulsd  %xmm1,%xmm0
movsd  %xmm0,-0x8(%rbp)
jmp    1212 <PYTHAG+0x102>
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x8(%rbp)
movsd  -0x8(%rbp),%xmm0
add    $0x50,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<PYTHAG>:
push   %rax
movapd %xmm0,%xmm2
movapd 0xee3(%rip),%xmm0
andpd  %xmm0,%xmm2
andpd  %xmm1,%xmm0
ucomisd %xmm0,%xmm2
jbe    1141 <PYTHAG+0x31>
divsd  %xmm2,%xmm0
mulsd  %xmm0,%xmm0
addsd  0xed5(%rip),%xmm0
movapd %xmm2,%xmm3
jmp    1163 <PYTHAG+0x53>
xorpd  %xmm3,%xmm3
ucomisd %xmm3,%xmm1
je     1186 <PYTHAG+0x76>
movapd %xmm0,%xmm3
divsd  %xmm0,%xmm2
mulsd  %xmm2,%xmm2
addsd  0xeb1(%rip),%xmm2
movapd %xmm2,%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     1173 <PYTHAG+0x63>
sqrtsd %xmm0,%xmm0
jmp    1182 <PYTHAG+0x72>
movsd  %xmm3,(%rsp)
call   1030 <sqrt@plt>
movsd  (%rsp),%xmm3
mulsd  %xmm0,%xmm3
movapd %xmm3,%xmm0
pop    %rax
ret

LLVM IR (-O0):
define double @PYTHAG(double %0, double %1) {
%3 = alloca double
%4 = alloca double
%5 = alloca double
%6 = alloca double
%7 = alloca double
%8 = alloca double
%9 = alloca double
store double %0, double* %4
store double %1, double* %5
%10 = load double, double* %4
%11 = call double @llvm.fabs.f64(double %10)
store double %11, double* %6
%12 = load double, double* %5
%13 = call double @llvm.fabs.f64(double %12)
store double %13, double* %7
%14 = load double, double* %6
%15 = load double, double* %7
%16 = fcmp ogt double %14, %15
br i1 %16, label %17, label %27
17: ; preds = %2
%18 = load double, double* %7
%19 = load double, double* %6
%20 = fdiv double %18, %19
store double %20, double* %8
%21 = load double, double* %6
%22 = load double, double* %8
%23 = load double, double* %8
%24 = call double @llvm.fmuladd.f64(double %22, double %23, double 1.000000e+00)
%25 = call double @sqrt(double %24)
%26 = fmul double %21, %25
store double %26, double* %3
br label %41
27: ; preds = %2
%28 = load double, double* %7
%29 = fcmp ogt double %28, 0.000000e+00
br i1 %29, label %30, label %40
30: ; preds = %27
%31 = load double, double* %6
%32 = load double, double* %7
%33 = fdiv double %31, %32
store double %33, double* %9
%34 = load double, double* %7
%35 = load double, double* %9
%36 = load double, double* %9
%37 = call double @llvm.fmuladd.f64(double %35, double %36, double 1.000000e+00)
%38 = call double @sqrt(double %37)
%39 = fmul double %34, %38
store double %39, double* %3
br label %41
40: ; preds = %27
store double 0.000000e+00, double* %3
br label %41
41: ; preds = %40, %30, %17
%42 = load double, double* %3
ret double %42
}

LLVM IR (-O2):
define double @PYTHAG(double %0, double %1) {
%3 = tail call double @llvm.fabs.f64(double %0)
%4 = tail call double @llvm.fabs.f64(double %1)
%5 = fcmp ogt double %3, %4
br i1 %5, label %6, label %9
6: ; preds = %2
%7 = fdiv double %4, %3
%8 = tail call double @llvm.fmuladd.f64(double %7, double %7, double 1.000000e+00)
br label %14
9: ; preds = %2
%10 = fcmp ueq double %1, 0.000000e+00
br i1 %10, label %19, label %11
11: ; preds = %9
%12 = fdiv double %3, %4
%13 = tail call double @llvm.fmuladd.f64(double %12, double %12, double 1.000000e+00)
br label %14
14: ; preds = %6, %11
%15 = phi double [ %13, %11 ], [ %8, %6 ]
%16 = phi double [ %4, %11 ], [ %3, %6 ]
%17 = tail call double @sqrt(double %15)
%18 = fmul double %16, %17
br label %19
19: ; preds = %14, %9
%20 = phi double [ 0.000000e+00, %9 ], [ %18, %14 ]
ret double %20
}