[Bug optimization/13424] [3.4 Regression] gcc.dg/20031202-1.c is miscompiled

["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  2004-02-10 18:08 -------
Subject: Bug 13424

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_4-branch
Changes by:	jakub@gcc.gnu.org	2004-02-10 18:07:58

Modified files:
	gcc            : ChangeLog expr.c emit-rtl.c 
	gcc/config/i386: i386.c i386.md i386-protos.h 

Log message:
	PR optimization/13424
	Backport from mainline:
	
	2004-01-29  Jakub Jelinek  <jakub@redhat.com>
	* emit-rtl.c (change_address): Use XEXP (memref, 0) instead
	of addr when creating MEM copy.
	
	2004-01-28  Jakub Jelinek  <jakub@redhat.com>
	* expr.c (store_constructor): Revert 2003-12-03 change.
	
	* emit-rtl.c (change_address): Check also if MEM_ATTRS is set as
	expected before returning early.  Avoid sharing RTL if they
	need to be changed.
	
	* config/i386/i386.c (ix86_expand_movstr): Rework rep_mov and strmov
	handling so that memory attributes are preserved.  Don't call
	ix86_set_move_mem_attrs.
	(ix86_set_move_mem_attrs_1, ix86_set_move_mem_attrs): Removed.
	(ix86_expand_clrstr): Rename src argument to
	dst.  Rework rep_stos and strset handling so that memory attributes
	are preserved.
	(ix86_expand_strlen): Pass src argument to
	ix86_expand_strlensi_unroll_1.  Rework strlenqi_1 handling so that
	memory attributes are preserved.
	(ix86_expand_strlensi_unroll_1): Add src argument.  Use
	change_address instead of gen_rtx_MEM.
	* config/i386/i386.md (strmov, strmov_singleop, rep_mov): New
	expanders.
	(strmovdi_rex64, strmovsi, strmovsi_rex64, strmovhi, strmovhi_rex64,
	strmovqi, strmovqi_rex64): Remove.
	(rep_mov*, strmov*): Prefix insn names with *.
	(strset, strset_singleop, rep_stos): New expanders.
	(strsetdi_rex64, strsetsi, strsetsi_rex64, strsethi, strsethi_rex64,
	strsetqi, strsetqi_rex64): Remove.
	(rep_stos*, strset*): Prefix insn names with *.
	(rep_stosqi_rex64): Likewise.  Fix mode of dirflag reg from DImode
	to SImode.
	(cmpstrsi): Rework cmpstrqi_1 handling so that memory attributes
	are preserved.
	(cmpstrqi_nz_1, cmpstrqi_nz_rex_1, cmpstrqi_1, cmpstrqi_rex_1):
	Prefix insn names with *.
	(cmpstrqi_nz_1, cmpstrqi_1): New expanders.
	(strlenqi_1, strlenqi_rex_1): Prefix insn names with *.
	(strlenqi_1): New expander.
	* config/i386/i386.h (ix86_set_move_mem_attrs): Remove prototype.
	
	2004-01-24  Jan Hubicka  <jh@suse.cz>
	* emit-rtl.c (change_address, adjust_address_1, offset_address,
	widen_memory_access):  Return early when there is nothing to change.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=2.2326.2.174&r2=2.2326.2.175
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expr.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.615.4.2&r2=1.615.4.3
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/emit-rtl.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.365.4.1&r2=1.365.4.2
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/i386/i386.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.635.2.3&r2=1.635.2.4
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/i386/i386.md.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.502&r2=1.502.2.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/i386/i386-protos.h.diff?cvsroot=gcc&only_with_tag=gcc-3_4-branch&r1=1.104.4.1&r2=1.104.4.2



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13424