[Bug rtl-optimization/55717] [4.8 Regression] ICE in form_sum, at reload.c:5400

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55717



--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-12-18 
10:50:51 UTC ---

Author: jakub

Date: Tue Dec 18 10:50:47 2012

New Revision: 194575



URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=194575

Log:

    PR debug/55717

    * rtlhooks-def.h (RTL_HOOKS_GEN_LOWPART_NO_EMIT): Define to

    gen_lowpart_if_possible.

    (gen_lowpart_no_emit_general): Remove prototype.

    * rtlhooks.c (gen_lowpart_no_emit_general): Removed.

    * simplify-rtx.c (simplify_unary_operation_1, 

    simplify_binary_operation_1): Continue simplifying if

    rtl_hooks.gen_lowpart_no_emit returns NULL_RTX.

    * dwarf2out.c (mem_loc_descriptor) <case TRUNCATE>: Handle

    truncation like lowpart SUBREG.



    * testsuite/g++.dg/opt/pr55717.C: New test.



Added:

    trunk/gcc/testsuite/g++.dg/opt/pr55717.C

Modified:

    trunk/gcc/ChangeLog

    trunk/gcc/dwarf2out.c

    trunk/gcc/rtlhooks-def.h

    trunk/gcc/rtlhooks.c

    trunk/gcc/simplify-rtx.c

    trunk/gcc/testsuite/ChangeLog