[Bug fortran/17675] New: Alignment constraints not honored in EQUIVALENCE

["ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

We have many execution failures on SPARC for the 980628-* series of testcases:

FAIL: gfortran.dg/g77/980628-0.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-0.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-0.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-0.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-0.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-0.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-0.f  -Os  execution test
FAIL: gfortran.dg/g77/980628-1.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-1.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-1.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-1.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-1.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-1.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-1.f  -Os  execution test
FAIL: gfortran.dg/g77/980628-10.f  -O0  execution test
FAIL: gfortran.dg/g77/980628-10.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-10.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-10.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-10.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-10.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-10.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-10.f  -Os  execution test
FAIL: gfortran.dg/g77/980628-2.f  -O0  execution test
FAIL: gfortran.dg/g77/980628-2.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-2.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-2.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-2.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-2.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-2.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-2.f  -Os  execution test
FAIL: gfortran.dg/g77/980628-3.f  -O0  execution test
FAIL: gfortran.dg/g77/980628-3.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-3.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-3.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-3.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-3.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-3.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-3.f  -Os  execution test
FAIL: gfortran.dg/g77/980628-7.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-7.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-7.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-7.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-7.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-7.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-7.f  -Os  execution test
FAIL: gfortran.dg/g77/980628-8.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-8.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-8.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-8.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-8.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-8.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-8.f  -Os  execution test
FAIL: gfortran.dg/g77/980628-9.f  -O0  execution test
FAIL: gfortran.dg/g77/980628-9.f  -O1  execution test
FAIL: gfortran.dg/g77/980628-9.f  -O2  execution test
FAIL: gfortran.dg/g77/980628-9.f  -O3 -fomit-frame-pointer  execution test
FAIL: gfortran.dg/g77/980628-9.f  -O3 -fomit-frame-pointer -funroll-loops 
execution test
FAIL: gfortran.dg/g77/980628-9.f  -O3 -fomit-frame-pointer -funroll-all-loops
-finline-functions  execution test
FAIL: gfortran.dg/g77/980628-9.f  -O3 -g  execution test
FAIL: gfortran.dg/g77/980628-9.f  -Os  execution test


It appears that the old bug mentioned in the head comment is back:

* g77 0.5.23 and previous had bugs involving too little space
* allocated for EQUIVALENCE and COMMON areas needing initial
* padding to meet alignment requirements of the system.


G95:
Program received signal SIGSEGV, Segmentation fault.
0x00010a94 in x_ (c1=0xffbefaa4, r1=@0xffbefaa5, c2=0xffbefab0,
    r2=@0xffbefab1, c3=0xffbefabc, r3=@0xffbefabd, c4=@0xffbefaa3,
    c5=@0xffbefaa1, c6=@0xffbefaa2, _c1=1, _c2=1, _c3=1, _c4=1, _c5=1, _c6=1)
    at 980628-2.f:44
44            if (r1 .ne. 1.) call abort

G77:
Breakpoint 1, x_ (c1=0xffbefaab, r1=0xffbefaac, c2=0xffbefa9b, r2=0xffbefa9c,
    c3=0xffbefa8b, r3=0xffbefa8c, c4=0xffbefa87, c5=0xffbefa86, c6=0xffbefa85,
    __g77_length_c1=1, __g77_length_c2=1, __g77_length_c3=1,
    __g77_length_c4=1, __g77_length_c5=1, __g77_length_c6=1) at 980628-2.f:44
44            if (r1 .ne. 1.) call abort

Note the discrepancy for the alignment of r1, r2 and r3.

-- 
           Summary: Alignment constraints not honored in EQUIVALENCE
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ebotcazou at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: sparc*-*-*
  GCC host triplet: sparc*-*-*
GCC target triplet: sparc*-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17675