[Bug target/69749] New: Use aligned spill/fill for vector register in interrupt handler

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69749

            Bug ID: 69749
           Summary: Use aligned spill/fill for vector register in
                    interrupt handler
           Product: gcc
           Version: 5.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: vaalfreja at gmail dot com
  Target Milestone: ---

On hjl/interrupt/stage1 branch, I got

[hjl@gnu-6 interrupt-2]$ cat y.c
extern void bar (void);

 __attribute__((interrupt))
void
foo (void *frame)
{
  bar ();
}
[hjl@gnu-6 interrupt-2]$ make y.s
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -S -O2 y.c
[hjl@gnu-6 interrupt-2]$ cat y.s
        .file   "y.c"
        .text
        .p2align 4,,15
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        pushq   %rbp
        .cfi_def_cfa_offset 16
        .cfi_offset 6, -16
        movq    %rsp, %rbp
        .cfi_def_cfa_register 6
        pushq   %r11
        pushq   %r10
        pushq   %r9
        pushq   %r8
        pushq   %rdi
        pushq   %rsi
        pushq   %rcx
        pushq   %rdx
        pushq   %rax
        andq    $-16, %rsp
        subq    $256, %rsp
        movups  %xmm0, -328(%rbp)
        .cfi_escape 0x10,0x11,0x3,0x76,0xb8,0x7d
        .cfi_offset 11, -24
        .cfi_offset 10, -32
        .cfi_offset 9, -40
        .cfi_offset 8, -48
        .cfi_offset 5, -56
        .cfi_offset 4, -64
        .cfi_offset 2, -72
        .cfi_offset 1, -80
        .cfi_offset 0, -88
        movups  %xmm1, -312(%rbp)
        .cfi_escape 0x10,0x12,0x3,0x76,0xc8,0x7d
        movups  %xmm2, -296(%rbp)
        .cfi_escape 0x10,0x13,0x3,0x76,0xd8,0x7d
        movups  %xmm3, -280(%rbp)
        .cfi_escape 0x10,0x14,0x3,0x76,0xe8,0x7d
        movups  %xmm4, -264(%rbp)
        .cfi_escape 0x10,0x15,0x3,0x76,0xf8,0x7d
        movups  %xmm5, -248(%rbp)
        .cfi_escape 0x10,0x16,0x3,0x76,0x88,0x7e
        movups  %xmm6, -232(%rbp)
        .cfi_escape 0x10,0x17,0x3,0x76,0x98,0x7e
        movups  %xmm7, -216(%rbp)
        .cfi_escape 0x10,0x18,0x3,0x76,0xa8,0x7e
        movups  %xmm8, -200(%rbp)
        .cfi_escape 0x10,0x19,0x3,0x76,0xb8,0x7e
        movups  %xmm9, -184(%rbp)
        .cfi_escape 0x10,0x1a,0x3,0x76,0xc8,0x7e
        movups  %xmm10, -168(%rbp)
        .cfi_escape 0x10,0x1b,0x3,0x76,0xd8,0x7e
        movups  %xmm11, -152(%rbp)
        .cfi_escape 0x10,0x1c,0x3,0x76,0xe8,0x7e
        movups  %xmm12, -136(%rbp)
        .cfi_escape 0x10,0x1d,0x3,0x76,0xf8,0x7e
        movups  %xmm13, -120(%rbp)
        .cfi_escape 0x10,0x1e,0x3,0x76,0x88,0x7f
        movups  %xmm14, -104(%rbp)
        .cfi_escape 0x10,0x1f,0x3,0x76,0x98,0x7f
        movups  %xmm15, -88(%rbp)
        .cfi_escape 0x10,0x20,0x3,0x76,0xa8,0x7f
        cld
        call    bar
        movups  -328(%rbp), %xmm0
        movups  -312(%rbp), %xmm1
        movups  -296(%rbp), %xmm2
        movups  -280(%rbp), %xmm3
        movups  -264(%rbp), %xmm4
        movups  -248(%rbp), %xmm5
        movups  -232(%rbp), %xmm6
        movups  -216(%rbp), %xmm7
        movups  -200(%rbp), %xmm8
        movups  -184(%rbp), %xmm9
        movups  -168(%rbp), %xmm10
        movups  -152(%rbp), %xmm11
        movups  -136(%rbp), %xmm12
        movups  -120(%rbp), %xmm13
        movups  -104(%rbp), %xmm14
        movups  -88(%rbp), %xmm15
        leaq    -72(%rbp), %rsp
        .cfi_restore 29
        .cfi_restore 28
        .cfi_restore 27
        .cfi_restore 26
        .cfi_restore 25
        .cfi_restore 24
        .cfi_restore 23
        .cfi_restore 22
        .cfi_restore 21
        .cfi_restore 20
        .cfi_restore 19
        .cfi_restore 18
        .cfi_restore 17
        popq    %rax
        popq    %rdx
        popq    %rcx
        popq    %rsi
        popq    %rdi
        popq    %r8
        popq    %r9
        popq    %r10
        popq    %r11
        popq    %rbp
        .cfi_def_cfa 7, 8
        iretq
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .ident  "GCC: (GNU) 6.0.0 20160209 (experimental)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-6 interrupt-2]$ 

We should use aligned spill/fill for vector registers.