------- Additional Comments From uros at gcc dot gnu dot org 2004-11-23 14:04
-------
Gcc crashes with this insn:
(insn 25 24 26 0 (set (reg:V4SF 60 [ D.1457 ])
(subreg:V4SF (vec_concat:V4SI (subreg:V2SI (float_truncate:V2SF
(reg:V2DF 73)) 0)
(const_vector:V2SI [
(const_int 0 [0x0])
(const_int 0 [0x0])
])) 0)) -1 (nil)
(nil))
n_elts is calculated as 4, but op0_n_elts and op1_n_elts are 2 (which is kind of
obvious for vec_concat). Because a constant is loaded to (reg 73), the whole
insn simplifies to vec_concat of two constant 2-element vectors.
This triggers the asserts:
gcc_assert (op0_n_elts == n_elts);
gcc_assert (op1_n_elts == n_elts);
The fix would be to prevent an entry of vec_concat into
simplify_binary_operation().
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18614
