[Bug rtl-optimization/60024] global-buffer-overflow in init_regs_for_mode

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60024

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-02-01
                 CC|                            |abel at ispras dot ru
   Target Milestone|---                         |4.9.0
     Ever confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #0)
> When GCC is bootstrapped with --with-build-config=bootstrap-asan
> r207375 gave
> 
> spawn -ignore SIGHUP
> /export/build/gnu/gcc-asan/build-x86_64-linux/gcc/testsuite/gfortran3/../../
> gfortran
> -B/export/build/gnu/gcc-asan/build-x86_64-linux/gcc/testsuite/gfortran3/../..
> /
> -B/export/build/gnu/gcc-asan/build-x86_64-linux/x86_64-unknown-linux-gnu/32/
> libgfortran/
> /export/gnu/import/git/sources/gcc/gcc/testsuite/gfortran.dg/pr42294.f
> -fno-diagnostics-show-caret -fdiagnostics-color=never -O -O2
> -fselective-scheduling2 -fsel-sched-pipelining -funroll-all-loops -S -m32 -o
> pr42294.s^M
> =================================================================^M
> ^[[1m^[[31m==9831==ERROR: AddressSanitizer: global-buffer-overflow on
> address 0x000003deb6cd at pc 0x12f89cf bp 0x7ffffba71eb0 sp 0x7ffffba71ea8^M
> ^[[1m^[[0m^[[1m^[[34mREAD of size 1 at 0x000003deb6cd thread T0^[[1m^[[0m^M
>     #0 0x12f89ce in init_regs_for_mode
> /export/gnu/import/git/sources/gcc/gcc/sel-sched.c:1124^M

(gdb) call ix86_hard_regno_mode_ok (cur_reg, mode)
$6 = false
(gdb) p cur_reg
$7 = 76
(gdb) p mode
$8 = DFmode
(gdb) p nregs
$9 = 2
(gdb) call ix86_hard_regno_mode_ok (cur_reg, mode)
$10 = false
(gdb)