Hi,

The regression was introduced after we added a new test (rev16_2.c) in https://github.com/gcc-mirror/gcc/commit/bad991a1c5960e90c4686a9362a1258ef29.... The generated code is functionally correct, but the optimization is disabled when -mthumb is equivalent to Thumb1. The fix would not be suitable for stage 4. Instead, I opened a Jira ticket on our side to track the issue and prioritize it. In the meantime, I am going to publish a patch to mark the test as XFAIL when used with thumb1.

Regards, Matthieu

-----Original Message----- From: ci_notify@linaro.org ci_notify@linaro.org Sent: Thursday, February 1, 2024 5:10 PM To: Richard Earnshaw Richard.Earnshaw@arm.com Cc: gcc-regression@gcc.gnu.org; Matthieu Longo Matthieu.Longo@arm.com Subject: [Linaro-TCWG-CI] gcc-14-8499-gbad991a1c59: FAIL: 1 regressions on master-thumb_m0_eabi

Dear contributor, our automatic CI has detected problems related to your patch(es). Please find some details below. If you have any questions, please follow up on linaro-toolchain@lists.linaro.org mailing list, Libera's #linaro-tcwg channel, or ping your favourite Linaro toolchain developer on the usual project channel.

We appreciate that it might be difficult to find the necessary logs or reproduce the issue locally. If you can't get what you need from our CI within minutes, let us know and we will be happy to help.

We track this report status in https://linaro.atlassian.net/browse/GNU-1141 , please let us know if you are looking at the problem and/or when you have a fix.

In arm-eabi cortex-m0 soft after:

| commit gcc-14-8499-gbad991a1c59 | Author: Matthieu Longo matthieu.longo@arm.com | Date: Mon Jan 29 15:54:35 2024 +0000 | | arm: Add pattern for bswap + rotate -> rev16 [Bug 108933] | | The rev16 pattern was not recognised anymore as a change in the bswap | tree pass was introducing a new GIMPLE form, not recognized by the | assembly final transformation pass. | | Also, fix the output patterns for arm_rev16si_alt[12] to correctly | ... 18 lines of the commit log omitted.

FAIL: 1 regressions

regressions.sum: === gcc tests ===

Running gcc:gcc.target/arm/arm.exp ... FAIL: gcc.target/arm/rev16_2.c scan-assembler-times rev16\tr[0-9]+, r[0-9]+ 2

You can find the failure logs in *.log.1.xz files in - https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m0_eabi-bui... The full lists of regressions and progressions as well as configure and make commands are in - https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m0_eabi-bui... The list of [ignored] baseline and flaky failures are in - https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m0_eabi-bui...

The configuration of this build is: CI config tcwg_gnu_embed_check_gcc arm-eabi -mthumb -march=armv6s-m -mtune=cortex-m0 -mfloat-abi=soft -mfpu=auto

-----------------8<--------------------------8<--------------------------8<-------------------------- The information below can be used to reproduce a debug environment:

Current build : https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m0_eabi-bui... Reference build : https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m0_eabi-bui...

Reproduce last good and first bad builds: https://git-us.linaro.org/toolchain/ci/interesting-commits.git/plain/gcc/sha...

Full commit : https://github.com/gcc-mirror/gcc/commit/bad991a1c5960e90c4686a9362a1258ef29...

List of configurations that regressed due to this commit : * tcwg_gnu_embed_check_gcc ** master-thumb_m0_eabi *** FAIL: 1 regressions *** https://git-us.linaro.org/toolchain/ci/interesting-commits.git/plain/gcc/sha... *** https://ci.linaro.org/job/tcwg_gnu_embed_check_gcc--master-thumb_m0_eabi-bui... IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.