[Bug rtl-optimization/32374] New: dataflow bug: internal compiler error: in reload_cse_simplify_operands, at postreload.c:396

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

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Current mainline GCC ICEs when compiling attached testcase:

g++ -O2 037.cpp

037.cpp: In function ‘void unix_parse_conf_file(FILE*, const char*, bool)’:
037.cpp:58: error: insn does not satisfy its constraints:
(insn 50 45 10 2 (set (reg/f:DI 54 virtual-stack-vars)
        (reg:DI 0 ax)) 82 {*movdi_1_rex64} (nil))
037.cpp:58: internal compiler error: in reload_cse_simplify_operands, at
postreload.c:396
Please submit a full bug report,

This invalid RTL is created by new init-regs pass, trying to initialize
virtual-stack-vars:

(insn 45 6 9 2 (set (reg/f:DI 54 virtual-stack-vars)
        (const_int 0 [0x0])) -1 (nil))

(insn 9 45 10 2 037.cpp:50 (clobber (mem/s/c:BLK (plus:DI (reg/f:DI 54
virtual-stack-vars)
                (const_int -16 [0xfffffffffffffff0])) [4 A128])) -1 (nil))


-- 
           Summary: dataflow bug: internal compiler error: in
                    reload_cse_simplify_operands, at postreload.c:396
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ubizjak at gmail dot com
 GCC build triplet: x86_64-pc-gnu-linux
  GCC host triplet: x86_64-pc-gnu-linux
GCC target triplet: x86_64-pc-gnu-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32374