[Bug c/3325] cast of bit-field to same type gets discarded

["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  2004-07-08 08:44 -------
Subject: Bug 3325

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	jsm28@gcc.gnu.org	2004-07-08 08:44:24

Modified files:
	gcc            : c-common.c c-decl.c c-lang.c expr.c 
	                 langhooks-def.h langhooks.h tree-ssa.c tree.c 
	                 tree.h 
	gcc/objc       : objc-act.c objc-lang.c 
	gcc/testsuite  : ChangeLog 
	gcc/testsuite/gcc.dg: bitfld-2.c 
Added files:
	gcc/testsuite/gcc.c-torture/execute: bitfld-3.c 
Removed files:
	gcc/testsuite/gcc.c-torture/execute: bitfld-1.x 

Log message:
	2004-07-08  Joseph S. Myers  <jsm@polyomino.org.uk>
	Neil Booth  <neil@daikokuya.co.uk>
	
	PR c/2511
	PR c/3325
	* c-decl.c (finish_struct): Ensure bit-fields are given the
	correct type.
	* c-common.c (c_common_signed_or_unsigned_type): For C, require
	the precision to match as well as the mode.
	* expr.c (reduce_to_bit_field_precision): New function.
	(expand_expr_real_1): Reduce expressions of bit-field type to
	proper precision.
	* langhooks.h (reduce_bit_field_operations): New hook.
	* langhooks-def.h (LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS):
	Define.
	* c-lang.c, objc/objc-lang.c
	(LANG_HOOKS_REDUCE_BIT_FIELD_OPERATIONS): Define.
	* objc/objc-act.c (check_ivars): Convert types to bit-field types
	before checking.
	* tree.c (build_nonstandard_integer_type): New function.
	* tree.h (build_nonstandard_integer_type): New prototype.
	* tree-ssa.c (tree_ssa_useless_type_conversion_1): Don't treat
	conversions between integer and boolean types as useless.
	
	testsuite:
	* gcc.c-torture/execute/bitfld-1.x: Remove.
	* gcc.c-torture/execute/bitfld-3.c: New test.
	* gcc.dg/bitfld-2.c: Remove XFAILs.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-common.c.diff?cvsroot=gcc&r1=1.527&r2=1.528
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-decl.c.diff?cvsroot=gcc&r1=1.528&r2=1.529
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-lang.c.diff?cvsroot=gcc&r1=1.129&r2=1.130
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expr.c.diff?cvsroot=gcc&r1=1.673&r2=1.674
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/langhooks-def.h.diff?cvsroot=gcc&r1=1.83&r2=1.84
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/langhooks.h.diff?cvsroot=gcc&r1=1.89&r2=1.90
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-ssa.c.diff?cvsroot=gcc&r1=2.19&r2=2.20
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree.c.diff?cvsroot=gcc&r1=1.391&r2=1.392
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree.h.diff?cvsroot=gcc&r1=1.546&r2=1.547
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/objc/objc-act.c.diff?cvsroot=gcc&r1=1.229&r2=1.230
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/objc/objc-lang.c.diff?cvsroot=gcc&r1=1.47&r2=1.48
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.3950&r2=1.3951
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/bitfld-3.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/bitfld-1.x.diff?cvsroot=gcc&r1=1.1&r2=NONE
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/bitfld-2.c.diff?cvsroot=gcc&r1=1.2&r2=1.3



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3325