user: Please show me the C implementation that matches the assembly code listed below:

```asm
<rkFehlbergStep>:
  endbr64
  push   %r14
  mov    %edx,%r14d
  push   %r13
  mov    %rcx,%r13
  push   %r12
  mov    %r8,%r12
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x50,%rsp
  movsd  %xmm2,0x10(%rsp)
  movsd  %xmm1,0x18(%rsp)
  movsd  %xmm0,0x8(%rsp)
  call   *%rdi
  movsd  0x10(%rsp),%xmm2
  movsd  0x18(%rsp),%xmm3
  movapd %xmm0,%xmm7
  movsd  0x8(%rsp),%xmm0
  mulsd  %xmm2,%xmm7
  movapd %xmm2,%xmm4
  movsd  %xmm2,0x28(%rsp)
  movapd %xmm3,%xmm1
  mulsd  D44(%rip),%xmm4
  movsd  %xmm7,0x10(%rsp)
  movsd  %xmm4,0x20(%rsp)
  call   *%rbp
  movsd  0x20(%rsp),%xmm4
  movsd  0x18(%rsp),%xmm3
  movapd %xmm0,%xmm1
  mulsd  %xmm4,%xmm1
  addsd  0x8(%rsp),%xmm4
  movsd  %xmm3,0x20(%rsp)
  mulsd  0x10(%rsp),%xmm1
  movapd %xmm4,%xmm0
  addsd  %xmm3,%xmm1
  call   *%rbx
  movsd  0x28(%rsp),%xmm2
  movsd  D17(%rip),%xmm4
  movsd  0x20(%rsp),%xmm3
  mulsd  %xmm2,%xmm0
  mulsd  %xmm2,%xmm4
  movapd %xmm3,%xmm1
  movsd  %xmm3,0x30(%rsp)
  movsd  %xmm0,0x18(%rsp)
  movsd  0x10(%rsp),%xmm0
  mulsd  %xmm4,%xmm0
  movapd %xmm0,%xmm4
  movsd  0x8(%rsp),%xmm0
  addsd  %xmm3,%xmm4
  movsd  %xmm4,0x20(%rsp)
  call   *%rbp
  movsd  0x28(%rsp),%xmm2
  movsd  D187(%rip),%xmm1
  movsd  D148(%rip),%xmm3
  mulsd  %xmm2,%xmm1
  mulsd  %xmm2,%xmm3
  mulsd  %xmm0,%xmm1
  movsd  0x8(%rsp),%xmm0
  mulsd  0x18(%rsp),%xmm1
  addsd  0x20(%rsp),%xmm1
  addsd  %xmm3,%xmm0
  call   *%rbx
  movsd  0x28(%rsp),%xmm2
  movsd  D5(%rip),%xmm4
  movsd  0x30(%rsp),%xmm3
  mulsd  %xmm2,%xmm0
  movapd %xmm2,%xmm1
  movsd  %xmm2,0x30(%rsp)
  mulsd  %xmm2,%xmm4
  movsd  %xmm3,0x38(%rsp)
  mulsd  D12(%rip),%xmm1
  mulsd  0x18(%rsp),%xmm1
  movsd  %xmm0,0x20(%rsp)
  movsd  0x10(%rsp),%xmm0
  mulsd  %xmm4,%xmm0
  addsd  %xmm3,%xmm0
  movapd %xmm0,%xmm4
  movsd  0x8(%rsp),%xmm0
  subsd  %xmm1,%xmm4
  movapd %xmm3,%xmm1
  movsd  %xmm4,0x28(%rsp)
  call   *%rbp
  movsd  0x30(%rsp),%xmm2
  movsd  D181(%rip),%xmm1
  movsd  D37(%rip),%xmm3
  mulsd  %xmm2,%xmm1
  mulsd  %xmm2,%xmm3
  mulsd  %xmm0,%xmm1
  movsd  0x8(%rsp),%xmm0
  mulsd  D178(%rip),%xmm1
  addsd  0x28(%rsp),%xmm1
  addsd  %xmm3,%xmm0
  call   *%rbx
  movsd  0x30(%rsp),%xmm2
  movsd  D144(%rip),%xmm3
  movapd %xmm0,%xmm4
  movsd  0x10(%rsp),%xmm0
  movsd  D140(%rip),%xmm1
  mulsd  %xmm2,%xmm3
  mulsd  %xmm2,%xmm1
