Dear contributor,

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

In  arm-eabi cortex-m23 soft, after:
  | commit gcc-16-6976-gbadd64289a4
  | Author: Robin Dapp <[email protected]>
  | Date:   Wed Jan 21 08:20:48 2026 +0100
  | 
  |     forwprop: More nop-conversion handling [PR123731].
  |     
  |     Since relaxing the constraints for permutes in r16-6671 for simplifying
  |     vector constructors there is an additional case to be handled as it
  |     interacts with r16-5561 (that allows nop conversions).
  | ... 36 lines of the commit log omitted.

Produces 4 regressions:
  | 
  | regressions.sum:
  | Running gcc:gcc.dg/vect/vect.exp ...
  | FAIL: gcc.dg/vect/pr123731.c (test for excess errors)
  | FAIL: gcc.dg/vect/pr123731.c -flto -ffat-lto-objects (test for excess 
errors)
  | UNRESOLVED: gcc.dg/vect/pr123731.c -flto -ffat-lto-objects compilation 
failed to produce executable
  | UNRESOLVED: gcc.dg/vect/pr123731.c compilation failed to produce executable

Used configuration :
 *CI config* tcwg_gnu_embed_check_gcc arm-eabi -mthumb -march=armv8-m.base 
-mtune=cortex-m23 -mfloat-abi=soft -mfpu=auto
 *configure and test flags:* --target arm-eabi --disable-multilib 
--with-mode=thumb --with-cpu=cortex-m23 --with-float=soft 
--target_board=-mthumb/-march=armv8-m.base/-mtune=cortex-m23/-mfloat-abi=soft/-mfpu=auto
 qemu_cpu=cortex-m33

We track this bug report under https://linaro.atlassian.net/browse/GNU-1890. 
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
 * 
http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m23_soft_eabi-build/builds/10046/archive/artifacts/00-sumfiles/
The full lists of regressions and improvements as well as configure and make 
commands are in
 * 
http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m23_soft_eabi-build/builds/10046/archive/artifacts/notify/
The list of [ignored] baseline and flaky failures are in
 * 
http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m23_soft_eabi-build/builds/10046/archive/artifacts/sumfiles/xfails.xfail

Current build   : 
http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m23_soft_eabi-build/builds/10046/archive/artifacts/
Reference build : 
http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m23_soft_eabi-build/builds/10045/archive/artifacts/

Instruction to reproduce the build : 
https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/badd64289a496c0fdb50f39fc2edeb4d124a8d0d/tcwg_gnu_embed_check_gcc/master-thumb_m23_soft_eabi/reproduction_instructions.txt

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

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