[Bug optimization/11059] [3.3 regression] empty union optimization ice

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11059



------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-07-16 11:42 -------
Subject: Bug 11059

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-3_2-rhl8-branch
Changes by:	jakub@gcc.gnu.org	2003-07-16 11:42:39

Modified files:
	gcc            : ChangeLog expr.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/opt: emptyunion.C 

Log message:
	2003-07-07  Roger Sayle  <roger@eyesopen.com>
	
	PR optimization/11059
	* expr.c (can_store_by_pieces): Return true if length is zero.
	(store_by_pieces): If length is zero and endp is two, abort,
	othwerise, if length is zero and endp is not two, return "to".
	(clear_by_pieces): Do nothing if length is zero.
	(clear_storage): Do nothing if length is zero.
	(store_constructor): Simplify code when size is zero, or the
	target has already been cleared.  This avoids emitting a
	blockage instruction when initializing empty structures.
	
	2003-07-07  Roger Sayle  <roger@eyesopen.com>
	
	PR optimization/11059
	* g++.dg/opt/emptyunion.C: New testcase.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=1.13152.2.657.2.27.2.143&r2=1.13152.2.657.2.27.2.144
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expr.c.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=1.423.2.19.4.1.2.16&r2=1.423.2.19.4.1.2.17
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=1.1672.2.166.2.8.2.57&r2=1.1672.2.166.2.8.2.58
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/opt/emptyunion.C.diff?cvsroot=gcc&only_with_tag=gcc-3_2-rhl8-branch&r1=NONE&r2=1.1.8.1