  mulsd  0x18(%rsp),%xmm1
  mulsd  %xmm2,%xmm4
  mulsd  %xmm3,%xmm0
  movsd  0x38(%rsp),%xmm3
  movsd  %xmm4,0x28(%rsp)
  addsd  %xmm3,%xmm0
  subsd  %xmm1,%xmm0
  movsd  D157(%rip),%xmm1
  mulsd  %xmm2,%xmm1
  mulsd  0x20(%rsp),%xmm1
  addsd  %xmm1,%xmm0
  movapd %xmm3,%xmm1
  movsd  %xmm0,0x40(%rsp)
  movsd  0x8(%rsp),%xmm0
  call   *%rbp
  movsd  0x30(%rsp),%xmm2
  pxor   %xmm3,%xmm3
  movsd  0x8(%rsp),%xmm5
  movapd %xmm0,%xmm1
  movsd  0x40(%rsp),%xmm4
  mulsd  %xmm2,%xmm3
  addsd  %xmm2,%xmm5
  movapd %xmm3,%xmm0
  mulsd  %xmm1,%xmm0
  movapd %xmm4,%xmm1
  mulsd  0x28(%rsp),%xmm0
  subsd  %xmm0,%xmm1
  movapd %xmm5,%xmm0
  call   *%rbx
  movsd  0x30(%rsp),%xmm2
  movsd  D119(%rip),%xmm1
  movsd  0x38(%rsp),%xmm3
  mulsd  %xmm2,%xmm1
  movsd  %xmm2,0x38(%rsp)
  mulsd  %xmm2,%xmm0
  movapd %xmm3,%xmm9
  movsd  %xmm3,0x40(%rsp)
  mulsd  0x10(%rsp),%xmm1
  movsd  %xmm0,0x30(%rsp)
  subsd  %xmm1,%xmm9
  movapd %xmm2,%xmm1
  addsd  %xmm2,%xmm1
  mulsd  0x18(%rsp),%xmm1
  movapd %xmm9,%xmm0
  addsd  %xmm1,%xmm0
  movsd  D109(%rip),%xmm1
  mulsd  %xmm2,%xmm1
  mulsd  0x20(%rsp),%xmm1
  subsd  %xmm1,%xmm0
  movapd %xmm2,%xmm1
  mulsd  D98(%rip),%xmm1
  mulsd  0x28(%rsp),%xmm1
  addsd  %xmm1,%xmm0
  movapd %xmm3,%xmm1
  movsd  %xmm0,0x48(%rsp)
  movsd  0x8(%rsp),%xmm0
  call   *%rbp
  movsd  0x38(%rsp),%xmm2
  movsd  0x8(%rsp),%xmm5
  movsd  D156(%rip),%xmm10
  movapd %xmm0,%xmm1
  movsd  0x48(%rsp),%xmm4
  mulsd  %xmm2,%xmm10
  movapd %xmm10,%xmm0
  mulsd  %xmm1,%xmm0
  movsd  D21(%rip),%xmm1
  mulsd  0x30(%rsp),%xmm0
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm5
  movapd %xmm4,%xmm1
  subsd  %xmm0,%xmm1
  movapd %xmm5,%xmm0
  call   *%rbx
  pxor   %xmm1,%xmm1
  movsd  0x38(%rsp),%xmm2
  pxor   %xmm7,%xmm7
  cvtsi2sd %r14d,%xmm1
  movsd  0x40(%rsp),%xmm3
  mulsd  0x18(%rsp),%xmm7
  pxor   %xmm6,%xmm6
  mulsd  %xmm2,%xmm0
  mulsd  %xmm2,%xmm1
  addsd  0x8(%rsp),%xmm1
  mulsd  %xmm6,%xmm0
  movsd  %xmm1,0x0(%r13)
  movsd  0x10(%rsp),%xmm1
  mulsd  D41(%rip),%xmm1
  addsd  %xmm3,%xmm1
  movsd  0x20(%rsp),%xmm3
  mulsd  D104(%rip),%xmm3
  addsd  %xmm7,%xmm1
  addsd  %xmm3,%xmm1
  movsd  0x28(%rsp),%xmm3
  mulsd  D169(%rip),%xmm3
  addsd  %xmm3,%xmm1
  movsd  0x30(%rsp),%xmm3
  mulsd  D114(%rip),%xmm3
  subsd  %xmm3,%xmm1
  addsd  %xmm0,%xmm1
  movsd  %xmm1,(%r12)
  add    $0x50,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  ret
```

