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
