[Linaro-TCWG-CI] gcc-17-3793-gd8f1bd8c34a: Failure on aarch64

[ci_notify@linaro.org]

Dear contributor,

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

In simplebootstrap_build master-aarch64-bootstrap, after:
  | commit gcc-17-3793-gd8f1bd8c34a
  | Author: Richard Biener <rguenther@suse.de>
  | Date:   Mon Aug 31 14:19:14 2026 +0200
  | 
  |     tree-optimization/126998 - wrong-code with lane-reducing reduction
  |     
  |     The following fixes wrong excess number of lanes computation in
  |     vect_create_constant_vectors, integrating that into
  |     vect_get_num_copies_for_invariant because the poly computation
  | ... 12 lines of the commit log omitted.

Produces Failure:
  | Results changed to
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe bootstrap:
  | # FAILED
  | # First few build errors in logs:
  | # 00:23:05 /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/gcc/tree-vect-slp.cc:8951:16: error: ‘rem’ may be used uninitialized [-Werror=maybe-uninitialized]
  | # 00:23:50 make[3]: *** [Makefile:1219: tree-vect-slp.o] Error 1
  | # 00:23:50 make[2]: *** [Makefile:5182: all-stage2-gcc] Error 2
  | # 00:23:50 make[1]: *** [Makefile:26490: stage2-bubble] Error 2
  | # 00:23:50 make: *** [Makefile:1140: all] Error 2
  | 
  | From
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe bootstrap:
  | 1

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

We track this bug report under https://linaro.atlassian.net/browse/GNU-2014. (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
 * http://54.172.246.49:9090/jobs/tcwg_simplebootstrap_build--master-aarch64-bootstrap-build/builds/10381/archive/artifacts/
The full lists of regressions and improvements as well as configure and make commands are in
 * http://54.172.246.49:9090/jobs/tcwg_simplebootstrap_build--master-aarch64-bootstrap-build/builds/10381/archive/artifacts/notify/

Current build   : http://54.172.246.49:9090/jobs/tcwg_simplebootstrap_build--master-aarch64-bootstrap-build/builds/10381/archive/artifacts/
Reference build : http://54.172.246.49:9090/jobs/tcwg_simplebootstrap_build--master-aarch64-bootstrap-build/builds/10380/archive/artifacts/

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/d8f1bd8c34a289de0810178d897cb246ce2033cf/tcwg_simplebootstrap_build/master-aarch64-bootstrap/reproduction_instructions.txt

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