Re: target/6137: ia64 -O3 generates bad overlapping memory accesses

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* Re: target/6137: ia64 -O3 generates bad overlapping memory accesses
@ 2002-04-12 17:37 rth
  0 siblings, 0 replies; 3+ messages in thread
From: rth @ 2002-04-12 17:37 UTC (permalink / raw)
  To: gcc-bugs, gcc-prs, janis187, nobody

Synopsis: ia64 -O3 generates bad overlapping memory accesses

State-Changed-From-To: open->analyzed
State-Changed-By: rth
State-Changed-When: Fri Apr 12 17:37:44 2002
State-Changed-Why:
    It's another damned RTX_UNCHANGING_P bug.
    
    (insn 85 84 88 (set (reg/v/f:DI 361)
            (plus:DI (reg/f:DI 328 sfp)
                (const_int 48 [0x30]))) 90 {adddi3} (nil)
        (nil))
    (insn 98 97 99 (set (mem/s:DI (reg/v/f:DI 361) [0 S8 A64])
            (reg:DI 365)) 6 {*movdi_internal} (nil)
        (nil))
    (insn 133 131 134 (set (reg:DI 375)
            (mem/s/u:DI (reg/v/f:DI 361) [0 S8 A128])) 6 {*movdi_internal} (nil)
        (nil))
    
    The load doesn't conflict with the store.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6137


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: target/6137: ia64 -O3 generates bad overlapping memory accesses
@ 2002-10-10  9:41 janis
  0 siblings, 0 replies; 3+ messages in thread
From: janis @ 2002-10-10  9:41 UTC (permalink / raw)
  To: gcc-bugs, gcc-prs, janis187, nobody

Synopsis: ia64 -O3 generates bad overlapping memory accesses

State-Changed-From-To: analyzed->closed
State-Changed-By: janis
State-Changed-When: Thu Oct 10 09:41:14 2002
State-Changed-Why:
    The test case passes with the mainline and 3.2 branch as of
    20021008.  I don't know what fixed it.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6137


^ permalink raw reply	[flat|nested] 3+ messages in thread

* target/6137: ia64 -O3 generates bad overlapping memory accesses
@ 2002-04-02 10:46 janis187
  0 siblings, 0 replies; 3+ messages in thread
From: janis187 @ 2002-04-02 10:46 UTC (permalink / raw)
  To: gcc-gnats


>Number:         6137
>Category:       target
>Synopsis:       ia64 -O3 generates bad overlapping memory accesses
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 02 10:46:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Janis Johnson
>Release:        gcc version 3.1 20020402 (prerelease)
>Organization:
>Environment:
Itanium; Red Hat Linux release 7.2 (Enigma
>Description:
The code generated for this test case with -O3 on ia64
interleaves two memory copies, causing some of the values
on the stack to be loaded before they are first stored to.
This happens in the following function, for which copies
of 4 8-byte values from r12+64 to r12+16 are interleaved
with copies from the second argument to r12+64:

  void test_T2a(Tensor1<double,2> &t1_1,
                Tensor2<double,2,2> &t2_1)
  {
    Index<'i',2> i;

    t1_1(i)=t2_1(i,0);
    dump2(t1_1,t2_1);
  }

This happens with GCC 3.0.4 as well.

The test case is taken from the FTensor package, which is
covered by the GPL.
>How-To-Repeat:
Compile the attached test case with
"-w -ftemplate-depth-100 -Drestrict= -DFTENSOR_DEBUG -O3".
When run, it should print "10 10".  Examine the generated
code for function test_T2a.
>Fix:
Unknown.
>Release-Note:
>Audit-Trail:
>Unformatted:
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Cg==


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2002-10-10 16:41 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2002-04-12 17:37 target/6137: ia64 -O3 generates bad overlapping memory accesses rth
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2002-10-10  9:41 janis
2002-04-02 10:46 janis187

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