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freebsd-ports/lang/gcc27/files/patch-cse.c

21 lines
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C

--- cse.c.orig Fri Aug 8 08:30:25 1997
+++ cse.c Mon Mar 20 13:29:11 2000
@@ -7567,10 +7567,15 @@
and that's just as good as a structure element
in implying that we need not invalidate scalar variables.
However, we must allow QImode aliasing of scalars, because the
- ANSI C standard allows character pointers to alias anything. */
+ ANSI C standard allows character pointers to alias anything.
+ We must also allow AND addresses, because they may generate
+ accesses outside the object being referenced. This is used to
+ generate aligned addresses from unaligned adresses, e.g., the
+ Alpha storeqi_unaligned pattern. */
if (! ((MEM_IN_STRUCT_P (written)
|| GET_CODE (XEXP (written, 0)) == PLUS)
- && GET_MODE (written) != QImode))
+ && GET_MODE (written) != QImode
+ && GET_CODE (XEXP (written, 0)) != AND))
writes_ptr->all = 1;
writes_ptr->nonscalar = 1;
}