https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110598
Roger Sayle <roger at nextmovesoftware dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |roger at
nextmovesoftware dot com
Status|NEW |ASSIGNED
--- Comment #4 from Roger Sayle <roger at nextmovesoftware dot com> ---
Mine. The new peephole2 is misbehaving with the (odd) RTL sequence:
(insn 62 61 63 2 (set (reg:DI 1 dx [111])
(const_int 0 [0])) "pr110598.c":10:10 90 {*movdi_internal}
(insn 63 62 64 2 (parallel [
(set (reg:DI 1 dx [110])
(xor:DI (reg:DI 1 dx [111])
(reg:DI 1 dx)))
(clobber (reg:CC 17 flags))
]) "pr110598.c":10:10 626 {*xordi_1}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))
Doh! I need to confirm/check that rega != regb. Interesting that DF doesn't
consider insn 62 as REG_UNUSED (i.e. dead), a classic false dependency.
