GCC access memory above stack top

I have C function that does some SSE calculations. When I compile it with GCC I get next code

/* Start of function */
mov    (%rdi),%rax
movslq %ecx,%rcx
...
mov    0x8(%rdi),%rax
pxor   %xmm12,%xmm3
movaps %xmm0,-0x28(%rsp)
movaps %xmm6,%xmm1
...
movaps 0x50(%rax,%rcx,1),%xmm2
movaps 0x60(%rax,%rcx,1),%xmm15
pxor   %xmm2,%xmm0
pxor   %xmm2,%xmm6
movaps -0x28(%rsp),%xmm2
pxor   %xmm15,%xmm5
pxor   %xmm15,%xmm2
movaps 0x70(%rax,%rcx,1),%xmm15
movaps (%rax,%rcx,1),%xmm11
mov    0x10(%rdi),%rax
movaps %xmm15,-0x18(%rsp)
pxor   %xmm11,%xmm4
pxor   %xmm12,%xmm11
pxor   %xmm15,%xmm12

Look at movaps instructions - it's access memory over stack top:

movaps %xmm15,-0x18(%rsp)

Isn't it an access to undefined memory? And why GCC generated such incorrect code?