[Bug tree-optimization/56064] Optimize VIEW_CONVERT_EXPR with FIXED_CST

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56064

--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2013-01-30 11:04:35 UTC ---
Author: gjl
Date: Wed Jan 30 11:04:30 2013
New Revision: 195574

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195574
Log:
gcc/
    PR tree-optimization/56064
    * fixed-value.c (fixed_from_double_int): New function.
    * fixed-value.h (fixed_from_double_int): New prototype.
    (const_fixed_from_double_int): New static inline function.
    * fold-const.c (native_interpret_fixed): New static function.
    (native_interpret_expr) <FIXED_POINT_TYPE>: Use it.
    (can_native_interpret_type_p) <FIXED_POINT_TYPE>: Return true.
    (native_encode_fixed): New static function.
    (native_encode_expr) <FIXED_CST>: Use it.
    (native_interpret_int): Move double_int worker code to...
    * double-int.c (double_int::from_buffer): ...this new static method.
    * double-int.h (double_int::from_buffer): Prototype it.

gcc/testsuite/
    PR tree-optimization/56064
    * gcc.dg/fixed-point/view-convert.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/fixed-point/view-convert.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/double-int.c
    trunk/gcc/double-int.h
    trunk/gcc/fixed-value.c
    trunk/gcc/fixed-value.h
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog