http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50677
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Combine generates
Trying 6, 7 -> 8:
Failed to match this instruction:
(set (mem/v:SI (reg/v/f:DI 85 [ i ]) [2 *i_2(D)+0 S4 A32])
(plus:SI (mem/v:SI (reg/v/f:DI 85 [ i ]) [2 *i_2(D)+0 S4 A32])
(const_int 1 [0x1])))
from
(insn 6 3 7 2 (set (reg:SI 83 [ D.1752 ])
(mem/v:SI (reg/v/f:DI 85 [ i ]) [2 *i_2(D)+0 S4 A32])) x.i:1 90
{*movsi_
internal}
(nil))
(insn 7 6 8 2 (parallel [
(set (reg:SI 84 [ D.1752 ])
(plus:SI (reg:SI 83 [ D.1752 ])
(const_int 1 [0x1])))
(clobber (reg:CC 17 flags))
]) x.i:1 266 {*addsi_1}
(expr_list:REG_DEAD (reg:SI 83 [ D.1752 ])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))
Why doesn't combine include (clobber (reg:CC 17 flags))?
