[Bug middle-end/59679] gcc version 4.7.3 and gcc version 4.5.3 cause an unaligned access exception on NetBSD/Alpha

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59679

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|tree-optimization           |middle-end

--- Comment #15 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #13)
> Confirmed as tree-optimization problem on 4.9 branch.

Actually, a middle-end problem, if at all. With -ftree-ter, expand creates a
couple of unaligned loads to arg0:

(insn 101 100 102 (set (reg:SI 150)
        (mem:SI (reg/v/f:DI 115 [ arg0 ]) [0  S4 A8])) scope-reduced.c:60 -1
     (nil))
...
(insn 105 104 106 17 (set (mem:SI (reg/v/f:DI 115 [ arg0 ]) [0  S4 A8])
        (reg:SI 151)) scope-reduced.c:60 -1
     (nil))
>From gcc-bugs-return-441787-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 28 18:26:37 2014
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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/59679] gcc version 4.7.3 and gcc version 4.5.3 cause an unaligned access exception on NetBSD/Alpha
Date: Tue, 28 Jan 2014 18:26:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59679

--- Comment #16 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #15)
> (In reply to Uroš Bizjak from comment #13)
> > Confirmed as tree-optimization problem on 4.9 branch.
> 
> Actually, a middle-end problem, if at all. With -ftree-ter, expand creates a
> couple of unaligned loads to arg0:

s/loads/moves/
>From gcc-bugs-return-441788-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 28 18:31:08 2014
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/59968] Unused BT patterns
Date: Tue, 28 Jan 2014 18:31:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY968

--- Comment #12 from H.J. Lu <hjl.tools at gmail dot com> ---
For

int bar1;
void
__attribute__((noinline))
foo1 (int y)
{
  int z;
  if (!(bar1 & (1 << y)))
    xxx1 ();
  z = bar1 & (1 << y);
  bar1 |= 1 << y;
  bar1 &= ~z;
}

we generate

    movl    bar1(%rip), %edx
    pushq    %rbx
    .cfi_def_cfa_offset 16
    .cfi_offset 3, -16
    movl    %edi, %ebx
    btl    %edi, %edx
    jc    .L3
    call    xxx1
    movl    bar1(%rip), %edx
.L3:
    movl    %ebx, %ecx
    movl    $1, %eax
    sall    %cl, %eax
    movl    %edx, %ecx
    andl    %eax, %ecx
    orl    %edx, %eax
    notl    %ecx
    andl    %ecx, %eax
    movl    %eax, bar1(%rip)
    popq    %rbx
    .cfi_def_cfa_offset 8
    ret

I expect

    btc %edi, bar2(%rip)
    jc .L7
    jmp    xxx2
.L8:
    .p2align 4,,10
    .p2align 3
.L7:
    rep ret