[Bug middle-end/54315] unnecessary copy of return value for union

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54315



--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-10-20 
21:00:26 UTC ---

Author: ebotcazou

Date: Sat Oct 20 21:00:23 2012

New Revision: 192641



URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192641

Log:

    PR rtl-optimization/54315

    * calls.c (expand_call): Don't deal specifically with BLKmode values

    returned in naked registers.

    * expr.h (copy_blkmode_from_reg): Adjust prototype.

    * expr.c (copy_blkmode_from_reg): Rename first parameter into TARGET and

    make it required.  Assert that SRCREG hasn't BLKmode.  Add a couple of 

    short-circuits for common cases and be prepared for sub-word registers.

    (expand_assignment): Call copy_blkmode_from_reg for BLKmode values

    returned in naked registers.

    (store_expr): Likewise.

    (store_field): Likewise.



Modified:

    trunk/gcc/ChangeLog

    trunk/gcc/calls.c

    trunk/gcc/expr.c

    trunk/gcc/expr.h