user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<fir_downsampling_kernel>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %rcx,%rbp
  push   %rbx
  mov    0x40(%rsp),%rax
  mov    %rdi,%rbx
  lea    -0x1(%rcx),%rdi
  cmp    %rbx,%rdi
  mov    0x38(%rsp),%r12
  mov    (%rax),%r10
  lea    -0x1(%rbx),%rax
  cmovl  %rdi,%rax
  mov    %rdx,-0x18(%rsp)
  mov    %rdi,-0x20(%rsp)
  mov    %rax,-0x28(%rsp)
  cmp    %r10,%rax
  jl     L331
  lea    -0x4(%rsi),%rax
  mov    %rbx,-0x10(%rsp)
  mov    %rdx,%rcx
  lea    (%r8,%rbp,4),%rdi
  xor    %r11d,%r11d
  lea    -0x8(,%rbp,4),%r14
  lea    0x4(%r8),%r13
  mov    %rax,%rbx
  nopw   0x0(%rax,%rax,1)
L306:
  movss  (%rsi,%r10,4),%xmm0
  mulss  (%r8),%xmm0
  movss  %xmm0,(%rcx)
  test   %r10,%r10
  jle    L231
  lea    (%rbx,%r10,4),%rax
  lea    0x4(%r8),%rdx
  nopl   0x0(%rax)
L188:
  movss  (%rax),%xmm1
  mulss  (%rdx),%xmm1
  mov    %rax,%r15
  add    $0x4,%rdx
  sub    $0x4,%rax
  addss  %xmm1,%xmm0
  movss  %xmm0,(%rcx)
  cmp    %rsi,%r15
  jne    L188
L231:
  lea    0x1(%r10),%r15
  lea    (%r9,%r14,1),%rdx
  lea    0x0(%r13,%r10,4),%rax
  cmp    %r15,%rbp
  jle    L24
  nopw   0x0(%rax,%rax,1)
L279:
  movss  (%rdx),%xmm1
  mulss  (%rax),%xmm1
  add    $0x4,%rax
  sub    $0x4,%rdx
  addss  %xmm1,%xmm0
  movss  %xmm0,(%rcx)
  cmp    %rdi,%rax
  jne    L279
L24:
  add    $0x1,%r11
  lea    (%r12,%r10,1),%rax
  add    $0x4,%rcx
  cmp    %rax,-0x28(%rsp)
  jl     L150
  mov    %rax,%r10
  jmp    L306
L150:
  mov    -0x10(%rsp),%rbx
L123:
  mov    0x40(%rsp),%rdi
  mov    %r10,(%rdi)
  cmp    %rax,%rbx
  jle    L172
  mov    %rdi,%r15
  mov    -0x18(%rsp),%rdi
  lea    0x0(,%r12,4),%r14
  lea    (%r8,%rbp,4),%r10
  lea    -0x4(%rsi,%rax,4),%r13
  lea    (%rdi,%r11,4),%rdi
  nop
L375:
  movss  0x4(%r13),%xmm1
  mulss  (%r8),%xmm1
  lea    0x4(%r8),%rdx
  mov    %r13,%rcx
  movss  %xmm1,(%rdi)
  cmp    $0x1,%rbp
  jle    L345
  nopl   0x0(%rax)
L374:
  movss  (%rcx),%xmm0
  mulss  (%rdx),%xmm0
  add    $0x4,%rdx
  sub    $0x4,%rcx
  addss  %xmm0,%xmm1
  movss  %xmm1,(%rdi)
  cmp    %r10,%rdx
  jne    L374
L345:
  mov    %rax,(%r15)
  add    %r12,%rax
  add    $0x1,%r11
  add    $0x4,%rdi
  add    %r14,%r13
  cmp    %rax,%rbx
  jg     L375
L172:
  mov    0x40(%rsp),%rdi
  sub    %rbx,%rax
  mov    %rax,(%rdi)
  cmp    %rbx,-0x20(%rsp)
  jle    L148
  lea    -0x2(%rbp),%r8
  mov    %r8,%rdi
  sub    %rbx,%rdi
  js     L69
  lea    0x4(,%rbx,4),%rax
  mov    %rax,%rdx
  neg    %rdx
  cmp    $0x8,%rdx
  jbe    L2
  cmp    $0x2,%rdi
  jbe    L2
  lea    0x1(%rdi),%r10
