user: 请从给定的汇编指令推导出C源代码：

```asm
<findpH>:
  endbr64
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  xor    %ebx,%ebx
  sub    $0x58,%rsp
  movsd  %xmm2,0x8(%rsp)
  movapd %xmm3,%xmm2
  movapd %xmm4,%xmm3
  movapd %xmm5,%xmm4
  movsd  %xmm6,0x38(%rsp)
  movapd %xmm6,%xmm5
  movsd  %xmm4,0x30(%rsp)
  movsd  %xmm3,0x28(%rsp)
  movsd  %xmm2,0x20(%rsp)
  movsd  %xmm1,0x18(%rsp)
  movsd  %xmm0,0x10(%rsp)
  call   *%rdi
  movsd  0x10(%rsp),%xmm7
  movsd  D26(%rip),%xmm6
  subsd  0x8(%rsp),%xmm0
  movsd  0x18(%rsp),%xmm1
  addsd  %xmm7,%xmm6
  movsd  0x20(%rsp),%xmm2
  movsd  0x28(%rsp),%xmm3
  movsd  0x30(%rsp),%xmm4
  movsd  0x38(%rsp),%xmm5
  movapd %xmm0,%xmm8
  movapd %xmm7,%xmm0
  subsd  %xmm6,%xmm0
  andpd  D27(%rip),%xmm0
  comisd D41(%rip),%xmm0
  ja     L56
  jmp    L36
  nopl   0x0(%rax)
L61:
  movsd  D75(%rip),%xmm6
  pxor   %xmm0,%xmm0
  addsd  %xmm7,%xmm6
  comisd %xmm6,%xmm0
  ja     L54
L27:
  movsd  D44(%rip),%xmm0
  minsd  %xmm6,%xmm0
  movapd %xmm0,%xmm6
L97:
  movsd  %xmm7,0x18(%rsp)
  movapd %xmm6,%xmm0
  movsd  %xmm6,0x10(%rsp)
  movsd  %xmm5,0x40(%rsp)
  movsd  %xmm4,0x38(%rsp)
  movsd  %xmm3,0x30(%rsp)
  movsd  %xmm2,0x28(%rsp)
  movsd  %xmm1,0x20(%rsp)
  call   *%rbp
  subsd  0x8(%rsp),%xmm0
  movsd  0x10(%rsp),%xmm6
  movsd  0x18(%rsp),%xmm7
  movapd %xmm0,%xmm8
  movapd %xmm6,%xmm0
  subsd  %xmm7,%xmm0
  andpd  D27(%rip),%xmm0
  comisd D41(%rip),%xmm0
  jbe    L83
  cmp    $0x33,%ebx
  movsd  0x20(%rsp),%xmm1
  movsd  0x28(%rsp),%xmm2
  movsd  0x30(%rsp),%xmm3
  movsd  0x38(%rsp),%xmm4
  movsd  0x40(%rsp),%xmm5
  je     L87
  movapd %xmm6,%xmm7
L56:
  pxor   %xmm6,%xmm6
  add    $0x1,%ebx
  ucomisd %xmm6,%xmm7
  jp     L91
  mov    D41(%rip),%rax
  movq   %rax,%xmm0
  je     L120
L91:
  movsd  D41(%rip),%xmm0
  mulsd  %xmm7,%xmm0
L120:
  movapd %xmm7,%xmm9
  movsd  %xmm8,0x48(%rsp)
  subsd  %xmm0,%xmm9
  movsd  %xmm7,0x40(%rsp)
  movsd  %xmm5,0x38(%rsp)
  movsd  %xmm4,0x30(%rsp)
  movsd  %xmm3,0x28(%rsp)
  movapd %xmm9,%xmm0
  movsd  %xmm2,0x20(%rsp)
  movsd  %xmm1,0x18(%rsp)
  movsd  %xmm9,0x10(%rsp)
  call   *%rbp
  movsd  0x48(%rsp),%xmm8
  movsd  0x40(%rsp),%xmm7
  pxor   %xmm2,%xmm2
  movapd %xmm0,%xmm6
  subsd  0x8(%rsp),%xmm6
  movsd  0x10(%rsp),%xmm9
  movapd %xmm8,%xmm0
  movsd  0x18(%rsp),%xmm1
  movsd  0x28(%rsp),%xmm3
  movsd  0x30(%rsp),%xmm4
  movsd  0x38(%rsp),%xmm5
  subsd  %xmm6,%xmm0
  movapd %xmm7,%xmm6
  subsd  %xmm9,%xmm6
  divsd  %xmm6,%xmm0
  ucomisd %xmm2,%xmm0
  movsd  0x20(%rsp),%xmm2
  jp     L119
  je     L61
L119:
  divsd  %xmm0,%xmm8
  movapd %xmm7,%xmm6
  pxor   %xmm0,%xmm0
  subsd  %xmm8,%xmm6
  comisd %xmm6,%xmm0
  jbe    L27
L54:
  pxor   %xmm6,%xmm6
  jmp    L97
  nopl   0x0(%rax,%rax,1)
L83:
  cmp    $0x31,%ebx
  jg     L87
L75:
  add    $0x58,%rsp
  movapd %xmm6,%xmm0
  pop    %rbx
  pop    %rbp
  ret
L87:
  movsd  D62(%rip),%xmm6
  add    $0x58,%rsp
  pop    %rbx
  pop    %rbp
  movapd %xmm6,%xmm0
  ret
L36:
  movapd %xmm7,%xmm6
  jmp    L75
```

