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expr.c (store_field): Don't set MEM_ALIAS_SET for a field in a structure at a variable address.

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* expr.c (store_field): Don't set MEM_ALIAS_SET for a field
	in a structure at a variable address.

From-SVN: r43256
This commit is contained in:
Mark Mitchell 2001-06-12 11:17:09 +00:00 committed by Mark Mitchell
parent c50174e729
commit 0ea834c115
2 changed files with 15 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-06-12 Mark Mitchell <mark@codesourcery.com>
* expr.c (store_field): Don't set MEM_ALIAS_SET for a field
in a structure at a variable address.
2001-06-12 Joseph S. Myers <jsm28@cam.ac.uk>
* doc/gcov.texi: Use more logical markup.

11
gcc/expr.c
View File

@ -5327,7 +5327,16 @@ store_field (target, bitsize, bitpos, mode, exp, value_mode,
(bitpos
/ BITS_PER_UNIT))));
MEM_SET_IN_STRUCT_P (to_rtx, 1);
MEM_ALIAS_SET (to_rtx) = alias_set;
/* If the address of the structure varies, then it might be on
the stack. And, stack slots may be shared across scopes.
So, two different structures, of different types, can end up
at the same location. We will give the structures alias set
zero; here we must be careful not to give non-zero alias sets
to their fields. */
if (!rtx_varies_p (addr, /*for_alias=*/0))
MEM_ALIAS_SET (to_rtx) = alias_set;
else
MEM_ALIAS_SET (to_rtx) = 0;
return store_expr (exp, to_rtx, value_mode != VOIDmode);
}