[Linaro-TCWG-CI] gcc-16-6333-gac64ceb33bf: Failure on aarch64

Dear contributor,

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

In  master-aarch64, after:
  | commit gcc-16-6333-gac64ceb33bf
  | Author: Vineet Gupta <[email protected]>
  | Date:   Mon Dec 22 08:54:10 2025 -0800
  | 
  |     ifcvt: cond zero arith: handle subreg for shift count
  |     
  |     Some backends, RISC-V included, wrap shift counts in subreg which
  |     current cond zero arith wasn't handling.
  |     
  | ... 13 lines of the commit log omitted.

Produces Failure:
  | Results changed to
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe binutils:
  | 1
  | # build_abe stage1 --:
  | 2
  | # build_abe linux:
  | 3
  | # build_abe glibc:
  | 4
  | # build_abe stage2 --:
  | # FAILED
  | # build_abe gdb:
  | # build_abe qemu:
  | # First few build errors in logs:
  | # 00:08:55 /home/tcwg-buildslave/workspace/tcwg_gnu_0/abe/snapshots/gcc.git~master/libstdc++-v3/src/c++20/tzdb.cc:610:7: internal compiler error: in maybe_legitimize_operand, at optabs.cc:8248
  | # 00:08:56 make[5]: *** [Makefile:757: tzdb.lo] Error 1
  | # 00:08:56 make[4]: *** [Makefile:800: all-recursive] Error 1
  | # 00:08:56 make[3]: *** [Makefile:580: all-recursive] Error 1
  | # 00:08:56 make[2]: *** [Makefile:505: all] Error 2
  | # 00:08:56 make[1]: *** [Makefile:12319: all-target-libstdc++-v3] Error 2
  | # 00:08:56 make: *** [Makefile:1089: all] Error 2
  | 
  | From
  | # reset_artifacts:
  | -10
  | # true:
  | 0
  | # build_abe binutils:
  | 1
  | # build_abe stage1 --:
  | 2
  | # build_abe linux:
  | 3
  | # build_abe glibc:
  | 4
  | # build_abe stage2 --:
  | 5
  | # build_abe gdb:
  | 6
  | # build_abe qemu:
  | 7

Used configuration :
 *CI config* tcwg_gnu_cross_build master-aarch64
 *configure and test flags:* --target aarch64-linux-gnu 

We track this bug report under https://linaro.atlassian.net/browse/GNU-1790. 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
 * https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-build/1366/artifact/artifacts/
The full lists of regressions and improvements as well as configure and make commands are in
 * https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-build/1366/artifact/artifacts/notify/

Current build   : https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-build/1366/artifact/artifacts
Reference build : https://ci.linaro.org/job/tcwg_gnu_cross_build--master-aarch64-build/1365/artifact/artifacts

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/gcc/sha1/ac64ceb33bf05b69d4ab05a383d94652f1b5d0ca/tcwg_gnu_cross_build/master-aarch64/reproduction_instructions.txt

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