[Bug rtl-optimization/50765] [4.7 Regression] ICE: in expand_insn, at optabs.c:7681 with -ftree-vectorize -fno-tree-dce

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50765

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |jakub at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-11-22 10:50:08 UTC ---
Created attachment 25879
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25879
gcc47-pr50765-test.patch

Fixed by part of my http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180932
change, in particular vectorizable_type_promotion has been mishandling ncopies
> 1 - vect_create_vectorized_promotion_stmts would always grow vec_oprnd[01]
vectors if multi_step_cvt, but nothing would truncate them and we'd just
replace
the first element in those vectors, so for ncopies 2 (in this case) we have one
extra element in the vectors to promote.

I'll just add the testcase to the testsuite after regtesting it and then close
this.