user: What would the C source look like for the assembly code provided here?

```asm
<matinv>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rcx,0x18(%rsp)
  test   %esi,%esi
  jle    L175
  mov    %rdi,%r12
  movslq %edx,%rax
  movq   D27(%rip),%xmm4
  xor    %ebx,%ebx
  lea    0x8(,%rax,8),%rdi
  mov    %rax,0x38(%rsp)
  mov    %esi,%r8d
  mov    %edx,%r13d
  lea    0x0(,%rax,8),%rbp
  lea    0x8(%r12),%rax
  mov    %rdi,0x48(%rsp)
  xor    %r15d,%r15d
  mov    %rax,%rdi
  mov    %rax,0x40(%rsp)
  lea    -0x1(%rdx),%eax
  movsd  D2(%rip),%xmm6
  lea    (%rdi,%rax,8),%r11
  lea    -0x1(%rsi),%eax
  mov    %r12,0x8(%rsp)
  movsd  D14(%rip),%xmm8
  mov    %rax,0x50(%rsp)
  mov    %esi,%eax
  movq   D10(%rip),%xmm5
  pxor   %xmm7,%xmm7
  mov    %rax,0x58(%rsp)
  mov    %r12,0x10(%rsp)
  nopl   0x0(%rax)
L15:
  mov    0x8(%rsp),%rdx
  mov    0x18(%rsp),%rsi
  mov    %ebx,%r9d
  mov    %ebx,%ecx
  mov    %ebx,%eax
  movapd %xmm7,%xmm1
  nopl   (%rax)
L20:
  movsd  (%rdx),%xmm0
  andpd  %xmm4,%xmm0
  comisd %xmm1,%xmm0
  jbe    L3
  mov    %eax,(%rsi,%rbx,4)
  movapd %xmm0,%xmm1
L3:
  add    $0x1,%eax
  add    %rbp,%rdx
  cmp    %eax,%r8d
  jg     L20
  comisd %xmm1,%xmm6
  ja     L137
  mov    0x18(%rsp),%rax
  mov    %ebx,%r14d
  mov    (%rax,%rbx,4),%edx
  cmp    %ebx,%edx
  jne    L60
L171:
  mov    %rbx,0x20(%rsp)
  mov    0x8(%rsp),%rax
  xor    %edi,%edi
  xor    %esi,%esi
  mov    %r11,0x30(%rsp)
  mov    0x50(%rsp),%rbx
  movapd %xmm8,%xmm3
  mov    0x40(%rsp),%r11
  mov    %rbp,0x28(%rsp)
  mov    %r9d,%ebp
  divsd  (%rax),%xmm3
  nopl   0x0(%rax,%rax,1)
L56:
  cmp    %r14d,%esi
  je     L28
  lea    (%rdi,%rbp,1),%eax
  movslq %edi,%r9
  cltq
  lea    (%r9,%rbx,1),%rdx
  lea    (%r12,%rax,8),%r10
  lea    (%r11,%rdx,8),%rcx
  mov    %r15,%rdx
  movsd  (%r10),%xmm2
  lea    (%r12,%r9,8),%rax
  sub    %r9,%rdx
  mulsd  %xmm3,%xmm2
  nopl   0x0(%rax)
L138:
  movsd  (%rax,%rdx,8),%xmm1
  movsd  (%rax),%xmm0
  add    $0x8,%rax
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x8(%rax)
  cmp    %rax,%rcx
  jne    L138
  xorpd  %xmm5,%xmm2
  movsd  %xmm2,(%r10)
L28:
  lea    0x1(%rsi),%eax
  add    %r13d,%edi
  cmp    %eax,%r8d
  je     L164
  movslq %eax,%rsi
  jmp    L56
L164:
  mov    0x20(%rsp),%rbx
  mov    0x28(%rsp),%rbp
  mov    0x30(%rsp),%r11
  mov    0x10(%rsp),%rax
  test   %r13d,%r13d
  jle    L87
  nopl   0x0(%rax)
L40:
  movsd  (%rax),%xmm0
  add    $0x8,%rax
  mulsd  %xmm3,%xmm0
  movsd  %xmm0,-0x8(%rax)
  cmp    %r11,%rax
  jne    L40
L87:
  mov    0x8(%rsp),%rax
  mov    0x48(%rsp),%rdi
  add    $0x1,%rbx
  add    %rbp,%r11
  add    %rbp,0x10(%rsp)
  add    0x38(%rsp),%r15
  movsd  %xmm3,(%rax)
  add    %rdi,%rax
  mov    %rax,0x8(%rsp)
