https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110796
Bug ID: 110796 Summary: builtin_iseqsig fails some tests in armv8l-linux-gnueabihf Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: thiago.bauermann at linaro dot org CC: fxcoudert at gcc dot gnu.org Target Milestone: --- Target: armv8l-unknown-linux-gnueabihf Commit 34cf27a64e7a "Add __builtin_iseqsig()" introduced the mentioned builtin along with some new tests. Unfortunately they have some failures in armv8l-linux-gnueabihf: Running gcc:gcc.dg/torture/dg-torture.exp ... FAIL: gcc.dg/torture/builtin-iseqsig-1.c -Os execution test FAIL: gcc.dg/torture/builtin-iseqsig-2.c -Os execution test FAIL: gcc.dg/torture/builtin-iseqsig-3.c -Os execution test gcc.log doesn't have any hint on what actually went wrong. E.g.: Executing on host: /home/thiago.bauermann/.cache/builds/gcc-native-aarch32/gcc/xgcc -B/home/thiago.bauermann/.cache/builds/gcc-native-aarch32/gcc/ /home/thiago.bauermann/src/gcc/gcc/testsuite/gcc.dg/torture/builtin-iseqsig-1.c -fdiagnostics-plain-output -Os -fsignaling-nans -lm -o ./builtin-iseqsig-1.exe (timeout = 300) spawn -ignore SIGHUP /home/thiago.bauermann/.cache/builds/gcc-native-aarch32/gcc/xgcc -B/home/thiago.bauermann/.cache/builds/gcc-native-aarch32/gcc/ /home/thiago.bauermann/src/gcc/gcc/testsuite/gcc.dg/torture/builtin-iseqsig-1.c -fdiagnostics-plain-output -Os -fsignaling-nans -lm -o ./builtin-iseqsig-1.exe PASS: gcc.dg/torture/builtin-iseqsig-1.c -Os (test for excess errors) Setting LD_LIBRARY_PATH to :/home/thiago.bauermann/.cache/builds/gcc-native-aarch32/gcc::/home/thiago.bauermann/.cache/builds/gcc-native-aarch32/gcc Execution timeout is: 300 spawn [open ...] FAIL: gcc.dg/torture/builtin-iseqsig-1.c -Os execution test The problem is still present in trunk as of commit 2a3556376c69 "match.pd: Implement missed optimization (~X | Y) ^ X -> ~(X & Y) [PR109986]" from today. Reproduced on Ubuntu 22.04 with: $ ~/src/gcc/configure \ --disable-bootstrap \ --disable-multilib \ --with-mode=thumb \ --with-arch=armv8-a \ --with-float=hard \ --with-fpu=neon-fp-armv8 \ && make -j 60 \ && make -C gcc check-c RUNTESTFLAGS=gcc.dg/torture/dg-torture.exp