From: Juzhe-Zhong <juzhe.zhong@rivai.ai>
Date: Thu, 25 Jan 2024 08:24:26 +0000 (+0800)
Subject: RISC-V: Remove redundant full available computation [NFC]
X-Git-Tag: basepoints/gcc-15~1721
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5ee45f5e2838caf9180af1702349daa017a032f5;p=thirdparty%2Fgcc.git

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 53d954e1dff7..72c5a127d9e4 100644
--- 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 ())