  cmp    0x58(%rsp),%rbx
  jne    L15
  mov    0x38(%rsp),%rdi
  mov    0x18(%rsp),%r10
  lea    (%r12,%rsi,8),%r9
  shl    $0x3,%rdi
  nopw   0x0(%rax,%rax,1)
L38:
  movslq (%r10,%rsi,4),%rcx
  cmp    %esi,%ecx
  je     L10
  mov    %r9,%rax
  xor    %edx,%edx
  sub    %rsi,%rcx
L144:
  movsd  (%rax),%xmm0
  movsd  (%rax,%rcx,8),%xmm1
  add    $0x1,%edx
  movsd  %xmm1,(%rax)
  movsd  %xmm0,(%rax,%rcx,8)
  add    %rdi,%rax
  cmp    %edx,%r8d
  jne    L144
L10:
  sub    $0x1,%rsi
  sub    $0x8,%r9
  test   %esi,%esi
  jns    L38
L175:
  add    $0x68,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L60:
  test   %r13d,%r13d
  jle    L171
  imul   %r13d,%edx
  mov    0x10(%rsp),%rax
  movslq %edx,%rdx
  sub    %r15,%rdx
  nopw   0x0(%rax,%rax,1)
L161:
  movsd  (%rax),%xmm0
  movsd  (%rax,%rdx,8),%xmm1
  movsd  %xmm1,(%rax)
  movsd  %xmm0,(%rax,%rdx,8)
  add    $0x8,%rax
  cmp    %r11,%rax
  jne    L161
  jmp    L171
L137:
  lea    0x1(%rcx),%esi
  lea    D31(%rip),%rdi
  call   <printf@plt>
  add    $0x68,%rsp
  mov    $0xffffffff,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: read_data
arguments: tag: D27
datatype: qword
name: read_data
arguments: tag: D2
datatype: byte[8]
name: read_data
arguments: tag: D14
datatype: f64
name: read_data
arguments: tag: D10
datatype: f32[2]
name: read_data
arguments: tag: D31
datatype: string

tool: D27: 9223372036854775807

tool: {"D2": [0x23,0x42,0x92,0x0c,0xa1,0x9c,0xc7,0x3b]}

tool: D14: 1

tool: {"D10": [0.0,-0.0]}

tool: D31: 
Det becomes zero at %3d!	


assistant: ```c
int matinv(double x[], int n, int m, double space[]) {
  register int i, j, k;
  int *irow = (int *)space;
  double ee = 1.0e-20, t, t1, xmax;
  double det = 1.0;
  for (i = 0; i < n; i++) {
    xmax = 0.;
    for (j = i; j < n; j++) {
      if (xmax < fabs(x[j * m + i])) {
        xmax = fabs(x[j * m + i]);
        irow[i] = j;
      }
    }
    det *= xmax;
    if (xmax < ee) {
      printf("\nDet becomes zero at %3d!\t\n", i + 1);
      return (-1);
    }
    if (irow[i] != i) {
      for (j = 0; j < m; j++) {
        t = x[i * m + j];
        x[i * m + j] = x[irow[i] * m + j];
        x[irow[i] * m + j] = t;
      }
    }
    t = 1. / x[i * m + i];
    for (j = 0; j < n; j++) {
      if (j == i)
        continue;
      t1 = t * x[j * m + i];
      for (k = 0; k < n; k++)
        x[j * m + k] -= t1 * x[i * m + k];
      x[j * m + i] = -t1;
    }
    for (j = 0; j < m; j++)
      x[i * m + j] *= t;
    x[i * m + i] = t;
  }
  for (i = n - 1; i >= 0; i--) {
    if (irow[i] == i)
      continue;
    for (j = 0; j < n; j++) {
      t = x[j * m + i];
      x[j * m + i] = x[j * m + irow[i]];
      x[j * m + irow[i]] = t;
    }
  }
  return (0);
}
```