[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 08:46 -------
Subject: Bug 3325

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	jsm28@gcc.gnu.org	2004-07-08 08:45:55

Modified files:
	gcc            : ChangeLog 

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/ChangeLog.diff?cvsroot=gcc&r1=2.4372&r2=2.4373



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