[Bug target/115373] New: [15 Regression] RISCV slp-cond-2-big-array.c slp-cond-2.c scan-tree-dump fails since r15-859-geaaa4b88038

[Bug target/115373] New: [15 Regression] RISCV slp-cond-2-big-array.c slp-cond-2.c scan-tree-dump fails since r15-859-geaaa4b88038

[patrick at rivosinc dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115373

            Bug ID: 115373
           Summary: [15 Regression] RISCV slp-cond-2-big-array.c
                    slp-cond-2.c scan-tree-dump fails since
                    r15-859-geaaa4b88038
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: patrick at rivosinc dot com
  Target Milestone: ---

Commit range (2 possible commits):
r15-858-g65aa46ffc3b
r15-859-geaaa4b88038 < 99.9% sure it's this one since it updated the test
expectations

Regressed:

FAIL: gcc.dg/vect/slp-cond-2-big-array.c -flto -ffat-lto-objects 
scan-tree-dump-times vect "vectorizing stmts using SLP" 4
FAIL: gcc.dg/vect/slp-cond-2-big-array.c scan-tree-dump-times vect "vectorizing
stmts using SLP" 4
FAIL: gcc.dg/vect/slp-cond-2.c -flto -ffat-lto-objects  scan-tree-dump-times
vect "vectorizing stmts using SLP" 4
FAIL: gcc.dg/vect/slp-cond-2.c scan-tree-dump-times vect "vectorizing stmts
using SLP" 4

Debug output:
gcc.dg/vect/slp-cond-2-big-array.c -flto -ffat-lto-objects : pattern found 3
times
FAIL: gcc.dg/vect/slp-cond-2-big-array.c -flto -ffat-lto-objects 
scan-tree-dump-times vect "vectorizing stmts using SLP" 4
gcc.dg/vect/slp-cond-2-big-array.c: pattern found 3 times
FAIL: gcc.dg/vect/slp-cond-2-big-array.c scan-tree-dump-times vect "vectorizing
stmts using SLP" 4
gcc.dg/vect/slp-cond-2.c -flto -ffat-lto-objects : pattern found 3 times
FAIL: gcc.dg/vect/slp-cond-2.c -flto -ffat-lto-objects  scan-tree-dump-times
vect "vectorizing stmts using SLP" 4
gcc.dg/vect/slp-cond-2.c: pattern found 3 times
FAIL: gcc.dg/vect/slp-cond-2.c scan-tree-dump-times vect "vectorizing stmts
using SLP" 4

[Bug target/115373] [15 Regression] RISCV slp-cond-2-big-array.c slp-cond-2.c scan-tree-dump fails since r15-859-geaaa4b88038

[patrick at rivosinc dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115373

--- Comment #1 from Patrick O'Neill <patrick at rivosinc dot com> ---
Relevant postcommit issue:
https://github.com/patrick-rivos/gcc-postcommit-ci/issues/999

[Bug target/115373] [15 Regression] RISCV slp-cond-2-big-array.c slp-cond-2.c scan-tree-dump fails since r15-859-geaaa4b88038

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115373

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |15.0
                 CC|                            |rguenth at gcc dot gnu.org
             Target|                            |riscv
           Keywords|                            |testsuite-fail

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
This also wasn't seen in precommit CI.  I can confirm it on trunk and the
issue is that we prefer load-lanes for f3 instead of SLP.

This issue will go away when we do load-lanes from SLP, so it's intermittent
(but I can't promise any timeline).  I wonder if the FAIL also occurs on
aarch64.  There's vect_load_lanes to eventually "fix" the FAIL by adjusting
the testcase expectation.

[Bug target/115373] [15 Regression] RISCV slp-cond-2-big-array.c slp-cond-2.c scan-tree-dump fails since r15-859-geaaa4b88038

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115373

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|riscv                       |riscv, aarch64

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Same on aarch64.

[Bug target/115373] [15 Regression] RISCV slp-cond-2-big-array.c slp-cond-2.c scan-tree-dump fails since r15-859-geaaa4b88038

[thiago.bauermann at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115373

Thiago Jung Bauermann <thiago.bauermann at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thiago.bauermann at linaro dot org

--- Comment #4 from Thiago Jung Bauermann <thiago.bauermann at linaro dot org> ---
We also see it on arm --with-mode=thumb.

FWIW this is being tracked in the Linaro CI at:

https://linaro.atlassian.net/browse/GNU-1222