[Bug middle-end/21318] New: [4.1 Regression] ICE in instantiate_virtual_regs_in_insn

["jsm28 at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following test failures appeared on ia64-hpux (-milp32 only) between
20050429 and 20050430.  Both are cc1 segmentation faults in
instantiate_virtual_regs_in_insn, which can be reproduced with a cross-compiler cc1.

0x08330cf4 in instantiate_virtual_regs_in_insn (insn=0x401b51b8)
    at ../../gcc-cvs-mainline/gcc/function.c:1488
1488              x = simplify_gen_subreg (insn_data[insn_code].operand[i].mode,

FAIL: gcc.dg/tree-ssa/20031015-1.c (test for excess errors)
FAIL: gcc.dg/tree-ssa/stdarg-2.c (test for excess errors)
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump f10: va_list escapes 1, needs to
save all GPR units
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump f11: va_list escapes 0, needs to
save (3|12|24) GPR units
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump f12: va_list escapes 0, needs to
save [1-9][0-9]* GPR units
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump f13: va_list escapes 0, needs to
save [1-9][0-9]* GPR units
FAIL: gcc.dg/tree-ssa/stdarg-2.c scan-tree-dump f14: va_list escapes 0, needs to
save [1-9][0-9]* GPR units

Binary search shows the 20031015-1.c failure appeared between 2005-04-30 03:15
UTC and 2005-04-30 04:56 UTC, i.e. was caused by

2005-04-29  Richard Henderson  <rth@redhat.com>

        * function.c (instantiate_decls): Remove valid_only argument.
        (instantiate_decls_1, instantiate_decl): Likewise.
        (instantiate_virtual_regs_1): Delete.
        (instantiate_virtual_regs_lossage): Delete.
        (instantiate_virtual_regs_in_rtx): New.
        (safe_insn_predicate): New.
        (instantiate_virtual_regs_in_insn): New.
        (instantiate_virtual_regs): Update to match all that.  Only run
        instantiate_decls once.

The binary search for the stdarg-2.c failure is still running but I expect it
will prove to be caused by the same patch.

-- 
           Summary: [4.1 Regression] ICE in instantiate_virtual_regs_in_insn
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jsm28 at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org,rth at gcc dot gnu dot
                    org
GCC target triplet: ia64-*-hpux11.*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21318