[3.2/3.3/3.4 regression] alias problem during loop pass on m68k
>Category: other
>Synopsis: [3.2/3.3/3.4 regression] alias problem during loop pass on m68k
>Confidential: no
>Severity: serious
>Priority: medium
>Class: wrong-code
>Submitter-Id: net
>Originator: zippel@linux-m68k.org
>Release: 3.2/3.3/3.4
>Environment:
linux-m68k
>Description:
The message repeated here was originall sent to:
http://gcc.gnu.org/ml/gcc/2003-03/msg00574.html
Hi,
I'm currently trying to debug a problem, which causes a few problems for
Debian/m68k. The problem is present at least since 3.2 and also in
latest tree, but it seems not to be in 3.0.
I've put a test case at http://www.xs4all.nl/~zippel/sha.i, it's a
precompiled example from coreutils. Here is the important part:
void
sha_process_block (const void *buffer, size_t len, struct sha_ctx *ctx)
{
const md5_uint32 *words = buffer;
size_t nwords = len / sizeof (md5_uint32);
const md5_uint32 *endp = words + nwords;
md5_uint32 x[16];
[..]
while (words < endp)
{
md5_uint32 tm;
int t;
for (t = 0; t < 16; t++)
{
x[t] = (*words);
words++;
}
First it looks at the small loop and replaces x[t] with a pointer:
-(insn 86 84 87 (set (mem/s:SI (plus:SI (plus:SI (mult:SI (reg/v:SI 47)
- (const_int 4 [0x4]))
- (reg/f:SI 14 %a6))
- (const_int -64 [0xffffffc0])) [5 x S4 A16])
- (mem:SI (reg/v/f:SI 32) [5 S4 A16])) 29 {*m68k.md:976} (nil)
+(insn 86 84 2470 (set (mem/s:SI (reg/f:SI 1137) [5 x S4 A16])
+ (mem:SI (reg/v/f:SI 32) [5 S4 A16])) -1 (nil)
+ (nil))
+
+(insn 2470 86 87 (set (reg/f:SI 1137)
+ (plus:SI (reg/f:SI 1137)
+ (const_int 4 [0x4]))) -1 (nil)
(nil))
The problem is now when it looks at the large loop, the x array is only
read after this and the optimizer thinks now it can move the array out
of the loop. AFAICS it goes wrong in loop.c:load_mems(), it does an
alias analysis with the already modified instructions, but then it uses
loop_info->store_mems to test for dependency tests, but this list still
contains the old reference.
At this point I really could need some help, how this should be fixed
correctly. Any ideas?
>How-To-Repeat:
>Fix:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="sha.i"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="sha.i"
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