https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112929
--- Comment #2 from Patrick O'Neill <patrick at rivosinc dot com> --- I tried messing around with it - turns out passing the 'b' variable isn't required: https://godbolt.org/z/EKa15xqYP Using a variadic function reproduces the problem: https://godbolt.org/z/n95sxY1Y8 After recompiling with the new source the behavior persists with any variadic function: > QEMU_CPU=rv64,vlen=128,v=true,vext_spec=v1.0 > /scratch/tc-testing/tc-dec-8-trunk/build-rv64gcv/bin/qemu-riscv64 rv64gc.out m: 5 > QEMU_CPU=rv64,vlen=128,v=true,vext_spec=v1.0 > /scratch/tc-testing/tc-dec-8-trunk/build-rv64gcv/bin/qemu-riscv64 rv64gcv.out m: 0