[Bug c/126244] [RISC-V] wrong-code: dead vsetvli writes VLMAX into a0, clobbering memset destination argument at -O3 with RVV

[christian.herber at oss dot nxp.com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126244

--- Comment #7 from Christian Herber <christian.herber at oss dot nxp.com> ---
try with this exact setup:

FLAGS="-O3 -march=rv64gcv_zba_zbb_zbc_zbs_zvl256b -mrvv-vector-bits=zvl"
cmake .. -DPORT_DIR=ports/riscv/v -DCMAKE_C_FLAGS="$FLAGS"
-DCMAKE_EXE_LINKER_FLAGS="$FLAGS"  -DCMAKE_BUILD_TYPE=RelWithDebInfo
make test_aec_f32 -j$(nproc)
./test_aec_f32