tool_calls: name: parse_data
arguments: data_tag: D26
data_type: byte[8]
name: parse_data
arguments: data_tag: D27
data_type: qword[2]
name: parse_data
arguments: data_tag: D41
data_type: byte[16]
name: parse_data
arguments: data_tag: D75
data_type: byte[8]
name: parse_data
arguments: data_tag: D44
data_type: byte[8]
name: parse_data
arguments: data_tag: D62
data_type: byte[8]

tool: {"D26": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

tool: {"D27": [0x7fffffffffffffff,0x0000000000000000]}

tool: {"D41": [0xfc,0xa9,0xf1,0xd2,0x4d,0x62,0x50,0x3f,0x00,0x00,0x00,0x00,0x00,0x00,0x2c,0x40]}

tool: {"D75": [0x2f,0x6e,0xa3,0x01,0xbc,0x05,0x52,0x3f]}

tool: {"D44": [0x00,0x00,0x00,0x00,0x00,0x00,0x2c,0x40]}

tool: {"D62": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0xbf]}

assistant: ```c
double findpH(double (*fcnHndl)(double, double, double, double, double, double), double pH0, double Var1, double Var2, double K1, double K2, double Kw, double f) {
  double pHa, fnka, df, dpH;
  double tol = 1e-3;
  int iter = 0;
  int itermax = 50;
  double fnk = (*fcnHndl)(pH0, Var1, K1, K2, Kw, f) - Var2;
  double pH = pH0;
  pH0 = pH + 1;
  while ((fabs(pH - pH0) > tol) && (iter <= itermax)) {
    iter = iter + 1;
    pH0 = pH;
    if (pH != 0) {
      dpH = pH * tol;
    } else {
      dpH = tol;
    }
    pHa = pH - dpH;
    fnka = (*fcnHndl)(pHa, Var1, K1, K2, Kw, f) - Var2;
    df = (fnk - fnka) / (pH - pHa);
    if (df == 0) {
      pH = pH0 + 1.1 * tol;
    } else {
      pH = pH0 - fnk / df;
    }
    if (pH < 0) {
      pH = 0;
    }
    if (pH > 14) {
      pH = 14;
    }
    fnk = (*fcnHndl)(pH, Var1, K1, K2, Kw, f) - Var2;
  }
  if (iter >= itermax) {
    pH = -1;
  }
  return pH;
}
```