https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128151
Bug ID: 128151
Summary: SIGILL at -O0 -fgnu-tm after cancelling a transaction
that modifies a local struct
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: kyuwoncho18 at gmail dot com
Target Milestone: ---
Target: x86_64-pc-linux-gnu
int main(void)
{
struct { int a; } s = { 1 };
__transaction_atomic {
s.a = 2;
__transaction_cancel;
}
return s.a != 1;
}
godbolt: https://godbolt.org/z/eefsdYYjv
The transaction is unconditionally cancelled, so the assignment to s.a must be
rolled back and main must return 0. On x86-64, -O0 -fgnu-tm terminates with
SIGILL (exit status 132), whereas -O1, -O2, -O3 and -Os with -fgnu-tm exit
normally with status 0.