tool_calls: name: read_data
arguments: label: D44
type: f32[2]
name: read_data
arguments: label: D17
type: f32[2]
name: read_data
arguments: label: D187
type: f32[2]
name: read_data
arguments: label: D148
type: f32[2]
name: read_data
arguments: label: D5
type: byte[8]
name: read_data
arguments: label: D12
type: byte[8]
name: read_data
arguments: label: D181
type: byte[8]
name: read_data
arguments: label: D37
type: byte[8]
name: read_data
arguments: label: D178
type: f32[2]
name: read_data
arguments: label: D144
type: byte[8]
name: read_data
arguments: label: D140
type: f64
name: read_data
arguments: label: D157
type: byte[8]
name: read_data
arguments: label: D119
type: byte[8]
name: read_data
arguments: label: D109
type: byte[8]
name: read_data
arguments: label: D98
type: byte[8]
name: read_data
arguments: label: D156
type: byte[8]
name: read_data
arguments: label: D21
type: f32[2]
name: read_data
arguments: label: D41
type: byte[8]
name: read_data
arguments: label: D104
type: byte[8]
name: read_data
arguments: label: D169
type: byte[8]
name: read_data
arguments: label: D114
type: byte[8]

tool: {"D44": [0.0,1.625]}

tool: {"D17": [0.0,1.4375]}

tool: {"D187": [0.0,1.640625]}

tool: {"D148": [0.0,1.6875]}

tool: {"D5": [0x4c,0x61,0x89,0x91,0xe3,0x23,0xec,0x3f]}

tool: {"D12": [0x3c,0xbd,0x08,0xa1,0xb2,0x37,0x0a,0x40]}

tool: {"D181": [0x10,0xdb,0x08,0xe4,0x2f,0x91,0x0a,0x40]}

tool: {"D37": [0x9e,0xd8,0x89,0x9d,0xd8,0x89,0xed,0x3f]}

tool: {"D178": [0.0,0.0]}

tool: {"D144": [0x26,0xb4,0x97,0xd0,0x5e,0x42,0x00,0x40]}

tool: D140: 8

tool: {"D157": [0x1a,0xcb,0x69,0x2c,0xa7,0xb1,0x1c,0x40]}

tool: {"D119": [0x68,0x2f,0xa1,0xbd,0x84,0xf6,0xd2,0x3f]}

tool: {"D109": [0xb6,0x61,0x09,0xba,0x58,0x1b,0xf6,0x3f]}

tool: {"D98": [0xd8,0x4f,0x60,0x3f,0x81,0xfd,0xdc,0x3f]}

tool: {"D156": [0x9a,0x99,0x99,0x99,0x99,0x99,0xd1,0x3f]}

tool: {"D21": [0.0,1.75]}

tool: {"D41": [0x13,0xda,0x4b,0x68,0x2f,0xa1,0xbd,0x3f]}

tool: {"D104": [0x0d,0x19,0x01,0x31,0xd1,0x90,0xe1,0x3f]}

tool: {"D169": [0x17,0xd2,0x5b,0x48,0x6f,0x21,0xe1,0x3f]}

tool: {"D114": [0x9a,0x99,0x99,0x99,0x99,0x99,0xc9,0x3f]}

assistant: ```c
void rkFehlbergStep(double (*f)(double, double), double (*fy)(double, double), double t0, double y0, double h, int i, double *t, double *y) {
  double k1, k2, k3, k4, k5, k6;
  k1 = h * (*f)(t0, y0);
  k2 = h * (*f)(t0 + 1.0 / 4.0 * h, y0 + 1.0 / 4.0 * h * (*fy)(t0, y0) * k1);
  k3 = h * (*f)(t0 + 3.0 / 8.0 * h, y0 + 3.0 / 32.0 * h * k1 + 9.0 / 32.0 * h * (*fy)(t0, y0) * k2);
  k4 = h * (*f)(t0 + 12.0 / 13.0 * h, y0 + 1932.0 / 2197.0 * h * k1 - 7200.0 / 2197.0 * h * k2 + 7296.0 / 2197.0 * h * (*fy)(t0, y0) * k4);
  k5 = h * (*f)(t0 + 1.0 * h, y0 + 439.0 / 216.0 * h * k1 - 8.0 * h * k2 + 3680.0 / 513.0 * h * k3 - 845 / 4104 * h * (*fy)(t0, y0) * k4);
  k6 = h * (*f)(t0 - 1.0 / 2.0 * h, y0 - 8.0 / 27.0 * h * k1 + 2.0 * h * k2 - 3544.0 / 2565.0 * h * k3 + 1859.0 / 4104.0 * h * k4 - 11.0 / 40.0 * h * (*fy)(t0, y0) * k5);
  *t = t0 + h * i;
  *y = y0 + 25.0 / 216.0 * k1 + 0.0 * k2 + 1408.0 / 2565.0 * k3 + 2197.0 / 4104.0 * k4 - 1.0 / 5.0 * k5 + 0.0 * k6;
}
```