[Bug target/27566] New: [4.1/4.2 Regression] ICEs in final_scan_insn and reload_cse_simplify_operands for vectors with SPE

["jsm28 at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Some GCC tests such as gcc.c-torture/execute/simd-5.c fail on
powerpc-none-eabispe with an ICE in final_scan_insn (not optimizing) or
reload_cse_simplify_operands (optimizing).  This happens with trunk and 4.1
branch but not with 4.0 branch.  Reduced testcase:

typedef short Q __attribute__((vector_size(8)));

Q a, b, c;

void
f (void)
{
  c = a * b;
}

Non-optimizing:
t.c: In function 'f':
t.c:9: error: insn does not satisfy its constraints:
(insn 45 74 75 (set (reg:V4HI 0 0 [158])
        (mem/u/c/i:V4HI (lo_sum:SI (reg:SI 10 10)
                (symbol_ref/u:SI ("*.LC0") [flags 0x2])) [0 S8 A64])) 1059
{*movv4hi_internal} (nil)
    (nil))
t.c:9: internal compiler error: in final_scan_insn, at final.c:2379
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

With -O:
t.c: In function 'f':
t.c:9: error: insn does not satisfy its constraints:
(insn 18 68 66 2 (set (reg:V4HI 0 0 [127])
        (mem/u/c/i:V4HI (lo_sum:SI (reg:SI 6 6)
                (symbol_ref/u:SI ("*.LC0") [flags 0x82])) [0 S8 A64])) 1059
{*movv4hi_internal} (nil)
    (nil))
t.c:9: internal compiler error: in reload_cse_simplify_operands, at
postreload.c:393
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: [4.1/4.2 Regression] ICEs in final_scan_insn and
                    reload_cse_simplify_operands for vectors with SPE
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jsm28 at gcc dot gnu dot org
GCC target triplet: powerpc*-*-*spe


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27566