[Bug tree-optimization/59757] New: Unexpected VN_TOP in SSCVN

[joey.ye at arm dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59757

            Bug ID: 59757
           Summary: Unexpected VN_TOP in SSCVN
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joey.ye at arm dot com

Created attachment 31796
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31796&action=edit
Reduced test case

target: arm-none-eabi
host: Only Windows (crossbuild with i586-mingw32msvc). The same revision
doesn't fail on Linux
GCC revision: trunk 20141009 and 4.8
Option: -O3

> arm-none-eabi-gcc -O3 foo.c
foo.c: In function 'univision_ug2828gfeff01_init':
foo.c:119:1: internal compiler error: tree check: expected ssa_name, have
var_de
cl in vn_reference_lookup_2, at tree-ssa-sccvn.c:1497
 univision_ug2828gfeff01_init(CTL_GFX_SEP_DRIVER_t *d, int depth)
 ^

foo.c:119:1: internal compiler error: Segmentation fault