Dear contributor,

Our automatic CI has detected problems related to your patch(es). Please find 
some details below.

In gcc_check master-aarch64, after:
  | commit gcc-16-4411-gb6e802fd55d
  | Author: Richard Biener <[email protected]>
  | Date:   Fri Oct 10 14:09:32 2025 +0200
  | 
  |     Rewrite reduction chain handling
  |     
  |     The following moves us (almost) away from REDUC_GROUP_* to recognize
  |     reduction chaings towards making this a SLP discovery artifact.
  |     Reduction chains are now explicitly marked in the reduction info
  | ... 41 lines of the commit log omitted.

Produces 4 regressions:
  | 
  | regressions.sum:
  | Running gcc:gcc.dg/vect/vect.exp ...
  | XPASS: gcc.dg/vect/vect-reduc-dot-s8b.c -flto -ffat-lto-objects  
scan-tree-dump-times vect "vect_recog_dot_prod_pattern: detected(?:(?!Analysis 
failed).)*Analysis succeeded" 1
  | XPASS: gcc.dg/vect/vect-reduc-dot-s8b.c scan-tree-dump-times vect 
"vect_recog_dot_prod_pattern: detected(?:(?!Analysis failed).)*Analysis 
succeeded" 1
  | XPASS: gcc.dg/vect/vect-reduc-pattern-2c.c -flto -ffat-lto-objects  
scan-tree-dump-times vect "vect_recog_widen_sum_pattern: detected" 1
  | XPASS: gcc.dg/vect/vect-reduc-pattern-2c.c scan-tree-dump-times vect 
"vect_recog_widen_sum_pattern: detected" 1

Used configuration :
 *CI config* tcwg_gcc_check master-aarch64
 *configure and test flags:* none, autodetected on aarch64-unknown-linux-gnu

We track this bug report under https://linaro.atlassian.net/browse/GNU-1704. 
Please let us know if you have a fix.

If you have any questions regarding this report, please ask on 
[email protected] mailing list.

-----------------8<--------------------------8<--------------------------8<--------------------------

The information below contains the details of the failures, and the ways to 
reproduce a debug environment:

You can find the failure logs in *.log.1.xz files in
 * 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4246/artifact/artifacts/00-sumfiles/
The full lists of regressions and improvements as well as configure and make 
commands are in
 * 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4246/artifact/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
 * 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4246/artifact/artifacts/sumfiles/xfails.xfail

Current build   : 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4246/artifact/artifacts
Reference build : 
https://ci.linaro.org/job/tcwg_gcc_check--master-aarch64-build/4245/artifact/artifacts

Instruction to reproduce the build : 
https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/b6e802fd55d37e43113fd45a96f7e49cc06fd620/tcwg_gcc_check/master-aarch64/reproduction_instructions.txt

Full commit : See in git+ssh://[email protected]/git/gcc.git

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