  lea    -0x4(%r9,%rax,1),%rcx
  xor    %eax,%eax
  mov    %r10,%rdx
  shr    $0x2,%rdx
  shl    $0x4,%rdx
  nopl   0x0(%rax)
L283:
  movups (%rcx,%rax,1),%xmm3
  movups %xmm3,(%r9,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L283
  mov    %r10,%rax
  and    $0xfffffffffffffffc,%rax
  and    $0x3,%r10d
  je     L69
  lea    (%rax,%rbx,1),%rdx
  movss  (%r9,%rdx,4),%xmm0
  lea    0x1(%rax),%rdx
  movss  %xmm0,(%r9,%rax,4)
  cmp    %rdx,%rdi
  jl     L69
  lea    (%rbx,%rdx,1),%rcx
  add    $0x2,%rax
  lea    0x0(,%rdx,4),%r10
  movss  (%r9,%rcx,4),%xmm0
  movss  %xmm0,(%r9,%rdx,4)
  cmp    %rax,%rdi
  jl     L69
  add    %rbx,%rax
  movss  (%r9,%rax,4),%xmm0
  movss  %xmm0,0x4(%r9,%r10,1)
L69:
  mov    -0x20(%rsp),%rax
  mov    %rax,%rdx
  sub    %rbx,%rdx
  cmp    %rdx,%rax
  jle    L260
  mov    %rbp,%rax
  lea    0x4(%rsi),%rcx
  lea    -0x1(%rbx),%r12
  mov    %rbp,%r10
  sub    %rbx,%rax
  sub    %rdx,%r10
  lea    -0x4(%r9,%rax,4),%rdi
  mov    %rdi,%rax
  sub    %rcx,%rax
  cmp    $0x8,%rax
  jbe    L329
  lea    -0x2(%r10),%rax
  cmp    $0x2,%rax
  jbe    L329
  sub    $0x1,%r10
  xor    %eax,%eax
  mov    %r10,%rcx
  shr    $0x2,%rcx
  shl    $0x4,%rcx
  nopl   (%rax)
L383:
  movups (%rsi,%rax,1),%xmm4
  movups %xmm4,(%rdi,%rax,1)
  add    $0x10,%rax
  cmp    %rcx,%rax
  jne    L383
  mov    %r10,%rax
  and    $0xfffffffffffffffc,%rax
  add    %rax,%rdx
  cmp    %r10,%rax
  je     L260
  lea    (%rdx,%r12,1),%rax
  mov    -0x20(%rsp),%rbx
  sub    %r8,%rax
  movss  (%rsi,%rax,4),%xmm0
  lea    0x1(%rdx),%rax
  movss  %xmm0,(%r9,%rdx,4)
  cmp    %rax,%rbx
  jle    L260
  lea    (%r12,%rax,1),%rcx
  add    $0x2,%rdx
  lea    0x0(,%rax,4),%rdi
  sub    %r8,%rcx
  movss  (%rsi,%rcx,4),%xmm0
  movss  %xmm0,(%r9,%rax,4)
  cmp    %rdx,%rbx
  jle    L260
  add    %rdx,%r12
  sub    %r8,%r12
  movss  (%rsi,%r12,4),%xmm0
  movss  %xmm0,0x4(%r9,%rdi,1)
L260:
  pop    %rbx
  mov    %r11,%rax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L148:
  mov    -0x20(%rsp),%r14
  test   %r14,%r14
  jle    L260
  lea    0x1(%rbx),%rdi
  sub    %rbp,%rbx
  mov    %r9,%rdx
  lea    0x8(,%rbx,4),%rax
  sub    %rbp,%rdi
  lea    (%rsi,%rax,1),%rcx
  sub    %rcx,%rdx
  cmp    $0x8,%rdx
  jbe    L211
  sub    $0x2,%rbp
  cmp    $0x2,%rbp
  jbe    L211
  mov    %r14,%rdx
  lea    -0x4(%rsi,%rax,1),%rcx
  xor    %eax,%eax
  shr    $0x2,%rdx
  shl    $0x4,%rdx
  nopl   0x0(%rax)
L243:
  movups (%rcx,%rax,1),%xmm2
  movups %xmm2,(%r9,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rdx
  jne    L243
