#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 ang2pix_nest_z_phi(long, double const, int /*<<< orphan*/);
int /*<<< orphan*/ atan2(double const, double const);
double sqrt(double const);
int vec2pix_nest(long nside, const double *vec) {
  double vlen = sqrt(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);
  return ang2pix_nest_z_phi(nside, vec[2] / vlen, atan2(vec[1], vec[0]));
}


x86 assembly (clang, -O0):
<vec2pix_nest>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x10(%rbp),%rax
movsd  (%rax),%xmm1
mov    -0x10(%rbp),%rax
movsd  (%rax),%xmm2
mov    -0x10(%rbp),%rax
movsd  0x8(%rax),%xmm0
mov    -0x10(%rbp),%rax
mulsd  0x8(%rax),%xmm0
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
mov    -0x10(%rbp),%rax
movsd  0x10(%rax),%xmm0
mov    -0x10(%rbp),%rax
movsd  0x10(%rax),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
call   1050 <sqrt@plt>
movsd  %xmm0,-0x18(%rbp)
mov    -0x8(%rbp),%rax
mov    %rax,-0x28(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x10(%rax),%xmm0
divsd  -0x18(%rbp),%xmm0
movsd  %xmm0,-0x20(%rbp)
mov    -0x10(%rbp),%rax
movsd  0x8(%rax),%xmm0
mov    -0x10(%rbp),%rax
movsd  (%rax),%xmm1
call   1040 <atan2@plt>
mov    -0x28(%rbp),%rdi
movsd  -0x20(%rbp),%xmm0
mov    %eax,%esi
call   1030 <ang2pix_nest_z_phi@plt>
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<vec2pix_nest>:
push   %r14
push   %rbx
push   %rax
mov    %rsi,%rbx
mov    %rdi,%r14
movsd  (%rsi),%xmm1
movsd  0x8(%rsi),%xmm0
mulsd  %xmm0,%xmm0
mulsd  %xmm1,%xmm1
addsd  %xmm0,%xmm1
movsd  0x10(%rsi),%xmm0
mulsd  %xmm0,%xmm0
addsd  %xmm1,%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     116c <vec2pix_nest+0x3c>
sqrtsd %xmm0,%xmm0
jmp    1171 <vec2pix_nest+0x41>
call   1050 <sqrt@plt>
movsd  0x10(%rbx),%xmm1
divsd  %xmm0,%xmm1
movsd  %xmm1,(%rsp)
movsd  (%rbx),%xmm1
movsd  0x8(%rbx),%xmm0
call   1040 <atan2@plt>
mov    %r14,%rdi
movsd  (%rsp),%xmm0
mov    %eax,%esi
add    $0x8,%rsp
pop    %rbx
pop    %r14
jmp    1030 <ang2pix_nest_z_phi@plt>

LLVM IR (-O0):
define i32 @vec2pix_nest(i64 %0, double* %1) {
%3 = alloca i64
%4 = alloca double*
%5 = alloca double
store i64 %0, i64* %3
store double* %1, double** %4
%6 = load double*, double** %4
%7 = getelementptr inbounds double, double* %6, i64 0
%8 = load double, double* %7
%9 = load double*, double** %4
%10 = getelementptr inbounds double, double* %9, i64 0
%11 = load double, double* %10
%12 = load double*, double** %4
%13 = getelementptr inbounds double, double* %12, i64 1
%14 = load double, double* %13
%15 = load double*, double** %4
%16 = getelementptr inbounds double, double* %15, i64 1
%17 = load double, double* %16
%18 = fmul double %14, %17
%19 = call double @llvm.fmuladd.f64(double %8, double %11, double %18)
%20 = load double*, double** %4
%21 = getelementptr inbounds double, double* %20, i64 2
%22 = load double, double* %21
%23 = load double*, double** %4
%24 = getelementptr inbounds double, double* %23, i64 2
%25 = load double, double* %24
%26 = call double @llvm.fmuladd.f64(double %22, double %25, double %19)
%27 = call double @sqrt(double %26)
store double %27, double* %5
%28 = load i64, i64* %3
%29 = load double*, double** %4
%30 = getelementptr inbounds double, double* %29, i64 2
%31 = load double, double* %30
%32 = load double, double* %5
%33 = fdiv double %31, %32
%34 = load double*, double** %4
%35 = getelementptr inbounds double, double* %34, i64 1
%36 = load double, double* %35
%37 = load double*, double** %4
%38 = getelementptr inbounds double, double* %37, i64 0
%39 = load double, double* %38
%40 = call i32 @atan2(double %36, double %39)
%41 = call i32 @ang2pix_nest_z_phi(i64 %28, double %33, i32 %40)
ret i32 %41
}

LLVM IR (-O2):
define i32 @vec2pix_nest(i64 %0, double* nocapture %1) {
%3 = load double, double* %1
%4 = getelementptr inbounds double, double* %1, i64 1
%5 = load double, double* %4
%6 = fmul double %5, %5
%7 = tail call double @llvm.fmuladd.f64(double %3, double %3, double %6)
%8 = getelementptr inbounds double, double* %1, i64 2
%9 = load double, double* %8
%10 = tail call double @llvm.fmuladd.f64(double %9, double %9, double %7)
%11 = tail call double @sqrt(double %10)
%12 = load double, double* %8
%13 = fdiv double %12, %11
%14 = load double, double* %4
%15 = load double, double* %1
%16 = tail call i32 @atan2(double %14, double %15)
%17 = tail call i32 @ang2pix_nest_z_phi(i64 %0, double %13, i32 %16)
ret i32 %17
}