// File: /workspace/github_c_makefile_star2_O2/PoulinV[P]AxiCLASS/build/../source/input.c
// Function: input_find_root
int input_find_root(double *xzero,
                    int *fevals,
                    double tol_x_rel,
                    struct fzerofun_workspace *pfzw,
                    ErrorMsg errmsg){

  /** Summary: */

  /** Define local variables */
  double x1, x2, f1, f2, dxdy, dx;
  int iter, iter2;
  int return_function;

  /** Fisrt we do our guess */
  class_call(input_get_guess(&x1, &dxdy, pfzw, errmsg),
             errmsg,
             errmsg);

  class_call(input_fzerofun_1d(x1, pfzw, &f1, errmsg),
             errmsg,
             errmsg);

  (*fevals)++;
  dx = 1.5*f1*dxdy;

  /** Then we do a linear hunt for the boundaries */
  /* Try fifteen times to go above and below the root (i.e. where shooting succeeds) */
  for (iter=1; iter<=150; iter++){ //vp:default iter max is 15. We increase it to a large number to make sure shooting does not fail for axion.
    x2 = x1 - dx;
    /* Try three times to get a 'reasonable' value, i.e. no CLASS error */
    for (iter2=1; iter2 <= 3; iter2++) {
      return_function = input_fzerofun_1d(x2, pfzw, &f2, errmsg);
      (*fevals)++;
      if (return_function ==_SUCCESS_) {
        break;
      }
      else if (iter2 < 3) {
        dx*=0.5;
        x2 = x1-dx;
      }
      else {
        class_stop(errmsg,errmsg);
      }
    }
    if (f1*f2<0.0){
      /* Root has been bracketed */
      break;
    }
    x1 = x2;
    f1 = f2;
  }
  // printf("here x1 %e x2 %e f1 %e f2 %e!!\n",x1,x2,f1,f2);
  /** Find root using Ridders method (Exchange for bisection if you are old-school) */
  class_call(input_fzero_ridder(input_fzerofun_1d,
                                x1,
                                x2,
                                tol_x_rel*MAX(fabs(x1),fabs(x2)),
                                pfzw,
                                &f1,
                                &f2,
                                xzero,
                                fevals,
                                errmsg),
             errmsg,errmsg);
   // printf("here xzero %e!!\n",xzero);

  return _SUCCESS_;

