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explow.c (set_mem_attributes): Avoid returning a bogus alias set from a new MEM. 

* explow.c (set_mem_attributes): Avoid returning a bogus alias set
        from a new MEM.

From-SVN: r45108
This commit is contained in:
Jason Merrill 2001-08-22 10:53:20 -04:00 committed by Jason Merrill
parent 2270623af3
commit 23ac7d7e6c
2 changed files with 12 additions and 0 deletions
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gcc/ChangeLog
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@ -1,5 +1,8 @@
2001-08-22 Jason Merrill <jason_merrill@redhat.com>
* explow.c (set_mem_attributes): Avoid returning a bogus alias set
from a new MEM.
* jump.c (squeeze_notes): Take parms by reference. Handle END being
a squeezable note.
* rtl.h: Adjust.

9
gcc/explow.c
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@ -670,7 +670,16 @@ set_mem_attributes (ref, t, objectp)
here, because, in C and C++, the fact that a location is accessed
through a const expression does not mean that the value there can
never change. */
/* If we have already set DECL_RTL = ref, get_alias_set will get the
wrong answer, as it assumes that DECL_RTL already has the right alias
info. Callers should not set DECL_RTL until after the call to
set_mem_attributes. */
if (DECL_P (t) && ref == DECL_RTL_IF_SET (t))
abort ();
set_mem_alias_set (ref, get_alias_set (t));
MEM_VOLATILE_P (ref) = TYPE_VOLATILE (type);
MEM_IN_STRUCT_P (ref) = AGGREGATE_TYPE_P (type);