[Bug rtl-optimization/23561] nonoverlapping_memrefs_p returns true even for overlapping memory references

["cvs-commit at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-08-26 22:02 -------
Subject: Bug 23561

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	jakub@gcc.gnu.org	2005-08-26 22:02:45

Modified files:
	gcc            : ChangeLog builtins.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/gcc.c-torture/execute: 20050826-1.c 

Log message:
	PR rtl-optimization/23561
	* builtins.c (get_memory_rtx): Add LEN argument.  If MEM_EXPR is
	a COMPONENT_REF, remove all COMPONENT_REF from MEM_EXPR unless
	at most LEN bytes long memory fits into the field.
	(expand_builtin_memcpy, expand_builtin_mempcpy, expand_movstr,
	expand_builtin_strncpy, expand_builtin_memset, expand_builtin_memcmp,
	expand_builtin_strcmp, expand_builtin_strncmp): Adjust callers.
	
	* gcc.c-torture/execute/20050826-1.c: New test.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.9833&r2=2.9834
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/builtins.c.diff?cvsroot=gcc&r1=1.472&r2=1.473
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.5968&r2=1.5969
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20050826-1.c.diff?cvsroot=gcc&r1=NONE&r2=1.1



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23561