[Bug rtl-optimization/56494] [4.8 Regression] ICE in simplify_truncation, at simplify-rtx.c:619

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56494



--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-05 
06:04:23 UTC ---

Author: jakub

Date: Tue Mar  5 06:04:14 2013

New Revision: 196451



URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196451

Log:

    PR rtl-optimization/56494

    * simplify-rtx.c (simplify_truncation): If C is narrower than A,

    optimize (truncate:A (subreg:B (truncate:C X) 0)) into

    (subreg:A (truncate:C X) 0) instead of (truncate:A X).



    * gcc.dg/pr56494.c: New test.



Added:

    trunk/gcc/testsuite/gcc.dg/pr56494.c

Modified:

    trunk/gcc/ChangeLog

    trunk/gcc/simplify-rtx.c

    trunk/gcc/testsuite/ChangeLog