[Bug tree-optimization/119057] [12/13/14 regression] ICE at -O{2,3} with "-fno-tree-vrp -fno-tree-forwprop" on x86_64-linux-gnu: in operator[], at vec.h:910 since r15-1055

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119057

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |15.0
            Summary|[15 regression] ICE at      |[12/13/14 regression] ICE
                   |-O{2,3} with "-fno-tree-vrp |at -O{2,3} with
                   |-fno-tree-forwprop" on      |"-fno-tree-vrp
                   |x86_64-linux-gnu: in        |-fno-tree-forwprop" on
                   |operator[], at vec.h:910    |x86_64-linux-gnu: in
                   |since r15-1055              |operator[], at vec.h:910
                   |                            |since r15-1055
           Keywords|                            |fixed-but-no-testcase,
                   |                            |wrong-code
           Priority|P1                          |P2
   Target Milestone|15.0                        |12.5

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the issue goes back much longer, it was first partly fixed by
r11-4865-g2686de5617bfb5

I'm queueing this for backports, even without having a wrong-code testcase
(the outer loop use lacks a inner loop reduction "epilogue").