[Bug regression/51510] New: [4.6/4.7 regression] gcc for arm-linux-gnueabi ICEs on gcc.c-torture/execute/20050713-1.c due to PR50074+PR51323 fix

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51510

             Bug #: 51510
           Summary: [4.6/4.7 regression] gcc for arm-linux-gnueabi ICEs on
                    gcc.c-torture/execute/20050713-1.c due to
                    PR50074+PR51323 fix
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mikpe@it.uu.se


The PR50074+PR51323 fix, r182112 on 4.6 branch, caused a test suite regression
on arm-linux-gnueabi:

+FAIL: gcc.c-torture/execute/20050713-1.c compilation,  -O2  (internal compiler
error)
+UNRESOLVED: gcc.c-torture/execute/20050713-1.c execution,  -O2
+FAIL: gcc.c-torture/execute/20050713-1.c compilation,  -Os  (internal compiler
error)
+UNRESOLVED: gcc.c-torture/execute/20050713-1.c execution,  -Os

because the compiler now ICEs:

20050713-1.c: In function 'bar3':
20050713-1.c:38:3: internal compiler error: in calculate_allocation, at
vec.c:183

The same ICE also happens with 4.7-20111210.