RISC-V: Fix VSETVL PASS regression

This patch is regression fix patch, not an optimization patch.
Since trunk GCC generates redundant vsetvl than GCC-13.

This is the case:

bb 2:
  def a2 (vsetvl a2, zero)
bb 3:
  use a2
bb 4:
  use a2 (vle)

before this patch:

bb 2:
vsetvl a2 zero
bb 3:
vsetvl zero, zero ----> should be eliminated.
bb 4:
vle.v

The root cause is we didn't set bb 3 as transparent since the incorrect codes.
bb 3 didn't modify "a2" just use it, the VSETVL status from bb 2 can be available to bb 3 and bb 4:

bb 2 -> bb 3 -> bb4.

Another regression fix is anticipation calculation:

bb 4:
use a5 (sub)
use a5 (vle)

The vle VSETVL status should be considered as anticipated as long as both sub and vle a5 def are coming from same def.

Tested on zvl128b no regression.

I am going to test on zvl256/zvl512/zvl1024

	PR target/112713

gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc (pre_vsetvl::compute_lcm_local_properties): Fix regression.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/vsetvl/pr112713-1.c: New test.
	* gcc.target/riscv/rvv/vsetvl/pr112713-2.c: New test.

0 files changed, 0 insertions, 0 deletions