user: What is the c source code of the assembly code below?

```asm
<pencil_strmv_n_nun>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  sub    $0x60,%rsp
  mov    %edi,-0x54(%rbp)
  mov    %esi,-0x58(%rbp)
  mov    %rdx,-0x60(%rbp)
  mov    %ecx,-0x64(%rbp)
  mov    %r8,-0x70(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x28(%rbp)
  xor    %eax,%eax
  mov    -0x54(%rbp),%esi
  movslq %esi,%rax
  sub    $0x1,%rax
  mov    %rax,-0x48(%rbp)
  movslq %esi,%rax
  mov    %rax,-0x80(%rbp)
  movq   $0x0,-0x78(%rbp)
  mov    -0x64(%rbp),%ecx
  movslq %ecx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x40(%rbp)
  movslq %ecx,%rax
  mov    %rax,%r14
  mov    $0x0,%r15d
  movl   $0x0,-0x50(%rbp)
  jmp    L58
L42:
  mov    %rsp,%rax
  mov    %rax,%r8
  mov    -0x54(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x38(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r10
  mov    $0x0,%r11d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rdi
  and    $0xfffffffffffff000,%rdi
  mov    %rsp,%rdx
  sub    %rdi,%rdx
L45:
  cmp    %rdx,%rsp
  je     L39
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L45
L39:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L51
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L51:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x30(%rbp),%rax
  mov    -0x50(%rbp),%edx
  movslq %edx,%rdx
  pxor   %xmm0,%xmm0
  movss  %xmm0,(%rax,%rdx,4)
  movl   $0x0,-0x4c(%rbp)
  jmp    L27
L22:
  mov    -0x30(%rbp),%rax
  mov    -0x50(%rbp),%edx
  movslq %edx,%rdx
  movss  (%rax,%rdx,4),%xmm1
  mov    -0x50(%rbp),%eax
  movslq %eax,%rdx
  movslq %esi,%rax
  imul   %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x60(%rbp),%rax
  add    %rax,%rdx
  mov    -0x50(%rbp),%edi
  mov    -0x4c(%rbp),%eax
  add    %edi,%eax
  cltq
  movss  (%rdx,%rax,4),%xmm2
  mov    -0x50(%rbp),%edx
  mov    -0x4c(%rbp),%eax
  add    %edx,%eax
  movslq %eax,%rdx
  movslq %ecx,%rax
  imul   %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  %xmm2,%xmm0
  addss  %xmm1,%xmm0
  mov    -0x30(%rbp),%rax
  mov    -0x50(%rbp),%edx
  movslq %edx,%rdx
  movss  %xmm0,(%rax,%rdx,4)
  addl   $0x1,-0x4c(%rbp)
L27:
  mov    -0x54(%rbp),%eax
  sub    $0x1,%eax
  sub    -0x50(%rbp),%eax
  cmp    %eax,-0x4c(%rbp)
  jle    L22
  mov    -0x50(%rbp),%eax
  movslq %eax,%rdx
  movslq %ecx,%rax
  imul   %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x70(%rbp),%rax
  lea    (%rdx,%rax,1),%rdi
  mov    -0x30(%rbp),%rax
  mov    -0x50(%rbp),%edx
  movslq %edx,%rdx
  movss  (%rax,%rdx,4),%xmm0
  movss  %xmm0,(%rdi)
  mov    %r8,%rsp
  addl   $0x1,-0x50(%rbp)
L58:
  mov    -0x54(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jg     L42
  nop
  mov    -0x28(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L3
  call   <__stack_chk_fail@plt>
L3:
  lea    -0x20(%rbp),%rsp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void pencil_strmv_n_nun(int n_7988_8196, int ldAT_7989_8197, float AT_7990_8198[restrict const n_7988_8196][n_7988_8196], int incX_7991_8199, float X_7992_8200[restrict const n_7988_8196][incX_7991_8199]) {
#pragma scop
  {
    for (int i_1992_4008_7662_10587 = 0; i_1992_4008_7662_10587 <= (n_7988_8196 - 1); i_1992_4008_7662_10587 += 1) {
      float accum_1994_4010_7663_10586[n_7988_8196];
      accum_1994_4010_7663_10586[i_1992_4008_7662_10587] = 0.0f;
      for (int i_1995_4011_7664_10588 = 0; i_1995_4011_7664_10588 <= ((((n_7988_8196 - 1) - i_1992_4008_7662_10587) + 1) - 1); i_1995_4011_7664_10588 += 1) {
        accum_1994_4010_7663_10586[i_1992_4008_7662_10587] = (accum_1994_4010_7663_10586[i_1992_4008_7662_10587] + (AT_7990_8198[i_1992_4008_7662_10587][(i_1992_4008_7662_10587 + i_1995_4011_7664_10588)] * X_7992_8200[(i_1992_4008_7662_10587 + i_1995_4011_7664_10588)][0]));
      }
      X_7992_8200[i_1992_4008_7662_10587][0] = accum_1994_4010_7663_10586[i_1992_4008_7662_10587];
    }
  }
#pragma endscop
}
```