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Fix for sparc va_arg macro aliasing problem. 

* c-common.c (c_get_alias_set): Handle ARRAY_REF of union field.

From-SVN: r23427
This commit is contained in:
Jim Wilson 1998-10-29 12:40:21 +00:00 committed by Jim Wilson
parent 7140b0dba6
commit 1e2800358a
2 changed files with 13 additions and 2 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Thu Oct 29 12:39:35 1998 Jim Wilson <wilson@cygnus.com>
* c-common.c (c_get_alias_set): Handle ARRAY_REF of union field.
Thu Oct 29 14:10:22 EST 1998 Andrew MacLeod <amacleod@cygnus.com>
* except.c (emit_eh_context): Make the EH context register stay alive

11
gcc/c-common.c
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@ -3155,8 +3155,15 @@ c_get_alias_set (t)
the conservative assumption. */
return 0;
if (TREE_CODE (t) == COMPONENT_REF
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == UNION_TYPE)
if ((TREE_CODE (t) == COMPONENT_REF
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == UNION_TYPE)
/* Also permit punning when accessing an array which is a union
member. This makes the current sparc va_arg macro work, but may
not be otherwise necessary. */
|| (TREE_CODE (t) == ARRAY_REF
&& TREE_CODE (TREE_OPERAND (t, 0)) == COMPONENT_REF
&& (TREE_CODE (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)))
== UNION_TYPE)))
/* Permit type-punning when accessing a union, provided the
access is directly through the union. For example, this code does
not permit taking the address of a union member and then