#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 const);
double sqrt(double);
double pythag(const double a, const double b) {
  double absa, absb;
  absa = fabs(a);
  absb = fabs(b);
  if (absa > absb)
    return absa * sqrt(1.0 + (absb / absa) * (absb / absa));
  else
    return (absb == 0.0 ? 0.0
                        : absb * sqrt(1.0 + (absa / absb) * (absa / absb)));
}


x86 assembly (clang, -O0):
<pythag>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%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    11a5 <pythag+0x95>
movsd  -0x20(%rbp),%xmm0
movsd  %xmm0,-0x30(%rbp)
movsd  -0x28(%rbp),%xmm0
divsd  -0x20(%rbp),%xmm0
movsd  -0x28(%rbp),%xmm1
divsd  -0x20(%rbp),%xmm1
mulsd  %xmm1,%xmm0
movsd  0xe8a(%rip),%xmm1
addsd  %xmm1,%xmm0
call   1030 <sqrt@plt>
movaps %xmm0,%xmm1
movsd  -0x30(%rbp),%xmm0
mulsd  %xmm1,%xmm0
movsd  %xmm0,-0x8(%rbp)
jmp    1218 <pythag+0x108>
movsd  -0x28(%rbp),%xmm0
xorps  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jne    11ca <pythag+0xba>
jp     11ca <pythag+0xba>
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x38(%rbp)
jmp    120e <pythag+0xfe>
movsd  -0x28(%rbp),%xmm0
movsd  %xmm0,-0x40(%rbp)
movsd  -0x20(%rbp),%xmm0
divsd  -0x28(%rbp),%xmm0
movsd  -0x20(%rbp),%xmm1
divsd  -0x28(%rbp),%xmm1
mulsd  %xmm1,%xmm0
movsd  0xe1c(%rip),%xmm1
addsd  %xmm1,%xmm0
call   1030 <sqrt@plt>
movaps %xmm0,%xmm1
movsd  -0x40(%rbp),%xmm0
mulsd  %xmm1,%xmm0
movsd  %xmm0,-0x38(%rbp)
movsd  -0x38(%rbp),%xmm0
movsd  %xmm0,-0x8(%rbp)
movsd  -0x8(%rbp),%xmm0
add    $0x40,%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    1165 <pythag+0x55>
xorpd  %xmm3,%xmm3
ucomisd %xmm3,%xmm1
jne    114d <pythag+0x3d>
jnp    1188 <pythag+0x78>
movapd %xmm0,%xmm3
divsd  %xmm0,%xmm2
mulsd  %xmm2,%xmm2
addsd  0xeaf(%rip),%xmm2
movapd %xmm2,%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     1175 <pythag+0x65>
sqrtsd %xmm0,%xmm0
jmp    1184 <pythag+0x74>
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
store double %0, double* %4
store double %1, double* %5
%8 = load double, double* %4
%9 = call double @llvm.fabs.f64(double %8)
store double %9, double* %6
%10 = load double, double* %5
%11 = call double @llvm.fabs.f64(double %10)
store double %11, double* %7
%12 = load double, double* %6
%13 = load double, double* %7
%14 = fcmp ogt double %12, %13
br i1 %14, label %15, label %26
15: ; preds = %2
%16 = load double, double* %6
%17 = load double, double* %7
%18 = load double, double* %6
%19 = fdiv double %17, %18
%20 = load double, double* %7
%21 = load double, double* %6
%22 = fdiv double %20, %21
%23 = call double @llvm.fmuladd.f64(double %19, double %22, double 1.000000e+00)
%24 = call double @sqrt(double %23)
%25 = fmul double %16, %24
store double %25, double* %3
br label %43
26: ; preds = %2
%27 = load double, double* %7
%28 = fcmp oeq double %27, 0.000000e+00
br i1 %28, label %29, label %30
29: ; preds = %26
br label %41
30: ; preds = %26
%31 = load double, double* %7
%32 = load double, double* %6
%33 = load double, double* %7
%34 = fdiv double %32, %33
%35 = load double, double* %6
%36 = load double, double* %7
%37 = fdiv double %35, %36
%38 = call double @llvm.fmuladd.f64(double %34, double %37, double 1.000000e+00)
%39 = call double @sqrt(double %38)
%40 = fmul double %31, %39
br label %41
41: ; preds = %30, %29
%42 = phi double [ 0.000000e+00, %29 ], [ %40, %30 ]
store double %42, double* %3
br label %43
43: ; preds = %41, %15
%44 = load double, double* %3
ret double %44
}

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 oeq 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
}