[riscv] vec_dup immediate constants in pred_broadcast expand [PR118182]

pr118182-2.c fails on gcc-14 because it lacks the late_combine passes,
particularly the one that runs after register allocation.

Even in the trunk, the predicate broadcast for the add reduction is
expanded and register-allocated as _zvfh, taking up an unneeded scalar
register to hold the constant to be vec_duplicated.

It is the late combine pass after register allocation that substitutes
this unneeded scalar register into the vec_duplicate, resolving to the
_zero or _imm insns.

It's easy enough and more efficient to expand pred_broadcast to the
insns that take the already-duplicated vector constant, when the
operands satisfy the predicates of the _zero or _imm insns.


for  gcc/ChangeLog

	PR target/118182
	* config/riscv/vector.md (@pred_broadcast<mode>): Expand to
	_zero and _imm variants without vec_duplicate.

0 files changed, 0 insertions, 0 deletions