vredsum causes deadlock

[ianfield]

Reproducer

vsetvli zero, zero, e32, m1, tu, ma
vwaddu.wv v8, v8, v11
vsetvli a4, zero, e64, m2, ta, ma
vmv.s.x v10, zero
vredsum.vs v8, v8, v10

Steps to Reproduce

git clone https://github.com/ianfield/ara-test.git
cd ara-test/
export LLVM_RISCV=/opt/homebrew/Cellar/llvm/21.1.7/bin/
./sh/checkout.sh
./sh/build.sh --dlen=128
./sh/run.sh --sim spike -k test_vredsum.py
./sh/run.sh --sim fork -k test_vredsum.py
./sh/run.sh --sim base -k test_vredsum.py

Proposed change

valu.sv:790-792

if (is_reduction(vinsn_queue_q.vinsn[vinsn_queue_d.issue_pnt].op)
    && (vinsn_queue_d.issue_cnt != '0)
    && (result_queue_cnt_d == '0)) begin