Re: New jump threading issue

2018-12-10 Thread Segher Boessenkool
On Mon, Dec 10, 2018 at 02:05:57PM +, Andrew Stubbs wrote: > On 07/12/2018 22:41, Segher Boessenkool wrote: > >On Fri, Dec 07, 2018 at 05:57:39PM +, Andrew Stubbs wrote: > >>Since the postreload_jump pass was added I'm having trouble with the AMD > >>GCN port. > > > >[ snip a lot ] > > > >I

Re: New jump threading issue

2018-12-10 Thread Andrew Stubbs
On 07/12/2018 22:41, Segher Boessenkool wrote: On Fri, Dec 07, 2018 at 05:57:39PM +, Andrew Stubbs wrote: Since the postreload_jump pass was added I'm having trouble with the AMD GCN port. [ snip a lot ] It seems thread_jump does not notice your scc in its "nonequal" regset, so it thinks

Re: New jump threading issue

2018-12-07 Thread Segher Boessenkool
On Fri, Dec 07, 2018 at 05:57:39PM +, Andrew Stubbs wrote: > Since the postreload_jump pass was added I'm having trouble with the AMD > GCN port. [ snip a lot ] It seems thread_jump does not notice your scc in its "nonequal" regset, so it thinks every later jump is based on the same scc sett

New jump threading issue

2018-12-07 Thread Andrew Stubbs
Since the postreload_jump pass was added I'm having trouble with the AMD GCN port. I have the following, after reload (RTL slightly simplified!): (insn (set (reg scc) (gtu (reg s26) (reg s25 (jump_insn (set pc (if_then_else (ne scc 0)) (label_ref 46) pc))) . (insn (set (reg scc) (eq (re