[PATCH] RISC-V: Fix potential ICE of global vsetvl elimination

[Juzhe-Zhong]

Committed for following VSETVL refactor patch to make V2 patch easier to review.
gcc/ChangeLog:

        * config/riscv/riscv-vsetvl.cc 
(pass_vsetvl::global_eliminate_vsetvl_insn): Fix potential ICE.

---
 gcc/config/riscv/riscv-vsetvl.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index ec1aaa4b442..f7558cad2e2 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -4383,7 +4383,7 @@ pass_vsetvl::global_eliminate_vsetvl_insn (const bb_info 
*bb) const
 
   unsigned int bb_index;
   sbitmap_iterator sbi;
-  rtx avl = get_avl (dem.get_insn ()->rtl ());
+  rtx avl = dem.get_avl ();
   hash_set<set_info *> sets
     = get_all_sets (dem.get_avl_source (), true, false, false);
   /* Condition 2: All VL/VTYPE available in are all compatible.  */
@@ -4407,7 +4407,10 @@ pass_vsetvl::global_eliminate_vsetvl_insn (const bb_info 
*bb) const
     {
       sbitmap avout = m_vector_manager->vector_avout[e->src->index];
       if (e->src == ENTRY_BLOCK_PTR_FOR_FN (cfun)
-         || e->src == EXIT_BLOCK_PTR_FOR_FN (cfun) || bitmap_empty_p (avout))
+         || e->src == EXIT_BLOCK_PTR_FOR_FN (cfun)
+         || (unsigned int) e->src->index
+              >= m_vector_manager->vector_block_infos.length ()
+         || bitmap_empty_p (avout))
        return false;
 
       EXECUTE_IF_SET_IN_BITMAP (avout, 0, bb_index, sbi)
-- 
2.36.3