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Date: Thu, 26 Apr 2007 12:26:00 -0000
Subject: [Bug c++/31714]  New: [4.1 regression] default_conversion ICE while processing_template_decl
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From: "jakub at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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template<short S>
void foo(void)
{
  const unsigned short m = S ? ((unsigned short) 0 | (unsigned short) 0) : 0;
  short t = 1 & m;
}

ICEs in:
#0  0x00000000005b136f in operand_equal_p (arg0=0x2aaaae123f60,
arg1=0x2aaaae123f90, flags=0) at ../../gcc/fold-const.c:2421
#1  0x00000000005b5792 in fold_binary (code=BIT_IOR_EXPR, type=0x2aaaae004420,
op0=0x2aaaae12d540, op1=0x2aaaae12d580)
    at ../../gcc/fold-const.c:8050
#2  0x00000000005bbde9 in fold_build2_stat (code=2919253024, type=0x0,
op0=0x74, op1=0x0) at ../../gcc/fold-const.c:10597
#3  0x00000000005445c6 in convert_to_integer (type=0x2aaaae004420, expr=<value
optimized out>) at ../../gcc/convert.c:641
#4  0x0000000000462e4a in ocp_convert (type=0x2aaaae004420, expr=<value
optimized out>, convtype=15, flags=35)
    at ../../gcc/cp/cvt.c:698
#5  0x00000000005445e9 in convert_to_integer (type=0x2aaaae004420,
expr=0x2aaaadff8730) at ../../gcc/convert.c:683
#6  0x0000000000462e4a in ocp_convert (type=0x2aaaae004420, expr=<value
optimized out>, convtype=15, flags=3)
    at ../../gcc/cp/cvt.c:698
#7  0x000000000045e349 in default_conversion (exp=0x2aaaae004420) at
../../gcc/cp/typeck.c:1435

as C++ specific trees (cast_expr in
 <bit_ior_expr 0x2aaaadff8780
    type <integer_type 0x2aaaae0044d0 int public type_6 SI
        size <integer_cst 0x2aaaadff2a20 constant invariant 32>
        unit size <integer_cst 0x2aaaadff2540 constant invariant 4>
        align 32 symtab 0 alias set -1 precision 32 min <integer_cst
0x2aaaadff2990 -2147483648> max <integer_cst 0x2aaaadff29c0 2147483647>
        pointer_to_this <pointer_type 0x2aaaae017790>>
    side-effects
    arg 0 <cast_expr 0x2aaaae12d540
        type <integer_type 0x2aaaae004420 short unsigned int public unsigned
type_6 HI
            size <integer_cst 0x2aaaadff2840 constant invariant 16>
            unit size <integer_cst 0x2aaaadff2870 constant invariant 2>
            align 16 symtab 0 alias set -1 precision 16 min <integer_cst
0x2aaaadff2960 0> max <integer_cst 0x2aaaadff2930 65535>>
        side-effects
        arg 0 <tree_list 0x2aaaae123f60
            value <integer_cst 0x2aaaae00f660 constant invariant 0>>>
    arg 1 <cast_expr 0x2aaaae12d580 type <integer_type 0x2aaaae004420 short
unsigned int>
        side-effects
        arg 0 <tree_list 0x2aaaae123f90 value <integer_cst 0x2aaaae00f660 0>>>>
are passed to convert_to_integer/fold.
This certainly didn't ICE in 3.2.3, and doesn't ICE in 4.2+ either
(I believe PR27506 made the difference here).


-- 
           Summary: [4.1 regression] default_conversion ICE while
                    processing_template_decl
           Product: gcc
           Version: 4.1.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31714