[Bug target/50202] New: ICE: in final_scan_insn, at final.c:2709 (could not split insn) with __builtin_ia32_pcmpistri128

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50202

             Bug #: 50202
           Summary: ICE: in final_scan_insn, at final.c:2709 (could not
                    split insn) with __builtin_ia32_pcmpistri128
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 25113
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25113
reduced testcase

Compiler output:
$ gcc -O -mf16c -fno-dce -fno-tree-dse testcase.c 
testcase.c: In function 'foo':
testcase.c:10:1: error: could not split insn
(insn 6 5 9 2 (parallel [
            (set (reg:SI 2 cx [61])
                (unspec:SI [
                        (reg:V16QI 21 xmm0 [orig:59 v.0 ] [59])
                        (reg:V16QI 21 xmm0 [orig:59 v.0 ] [59])
                        (const_int 255 [0xff])
                    ] UNSPEC_PCMPISTR))
            (set (reg:V16QI 21 xmm0 [62])
                (unspec:V16QI [
                        (reg:V16QI 21 xmm0 [orig:59 v.0 ] [59])
                        (reg:V16QI 21 xmm0 [orig:59 v.0 ] [59])
                        (const_int 255 [0xff])
                    ] UNSPEC_PCMPISTR))
            (set (reg:CC 17 flags)
                (unspec:CC [
                        (reg:V16QI 21 xmm0 [orig:59 v.0 ] [59])
                        (reg:V16QI 21 xmm0 [orig:59 v.0 ] [59])
                        (const_int 255 [0xff])
                    ] UNSPEC_PCMPISTR))
        ]) testcase.c:8 1767 {sse4_2_pcmpistr}
     (expr_list:REG_UNUSED (reg:V16QI 21 xmm0 [62])
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (expr_list:REG_UNUSED (reg:SI 2 cx [61])
                (nil)))))
testcase.c:10:1: internal compiler error: in final_scan_insn, at final.c:2709
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r178096 - crash
4.6 r177922 - crash