  mov    -0x20(%rsp),%rbx
  mov    %rbx,%rax
  and    $0xfffffffffffffffc,%rax
  test   $0x3,%bl
  je     L260
  lea    (%rax,%rdi,1),%rdx
  movss  (%rsi,%rdx,4),%xmm0
  lea    0x1(%rax),%rdx
  movss  %xmm0,(%r9,%rax,4)
  cmp    %rdx,%rbx
  jle    L260
  lea    (%rdx,%rdi,1),%rcx
  add    $0x2,%rax
  lea    0x0(,%rdx,4),%r8
  movss  (%rsi,%rcx,4),%xmm0
  movss  %xmm0,(%r9,%rdx,4)
  cmp    %rax,%rbx
  jle    L260
  add    %rdi,%rax
  movss  (%rsi,%rax,4),%xmm0
  mov    %r11,%rax
  movss  %xmm0,0x4(%r9,%r8,1)
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L331:
  lea    (%r10,%r12,1),%rax
  xor    %r11d,%r11d
  jmp    L123
L2:
  mov    %r9,%rax
  lea    0x4(%r9,%rdi,4),%rdx
L207:
  movss  (%rax,%rbx,4),%xmm0
  add    $0x4,%rax
  movss  %xmm0,-0x4(%rax)
  cmp    %rax,%rdx
  jne    L207
  jmp    L69
L329:
  sub    %rbp,%rbx
  mov    -0x20(%rsp),%rcx
  lea    (%rsi,%rbx,4),%rax
  nopl   0x0(%rax)
L15:
  movss  0x4(%rax,%rdx,4),%xmm0
  movss  %xmm0,(%r9,%rdx,4)
  add    $0x1,%rdx
  cmp    %rdx,%rcx
  jne    L15
  jmp    L260
L211:
  mov    -0x20(%rsp),%rcx
  lea    (%rsi,%rdi,4),%rdx
  xor    %eax,%eax
  nopl   (%rax)
L275:
  movss  (%rdx,%rax,4),%xmm0
  movss  %xmm0,(%r9,%rax,4)
  add    $0x1,%rax
  cmp    %rax,%rcx
  jne    L275
  jmp    L260
```

assistant: ```c
long fir_downsampling_kernel(lenx, x, y, lenh0, h0, T, downfac, k0)
long lenx;
float *x;
float *y;
long lenh0;
float *h0;
float *T;
long downfac;
long *k0;
{
  long ktrans, kx, kStart, ky, kappa;
  kStart = *k0;
  ky = 0;
  ktrans = lenh0 - 1;
  if (ktrans > lenx - 1)
    ktrans = lenx - 1;
  for (kx = *k0; kx <= ktrans; kx += downfac) {
    y[ky] = x[kx] * h0[0];
    for (kappa = 1; kappa <= kx; kappa++) {
      y[ky] += x[kx - kappa] * h0[kappa];
    }
    for (kappa = kx + 1; kappa < lenh0; kappa++) {
      y[ky] += T[lenh0 - 2 + kx + 1 - kappa] * h0[kappa];
    }
    ky++;
    kStart = kx;
  }
  *k0 = kStart;
  for (kx = kStart + downfac; kx <= lenx - 1; kx += downfac) {
    y[ky] = x[kx] * h0[0];
    for (kappa = 1; kappa <= lenh0 - 1; kappa++) {
      y[ky] += x[kx - kappa] * h0[kappa];
    }
    ky++;
    *k0 = kx;
  }
  *k0 = *k0 + downfac;
  *k0 = *k0 - lenx;
  if (lenx >= lenh0 - 1) {
    for (kappa = 0; kappa <= lenh0 - 2; kappa++) {
      T[kappa] = x[lenx + 1 - lenh0 + kappa];
    }
  } else {
    for (kappa = 0; kappa <= lenh0 - 2 - lenx; kappa++) {
      T[kappa] = T[kappa + lenx];
    }
    for (kappa = lenh0 - 1 - lenx; kappa <= lenh0 - 2; kappa++) {
      T[kappa] = x[lenx - 1 + kappa - (lenh0 - 2)];
    }
  }
  return ky;
}
```