RISC-V: Remove redundant full available computation [NFC]

Notice full available is computed evey round of earliest fusion which is redundant.
Actually we only need to compute it once in phase 3.

It's NFC patch and tested no regression. Committed.

gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc (pre_vsetvl::compute_vsetvl_def_data): Remove
	redundant full available computation.
	(pre_vsetvl::pre_global_vsetvl_info): Ditto.

diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index 53d954e1dff7a9f4d15ee9fed3029ac8a9c91551..72c5a127d9e44c68e439fc2dd0c54f90e839e162 100644 (file)
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -1256,9 +1256,7 @@ public:
   vsetvl_info global_info;
   bb_info *bb;
 
-  bool full_available;
-
-  vsetvl_block_info () : bb (nullptr), full_available (false)
+  vsetvl_block_info () : bb (nullptr)
   {
     local_infos.safe_grow_cleared (0);
     global_info.set_empty ();
@@ -2489,34 +2487,6 @@ pre_vsetvl::compute_vsetvl_def_data ()
        }
     }
 
-  for (const bb_info *bb : crtl->ssa->bbs ())
-    {
-      vsetvl_block_info &block_info = get_block_info (bb);
-      if (block_info.empty_p ())
-       continue;
-      vsetvl_info &curr_info = block_info.get_entry_info ();
-      if (!curr_info.valid_p ())
-       continue;
-
-      unsigned int expr_index;
-      sbitmap_iterator sbi;
-      gcc_assert (
-       !bitmap_empty_p (m_vsetvl_def_in[curr_info.get_bb ()->index ()]));
-      bool full_available = true;
-      EXECUTE_IF_SET_IN_BITMAP (m_vsetvl_def_in[bb->index ()], 0, expr_index,
-                               sbi)
-       {
-         vsetvl_info &prev_info = *m_vsetvl_def_exprs[expr_index];
-         if (!prev_info.valid_p ()
-             || !m_dem.available_p (prev_info, curr_info))
-           {
-             full_available = false;
-             break;
-           }
-       }
-      block_info.full_available = full_available;
-    }
-
   sbitmap_vector_free (def_loc);
   sbitmap_vector_free (m_kill);
 }
@@ -3178,11 +3148,30 @@ pre_vsetvl::pre_global_vsetvl_info ()
   for (const bb_info *bb : crtl->ssa->bbs ())
     {
       vsetvl_block_info &block_info = get_block_info (bb);
-      if (block_info.empty_p () || !block_info.full_available)
+      if (block_info.empty_p ())
+       continue;
+      vsetvl_info &curr_info = block_info.get_entry_info ();
+      if (!curr_info.valid_p ())
        continue;
 
-      vsetvl_info &info = block_info.get_entry_info ();
-      info.set_delete ();
+      unsigned int expr_index;
+      sbitmap_iterator sbi;
+      gcc_assert (
+       !bitmap_empty_p (m_vsetvl_def_in[curr_info.get_bb ()->index ()]));
+      bool full_available = true;
+      EXECUTE_IF_SET_IN_BITMAP (m_vsetvl_def_in[bb->index ()], 0, expr_index,
+                               sbi)
+       {
+         vsetvl_info &prev_info = *m_vsetvl_def_exprs[expr_index];
+         if (!prev_info.valid_p ()
+             || !m_dem.available_p (prev_info, curr_info))
+           {
+             full_available = false;
+             break;
+           }
+       }
+      if (full_available)
+       curr_info.set_delete ();
     }
 
   for (const bb_info *bb : crtl->ssa->bbs ())