[Bug target/115375] New: [15 Regression] RISCV scan failures since 2024-05-04

[Bug target/115375] New: [15 Regression] RISCV scan failures since 2024-05-04

[patrick at rivosinc dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115375

            Bug ID: 115375
           Summary: [15 Regression] RISCV scan failures since 2024-05-04
           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:
https://github.com/gcc-mirror/gcc/compare/4d207044195b97ecb27c72a7dc987eb8b86644a0...00fb385a25a7fbaa9c7060ddd5f41a8c3b1548d1

Good: r15-1003-g4d207044195
Bad: r15-1010-g00fb385a25a

Regressions:
FAIL: gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul8-8.c scan-assembler-not csrr
FAIL: gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul8-9.c scan-assembler-not csrr
FAIL: gcc.dg/vect/costmodel/riscv/rvv/dynamic-lmul8-9.c scan-tree-dump-times
vect "Maximum lmul = 8" 2
FAIL: gcc.target/riscv/rvv/autovec/cond/cond_widen_reduc-2.c
scan-assembler-times \\tvfwredusum\\.vs\\tv[0-9]+,v[0-9]+,v[0-9]+,v0\\.t 3
FAIL: gcc.target/riscv/rvv/autovec/cond/cond_widen_reduc-2.c
scan-assembler-times \\tvsext\\.vf4\\tv[0-9]+,v[0-9]+,v0\\.t 2
FAIL: gcc.target/riscv/rvv/autovec/cond/cond_widen_reduc-2.c
scan-assembler-times \\tvsext\\.vf8\\tv[0-9]+,v[0-9]+,v0\\.t 1
FAIL: gcc.target/riscv/rvv/autovec/cond/cond_widen_reduc-2.c
scan-assembler-times \\tvwredsum\\.vs\\tv[0-9]+,v[0-9]+,v[0-9]+,v0\\.t 3
FAIL: gcc.target/riscv/rvv/autovec/cond/cond_widen_reduc-2.c
scan-assembler-times \\tvwredsumu\\.vs\\tv[0-9]+,v[0-9]+,v[0-9]+,v0\\.t 3
FAIL: gcc.target/riscv/rvv/autovec/cond/cond_widen_reduc-2.c
scan-assembler-times \\tvzext\\.vf4\\tv[0-9]+,v[0-9]+,v0\\.t 2
FAIL: gcc.target/riscv/rvv/autovec/cond/cond_widen_reduc-2.c
scan-assembler-times \\tvzext\\.vf8\\tv[0-9]+,v[0-9]+,v0\\.t 1
FAIL: gcc.target/riscv/rvv/autovec/pr112399.c -O3 -ftree-vectorize 
check-function-bodies foo
FAIL: gcc.target/riscv/rvv/base/pr112431-42.c scan-assembler-not csrr

Relevant postcommit issue:
https://github.com/patrick-rivos/gcc-postcommit-ci/issues/1056

From the precommit: https://github.com/ewlu/gcc-precommit-ci/issues/1669
it looks like this was probably caused by this series:
r15-1005-g0592000aeed Avoid inserting after a GIMPLE_COND with SLP and early
break
r15-1006-gd93353e6423 Do single-lane SLP discovery for reductions

Might just need to update the scans since these are all riscv/* testcases.

[Bug target/115375] [15 Regression] RISCV scan failures since 2024-05-04

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115375

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

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

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yes, I've seen these in the precommit CI, scan-assembler are notoriously
difficult to "adjust" and even analyze.  I left this to risc-v folks assuming
they are fine with this as Richard was fine doing the same for arm.