[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[cvs-commit at gcc dot gnu dot org]

--- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-03-02 
16:05 ---
Subject: Bug 18029

CVSROOT:/cvs/gcc
Module name:gcc
Changes by: [EMAIL PROTECTED]   2005-03-02 16:05:00

Modified files:
gcc: ChangeLog expr.c 

Log message:
PR middle-end/18029 and PR middle-end/18030
* expr.c (optimize_bitfield_assignment_op): Add a special case
to handle BIT_IOR_EXPR and BIT_XOR_EXPR.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gccr1=2.7632r2=2.7633
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/expr.c.diff?cvsroot=gccr1=1.778r2=1.779



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029

[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[kazu at cs dot umass dot edu]

--- Additional Comments From kazu at cs dot umass dot edu  2005-03-02 16:07 
---
Just checked in a patch.

-- 
   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution||FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029

[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[pinskia at gcc dot gnu dot org]

-- 
   What|Removed |Added

   Target Milestone|--- |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029

[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[giovannibajo at libero dot it]

--- Additional Comments From giovannibajo at libero dot it  2004-10-17 11:26 
---
Approved for 4.1.

-- 
   What|Removed |Added

OtherBugsDependingO||17652
  nThis||


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029

[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[kazu at cs dot umass dot edu]

--- Additional Comments From kazu at cs dot umass dot edu  2004-10-16 15:49 ---
A patch here:
http://gcc.gnu.org/ml/gcc-patches/2004-10/msg01333.html


-- 
   What|Removed |Added

   Keywords||patch


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029

[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[kazu at cs dot umass dot edu]

-- 
   What|Removed |Added

Summary|a twiddleing of a   |an xor of a single bit
   ||bitfield is inefficient


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029

[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[pinskia at gcc dot gnu dot org]

--- Additional Comments From pinskia at gcc dot gnu dot org  2004-10-16 03:05 
---
Confirmed on PPC also.  (note for PPC to get about the same code we have to use the 
following 
definition for the struct:
struct B {
  unsigned unused: 31;
  unsigned bit : 1;
};

).

-- 
   What|Removed |Added

 Status|UNCONFIRMED |NEW
 Ever Confirmed||1
   Last reconfirmed|-00-00 00:00:00 |2004-10-16 03:05:12
   date||
Version|unknown |4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029