On 2/4/2026 11:58 AM, Robin Dapp wrote:
Hi,
In riscv_vector_mode_supported_any_target_p we disallow any vector mode
when TARGET_XTHEADVECTOR.
Things go wrong when we check if a permutation for a mode is supported
by just looking at the optab (e.g. in forwprop). Then later we try to
expand that permutation but cannot find a related int vector mode because
we don't allow any vector mode.
Strictly speaking, this is fallout from the simplify_vector_constructor
changes but it's still a target issue as the common code has done the
proper check and we don't live up to the promise of being able to extend
a certain mode.
This patch just allows all modes in
riscv_vector_mode_supported_any_target_p, even for theadvector.
Regtested on rv64gcv_zvl512b.
Regards
Robin
PR target/123971
gcc/ChangeLog:
* config/riscv/riscv.cc (riscv_vector_mode_supported_any_target_p):
Remove TARGET_XTHEADVECTOR.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/xtheadvector/pr123971.c: New test.
OK
jeff
