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Subject: [Bug lto/55066] New: lto integer-cst change causes ICE
Date: Wed, 24 Oct 2012 22:17:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55066

             Bug #: 55066
           Summary: lto integer-cst change causes ICE
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: andi-gcc@firstfloor.org


A large LTO allyes kernel build (no small test case 
unfortunately) recently started ICEing during the LTO phase with

linux-lto-2.6/drivers/isdn/hardware/eicon/message.c:12035:0: internal compiler
error: in widest_int_cst_value, at tree.c:10214
 static byte mixer_request(dword Id, word Number, DIVA_CAPI_ADAPTER *a, PLCI
*plci, APPL   *appl, API_PARSE *msg)
 ^
0x8c05f8 widest_int_cst_value(tree_node const*)
        ../../gcc/gcc/tree.c:10213
0x81987f find_bswap_1
        ../../gcc/gcc/tree-ssa-math-opts.c:1669
0x819a23 find_bswap_1
        ../../gcc/gcc/tree-ssa-math-opts.c:1733
0x81a194 find_bswap
        ../../gcc/gcc/tree-ssa-math-opts.c:1779
0x81a194 execute_optimize_bswap
        ../../gcc/gcc/tree-ssa-math-opts.c:1905
Please submit a full bug report,



I bisected it down to this change from Richi:

    2012-10-18  Richard Guenther  <rguenther@suse.de>

        * lto-streamer.h (enum LTO_tags): Add LTO_integer_cst.
        * lto-streamer-in.c (lto_input_tree): Use it.
        * lto-streamer-out.c (lto_output_tree): Likewise, for
        !TREE_OVERFLOW integer constants only.
        * tree-streamer-in.c (unpack_ts_int_cst_value_fields): New function.
        (unpack_value_fields): Call it.
        (streamer_read_integer_cst): Simplify.
        * tree-streamer-out.c (pack_ts_int_cst_value_fields): New function.
        (streamer_pack_tree_bitfields): Call it.
        (streamer_write_integer_cst): Adjust.