Re: [PATCH] RISC-V: fix some vsetvl debug info in pass's Phase 2 code [NFC]

[钟居哲 <juzhe.zhong@rivai.ai>]

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LGTM.



juzhe.zhong@rivai.ai
 
From: Vineet Gupta
Date: 2024-01-17 05:41
To: gcc-patches; Robin Dapp; juzhe . zhong @ rivai . ai
CC: Jeff Law; kito.cheng; gnu-toolchain; Vineet Gupta
Subject: [PATCH] RISC-V: fix some vsetvl debug info in pass's Phase 2 code [NFC]
When staring at VSETVL pass for PR/113429, spotted some minor
improvements.
 
1. For readablity, remove some redundant condition check in Phase 2
   function  earliest_fuse_vsetvl_info ().
2. Add iteration count in debug prints in same function.
 
gcc/ChangeLog:
* config/riscv/riscv-vsetvl.cc (earliest_fuse_vsetvl_info):
Remove redundant checks in else condition for readablity.
(earliest_fuse_vsetvl_info) Print iteration count in debug
prints.
(earliest_fuse_vsetvl_info) Fix misleading vsetvl info
dump details in certain cases.
 
Signed-off-by: Vineet Gupta <vineetg@rivosinc.com>
---
gcc/config/riscv/riscv-vsetvl.cc | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
 
diff --git a/gcc/config/riscv/riscv-vsetvl.cc b/gcc/config/riscv/riscv-vsetvl.cc
index 78a2f7b38faf..41d4b80648f6 100644
--- a/gcc/config/riscv/riscv-vsetvl.cc
+++ b/gcc/config/riscv/riscv-vsetvl.cc
@@ -2343,7 +2343,7 @@ public:
   void compute_lcm_local_properties ();
   void fuse_local_vsetvl_info ();
-  bool earliest_fuse_vsetvl_info ();
+  bool earliest_fuse_vsetvl_info (int iter);
   void pre_global_vsetvl_info ();
   void emit_vsetvl ();
   void cleaup ();
@@ -2961,7 +2961,7 @@ pre_vsetvl::fuse_local_vsetvl_info ()
bool
-pre_vsetvl::earliest_fuse_vsetvl_info ()
+pre_vsetvl::earliest_fuse_vsetvl_info (int iter)
{
   compute_avl_def_data ();
   compute_vsetvl_def_data ();
@@ -2984,7 +2984,8 @@ pre_vsetvl::earliest_fuse_vsetvl_info ()
   if (dump_file && (dump_flags & TDF_DETAILS))
     {
-      fprintf (dump_file, "\n  Compute LCM earliest insert data:\n\n");
+      fprintf (dump_file, "\n  Compute LCM earliest insert data (lift %d):\n\n",
+        iter);
       fprintf (dump_file, "    Expression List (%u):\n", num_exprs);
       for (unsigned i = 0; i < num_exprs; i++)
{
@@ -3032,7 +3033,7 @@ pre_vsetvl::earliest_fuse_vsetvl_info ()
   if (dump_file && (dump_flags & TDF_DETAILS))
     {
-      fprintf (dump_file, "    Fused global info result:\n");
+      fprintf (dump_file, "    Fused global info result (lift %d):\n", iter);
     }
   bool changed = false;
@@ -3142,8 +3143,7 @@ pre_vsetvl::earliest_fuse_vsetvl_info ()
  if (src_block_info.has_info ())
    src_block_info.probability += dest_block_info.probability;
}
-       else if (src_block_info.has_info ()
-        && !m_dem.compatible_p (prev_info, curr_info))
+       else
{
  /* Cancel lift up if probabilities are equal.  */
  if (successors_probability_equal_p (eg->src))
@@ -3151,11 +3151,11 @@ pre_vsetvl::earliest_fuse_vsetvl_info ()
      if (dump_file && (dump_flags & TDF_DETAILS))
{
  fprintf (dump_file,
-    "      Change empty bb %u to from:",
+    "      Reset bb %u:",
   eg->src->index);
  prev_info.dump (dump_file, "        ");
  fprintf (dump_file,
-    "        to (higher probability):");
+    " due to (same probability):");
  curr_info.dump (dump_file, "        ");
}
      src_block_info.set_empty_info ();
@@ -3170,7 +3170,7 @@ pre_vsetvl::earliest_fuse_vsetvl_info ()
      if (dump_file && (dump_flags & TDF_DETAILS))
{
  fprintf (dump_file,
-    "      Change empty bb %u to from:",
+    "      Change bb %u from:",
   eg->src->index);
  prev_info.dump (dump_file, "        ");
  fprintf (dump_file,
@@ -3627,7 +3627,7 @@ pass_vsetvl::lazy_vsetvl ()
     {
       if (dump_file)
fprintf (dump_file, "  Try lift up %d.\n\n", fused_count);
-      changed = pre.earliest_fuse_vsetvl_info ();
+      changed = pre.earliest_fuse_vsetvl_info (fused_count);
       fused_count += 1;
   } while (changed);
-- 
2.34.1