}

// Assembly:
pushq %rbp
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rbx
subq $0x1078, %rsp           # imm = 0x1078
movq %rcx, %rbx
movq %rdx, %r12
movsd %xmm0, 0x18(%rsp)
movq %rsi, %r14
movq %rdi, %r15
leaq 0x58(%rsp), %rdi
leaq 0x50(%rsp), %rsi
callq 0x39b61
testl %eax, %eax
je 0x39933
leaq 0xabaee(%rip), %rsi     # 0xe53f0
leaq 0xb1986(%rip), %rdx     # 0xeb28f
leaq 0x70(%rsp), %r14
movq %r14, %rdi
movq %rbx, %rcx
xorl %eax, %eax
callq 0x2e014
leaq 0xab712(%rip), %rsi     # 0xe5034
leaq 0xb1990(%rip), %rdx     # 0xeb2b9
movq %rbx, %rdi
movl $0x4c4, %ecx            # imm = 0x4C4
jmp 0x39989
movsd 0x58(%rsp), %xmm0
leaq 0x10(%rsp), %rsi
movapd %xmm0, 0x30(%rsp)
movq %r12, %rdi
movq %rbx, %rdx
callq 0x3c1e4
testl %eax, %eax
je 0x399a8
leaq 0xaba96(%rip), %rsi     # 0xe53f0
leaq 0xb1968(%rip), %rdx     # 0xeb2c9
leaq 0x70(%rsp), %r14
movq %r14, %rdi
movq %rbx, %rcx
xorl %eax, %eax
callq 0x2e014
leaq 0xab6ba(%rip), %rsi     # 0xe5034
leaq 0xb1938(%rip), %rdx     # 0xeb2b9
movq %rbx, %rdi
movl $0x4c8, %ecx            # imm = 0x4C8
movq %r14, %r8
xorl %eax, %eax
callq 0x2e014
pushq $0x1
popq %rax
addq $0x1078, %rsp           # imm = 0x1078
popq %rbx
popq %r12
popq %r13
popq %r14
popq %r15
popq %rbp
retq
movq %r15, 0x40(%rsp)
incl (%r14)
movsd 0x10(%rsp), %xmm3
movsd 0xae5ca(%rip), %xmm2    # 0xe7f88
mulsd %xmm3, %xmm2
mulsd 0x50(%rsp), %xmm2
pushq $0x1
popq %rbp
pushq $0x2
popq %r15
leaq 0x28(%rsp), %r13
movsd 0x18(%rsp), %xmm4
movapd 0x30(%rsp), %xmm0
cmpl $0x97, %ebp
je 0x39ad8
movsd %xmm3, 0x48(%rsp)
movapd %xmm0, 0x30(%rsp)
movsd %xmm2, 0x20(%rsp)
subsd %xmm2, %xmm0
movapd %xmm0, 0x60(%rsp)
movq %r12, %rdi
movq %r13, %rsi
movq %rbx, %rdx
callq 0x3c1e4
incl (%r14)
testl %eax, %eax
je 0x39a39
subl $0x1, %r15d
jb 0x39a82
movsd 0x20(%rsp), %xmm2
mulsd 0xac27f(%rip), %xmm2    # 0xe5cb0
movapd 0x30(%rsp), %xmm0
jmp 0x399f8
movapd 0x60(%rsp), %xmm2
movsd 0x28(%rsp), %xmm0
movsd 0x48(%rsp), %xmm1
mulsd %xmm0, %xmm1
xorpd %xmm3, %xmm3
ucomisd %xmm1, %xmm3
movsd 0x18(%rsp), %xmm4
ja 0x39ace
movsd %xmm0, 0x10(%rsp)
incl %ebp
movapd %xmm0, %xmm3
movapd %xmm2, %xmm1
movapd %xmm2, %xmm0
movsd 0x20(%rsp), %xmm2
pushq $0x2
popq %r15
jmp 0x399e0
leaq 0x70(%rsp), %r14
movq %r14, %rdi
movq %rbx, %rsi
xorl %eax, %eax
callq 0x2e014
leaq 0xabaea(%rip), %rsi     # 0xe5585
leaq 0x870(%rsp), %r15
movq %r15, %rdi
movq %r14, %rdx
xorl %eax, %eax
callq 0x2e014
leaq 0xab57d(%rip), %rsi     # 0xe5034
leaq 0xb17fb(%rip), %rdx     # 0xeb2b9
movq %rbx, %rdi
movl $0x4dd, %ecx            # imm = 0x4DD
movq %r15, %r8
jmp 0x3998c
movapd 0x30(%rsp), %xmm0
movapd %xmm2, %xmm1
movapd 0xab760(%rip), %xmm2    # 0xe5240
movapd %xmm0, %xmm3
andpd %xmm2, %xmm3
andpd %xmm1, %xmm2
maxsd %xmm3, %xmm2
mulsd %xmm4, %xmm2
movq %rbx, (%rsp)
leaq 0x26e5(%rip), %rdi      # 0x3c1e4
leaq 0x10(%rsp), %rdx
leaq 0x28(%rsp), %rcx
movq %r12, %rsi
movq 0x40(%rsp), %r8
movq %r14, %r9
callq 0x3c266
movl %eax, %ecx
xorl %eax, %eax
cmpl $0x1, %ecx
jne 0x39996
leaq 0xab8c3(%rip), %rsi     # 0xe53f0
leaq 0xb17be(%rip), %rdx     # 0xeb2f2
leaq 0x70(%rsp), %r14
movq %r14, %rdi
movq %rbx, %rcx
xorl %eax, %eax
callq 0x2e014
leaq 0xab4e7(%rip), %rsi     # 0xe5034
leaq 0xb1765(%rip), %rdx     # 0xeb2b9
movq %rbx, %rdi
movl $0x4f3, %ecx            # imm = 0x4F3
jmp 0x39989