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re PR debug/53671 (Many guality test failures) 

PR debug/53671
PR debug/49888
* alias.c (memrefs_conflict_p): Improve handling of AND for
alignment.

From-SVN: r188868
This commit is contained in:
Alexandre Oliva 2012-06-22 01:30:16 +00:00 committed by Alexandre Oliva
parent 1ca63357cb
commit a9bf4fe2dd
2 changed files with 28 additions and 14 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2012-06-21 Alexandre Oliva <aoliva@redhat.com>
PR debug/53671
PR debug/49888
* alias.c (memrefs_conflict_p): Improve handling of AND for
alignment.
2012-06-21 Alexandre Oliva <aoliva@redhat.com>
* ddg.c (build_intra_loop_deps): Discard deps of nondebug on debug.

35
gcc/alias.c
View File

@ -2097,25 +2097,32 @@ memrefs_conflict_p (int xsize, rtx x, int ysize, rtx y, HOST_WIDE_INT c)
break;
}
/* Treat an access through an AND (e.g. a subword access on an Alpha)
as an access with indeterminate size. Assume that references
besides AND are aligned, so if the size of the other reference is
at least as large as the alignment, assume no other overlap. */
/* Deal with alignment ANDs by adjusting offset and size so as to
cover the maximum range, without taking any previously known
alignment into account. */
if (GET_CODE (x) == AND && CONST_INT_P (XEXP (x, 1)))
{
if (GET_CODE (y) == AND || ysize < -INTVAL (XEXP (x, 1)))
xsize = -1;
return memrefs_conflict_p (xsize, canon_rtx (XEXP (x, 0)), ysize, y, c);
HOST_WIDE_INT sc = INTVAL (XEXP (x, 1));
unsigned HOST_WIDE_INT uc = sc;
if (xsize > 0 && sc < 0 && -uc == (uc & -uc))
{
xsize -= sc + 1;
c -= sc;
return memrefs_conflict_p (xsize, canon_rtx (XEXP (x, 0)),
ysize, y, c);
}
}
if (GET_CODE (y) == AND && CONST_INT_P (XEXP (y, 1)))
{
/* ??? If we are indexing far enough into the array/structure, we
may yet be able to determine that we can not overlap. But we
also need to that we are far enough from the end not to overlap
a following reference, so we do nothing with that for now. */
if (GET_CODE (x) == AND || xsize < -INTVAL (XEXP (y, 1)))
ysize = -1;
return memrefs_conflict_p (xsize, x, ysize, canon_rtx (XEXP (y, 0)), c);
HOST_WIDE_INT sc = INTVAL (XEXP (y, 1));
unsigned HOST_WIDE_INT uc = sc;
if (ysize > 0 && sc < 0 && -uc == (uc & -uc))
{
ysize -= sc + 1;
c += sc;
return memrefs_conflict_p (xsize, x,
ysize, canon_rtx (XEXP (y, 0)), c);
}
}
if (CONSTANT_P (x))