[Linaro-TCWG-CI] gcc-17-4047-ge90e0f66051d: 1 regression on master-thumb_m0_soft_eabi

[ci_notify@linaro.org]

Dear contributor,

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

In  arm-eabi cortex-m0 soft, after:
  | commit gcc-17-4047-ge90e0f66051d
  | Author: Shivam Gupta <shivam98.tkg@gmail.com>
  | Date:   Mon Sep 7 06:36:15 2026 +0530
  | 
  |     tree-optimization: Recognize CLZ loop for signed non-negative values
  |     
  |     is_rshift_by_1 previously checked TYPE_UNSIGNED on the shift statement,
  |     preventing signed arithmetic right shifts from being optimized into CLZ
  |     calls. However, an arithmetic right shift behaves identically to a logical
  | ... 22 lines of the commit log omitted.

Produces 1 regression:
  | 
  | regressions.sum:
  | Running gcc:gcc.dg/tree-ssa/tree-ssa.exp ...
  | FAIL: gcc.dg/tree-ssa/pr125734.c scan-tree-dump-times optimized "\\.CLZ" 1

Used configuration :
 *CI config* tcwg_gnu_embed_check_gcc arm-eabi -mthumb -march=armv6s-m -mtune=cortex-m0 -mfloat-abi=soft -mfpu=auto
 *configure and test flags:* --target arm-eabi --disable-multilib --with-mode=thumb --with-cpu=cortex-m0 --with-float=soft --target_board=-mthumb/-march=armv6s-m/-mtune=cortex-m0/-mfloat-abi=soft/-mfpu=auto qemu_cpu=cortex-m0

We track this bug report under https://linaro.atlassian.net/browse/GNU-2030. (Require Linaro login) Please let us know if you have a fix.

If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list.

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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_m0_soft_eabi-build/builds/10195/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_m0_soft_eabi-build/builds/10195/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_m0_soft_eabi-build/builds/10195/archive/artifacts/sumfiles/xfails.xfail

Current build   : http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m0_soft_eabi-build/builds/10195/archive/artifacts/
Reference build : http://54.172.246.49:9090/jobs/tcwg_gnu_embed_check_gcc--master-thumb_m0_soft_eabi-build/builds/10194/archive/artifacts/

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/e90e0f66051d338c1950d2cc9e36967552d75c3a/tcwg_gnu_embed_check_gcc/master-thumb_m0_soft_eabi/reproduction_instructions.txt

Full commit : See in git+ssh://linaroci@gcc.gnu.org/git/gcc.git