[Bug middle-end/55116] New: [4.8 Regression] LRA failed to decompose ASHIFT

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55116

             Bug #: 55116
           Summary: [4.8 Regression] LRA failed to decompose ASHIFT
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com
                CC: ubizjak@gmail.com, vmakarov@redhat.com


[hjl@gnu-tools-1 tmp]$ /usr/gcc-4.8.0-x32/bin/gcc -S -O2 -w -S -mx32 
/export/gnu/import/git/gcc/gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-3.c
-maddress-mode=long
/export/gnu/import/git/gcc/gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-3.c:
In function ‘expr_vol_global’:
/export/gnu/import/git/gcc/gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-3.c:100:1:
internal compiler error: in gen_add2_insn, at optabs.c:4694
 }
 ^
0x81fe4b gen_add2_insn(rtx_def*, rtx_def*)
    /export/gnu/import/git/gcc/gcc/optabs.c:4694
0x7e2dc7 lra_emit_add(rtx_def*, rtx_def*, rtx_def*)
    /export/gnu/import/git/gcc/gcc/lra.c:314
0x7eba63 process_addr_reg
    /export/gnu/import/git/gcc/gcc/lra-constraints.c:1092
0x7ebeed process_address
    /export/gnu/import/git/gcc/gcc/lra-constraints.c:2290
0x7ef52f curr_insn_transform
    /export/gnu/import/git/gcc/gcc/lra-constraints.c:2656
0x7f1984 lra_constraints(bool)
    /export/gnu/import/git/gcc/gcc/lra-constraints.c:3407
0x7e534e lra(_IO_FILE*)
    /export/gnu/import/git/gcc/gcc/lra.c:2281
0x7ad7f6 do_reload
    /export/gnu/import/git/gcc/gcc/ira.c:4614
0x7ad7f6 rest_of_handle_reload
    /export/gnu/import/git/gcc/gcc/ira.c:4720
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
[hjl@gnu-tools-1 tmp]$ 

Breakpoint 1, lra_emit_add (x=0x7ffff1adb440, y=0x7ffff1ae41b0, 
    z=0x7ffff1ad7b00) at /export/gnu/import/git/gcc/gcc/lra.c:313
313          emit_move_insn (x, z);
(gdb) call debug_rtx (x)
(reg:SI 206)
(gdb) call debug_rtx (y)
(ashift:SI (reg:SI 96 [ glob_vol_int.22 ])
    (const_int 2 [0x2]))
(gdb)