user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<reduction>:
  endbr64
  push   %r15
  mov    %rdi,%r11
  lea    (%rsi,%rsi,1),%r9d
  mov    %esi,%r10d
  push   %r14
  push   %r13
  movslq %ecx,%r13
  movslq %edx,%rcx
  lea    (%rcx,%rcx,2),%rax
  push   %r12
  shl    $0x3,%rax
  push   %rbp
  mov    %edx,%ebp
  add    %rax,%rdi
  push   %rbx
  movss  (%rdi,%r13,4),%xmm0
  test   %r9d,%r9d
  jle    L40
  lea    -0x1(%r9),%edx
  cmp    $0x2,%edx
  jbe    L216
  movups (%rdi),%xmm1
  movaps %xmm0,%xmm2
  mov    %r9d,%r8d
  lea    0x10(%rdi),%rdx
  shufps $0x0,%xmm2,%xmm2
  shr    $0x2,%r8d
  divps  %xmm2,%xmm1
  movups %xmm1,(%rdi)
  cmp    $0x1,%r8d
  je     L20
  mov    $0x1,%esi
L146:
  movups (%rdx),%xmm1
  add    $0x1,%esi
  add    $0x10,%rdx
  divps  %xmm2,%xmm1
  movups %xmm1,-0x10(%rdx)
  cmp    %esi,%r8d
  jne    L146
L20:
  mov    %r9d,%esi
  and    $0xfffffffc,%esi
  test   $0x3,%r9b
  je     L40
L19:
  movslq %esi,%rdx
  lea    0x1(%rsi),%r8d
  lea    (%rdi,%rdx,4),%rdx
  movss  (%rdx),%xmm1
  divss  %xmm0,%xmm1
  movss  %xmm1,(%rdx)
  cmp    %r8d,%r9d
  jle    L40
  movss  0x4(%rdx),%xmm1
  add    $0x2,%esi
  divss  %xmm0,%xmm1
  movss  %xmm1,0x4(%rdx)
  cmp    %esi,%r9d
  jle    L40
  movss  0x8(%rdx),%xmm1
  divss  %xmm0,%xmm1
  movss  %xmm1,0x8(%rdx)
L40:
  test   %r10d,%r10d
  jle    L159
  lea    -0x1(%r9),%ebx
  neg    %rax
  lea    (%rcx,%rcx,2),%r15
  mov    %r9d,%r14d
  mov    %ebx,-0xc(%rsp)
  sub    %r11,%rax
  mov    %r9d,%ebx
  mov    %r11,%rdx
  shr    $0x2,%ebx
  sub    $0x4,%rax
  and    $0xfffffffc,%r14d
  add    %r15,%r15
  mov    %ebx,-0x10(%rsp)
  xor    %r8d,%r8d
  xor    %ecx,%ecx
  mov    %rax,-0x18(%rsp)
  nop
L11:
  cmp    %ecx,%ebp
  je     L127
  movss  (%rdx,%r13,4),%xmm0
  test   %r9d,%r9d
  jle    L127
  mov    -0x18(%rsp),%rax
  add    %rdx,%rax
  cmp    $0x8,%rax
  jbe    L195
  cmpl   $0x2,-0xc(%rsp)
  jbe    L12
  movups (%rdi),%xmm2
  movaps %xmm0,%xmm3
  movups (%rdx),%xmm1
  shufps $0x0,%xmm3,%xmm3
  cmpl   $0x1,-0x10(%rsp)
  mulps  %xmm3,%xmm2
  subps  %xmm2,%xmm1
  movups %xmm1,(%rdx)
  jbe    L46
  mov    $0x10,%eax
  mov    $0x1,%esi
L240:
  movups (%rdi,%rax,1),%xmm2
  movups (%rdx,%rax,1),%xmm1
  add    $0x1,%esi
  mulps  %xmm3,%xmm2
  subps  %xmm2,%xmm1
  movups %xmm1,(%rdx,%rax,1)
  add    $0x10,%rax
  cmp    %esi,-0x10(%rsp)
  jne    L240
L46:
  cmp    %r14d,%r9d
  je     L127
  mov    %r14d,%esi
  movslq %r14d,%rax
L25:
  mov    %r9d,%r12d
  sub    %esi,%r12d
  cmp    $0x1,%r12d
  je     L112
  lea    (%rsi,%r8,1),%rbx
  add    %r15,%rsi
  shufps $0xe0,%xmm0,%xmm0
  movq   (%r11,%rsi,4),%xmm2
  lea    (%r11,%rbx,4),%rbx
  movq   (%rbx),%xmm1
  mulps  %xmm2,%xmm0
  subps  %xmm0,%xmm1
  movlps %xmm1,(%rbx)
L127:
  add    $0x1,%ecx
  add    $0x18,%rdx
  add    $0x6,%r8
  cmp    %ecx,%r10d
  jne    L11
L159:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L112:
  mulss  (%rdi,%rax,4),%xmm0
  movss  (%rdx,%rax,4),%xmm1
  subss  %xmm0,%xmm1
  movss  %xmm1,(%rdx,%rax,4)
  jmp    L127
  nopw   0x0(%rax,%rax,1)
L195:
  movss  (%rdi),%xmm2
  movss  (%rdx),%xmm1
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,(%rdx)
  movss  0x4(%rdi),%xmm2
  movss  0x4(%rdx),%xmm1
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,0x4(%rdx)
  cmp    $0x1,%r10d
  je     L127
  movss  0x8(%rdi),%xmm2
  movss  0x8(%rdx),%xmm1
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,0x8(%rdx)
  movss  0xc(%rdi),%xmm2
  movss  0xc(%rdx),%xmm1
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,0xc(%rdx)
  cmp    $0x2,%r10d
  je     L127
  movss  0x10(%rdi),%xmm2
  movss  0x10(%rdx),%xmm1
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,0x10(%rdx)
  movss  0x14(%rdi),%xmm2
  movss  0x14(%rdx),%xmm1
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,0x14(%rdx)
  cmp    $0x3,%r10d
  je     L127
  movss  0x18(%rdi),%xmm2
  movss  0x18(%rdx),%xmm1
  mov    $0x7,%eax
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,0x18(%rdx)
L161:
  movss  (%rdi,%rax,4),%xmm2
  movss  (%rdx,%rax,4),%xmm1
  mulss  %xmm0,%xmm2
  subss  %xmm2,%xmm1
  movss  %xmm1,(%rdx,%rax,4)
  add    $0x1,%rax
  cmp    %eax,%r9d
  jg     L161
  jmp    L127
L12:
  xor    %esi,%esi
  xor    %eax,%eax
  jmp    L25
L216:
  xor    %esi,%esi
  jmp    L19
```

assistant: ```c
void reduction(float a[][6], int size, int pivot, int col) {
  int i, j;
  float factor;
  factor = a[pivot][col];
  for (i = 0; i < 2 * size; i++) {
    a[pivot][i] = a[pivot][i] / factor;
  }
  for (i = 0; i < size; i++) {
    if (i != pivot) {
      factor = a[i][col];
      for (j = 0; j < 2 * size; j++) {
        a[i][j] = a[i][j] - a[pivot][j] * factor;
      }
    }
  }
}
```