[gcc r15-988] pair-fusion: fix for older GCC

[Marc Poulhi?s]

https://gcc.gnu.org/g:5316c35b13cf536bf85eca6eb4b557ddd5d8c201

commit r15-988-g5316c35b13cf536bf85eca6eb4b557ddd5d8c201
Author: Marc Poulhiès <poulhies@adacore.com>
Date:   Mon Jun 3 09:43:52 2024 +0200

    pair-fusion: fix for older GCC
    
    Older GCCs fail with:
    
      .../gcc/pair-fusion.cc: In member function ‘bool pair_fusion_bb_info::fuse_pair(bool, unsigned int, int, rtl_ssa::insn_info*, rtl_ssa::in
      sn_info*, base_cand&, const rtl_ssa::insn_range_info&)’:
      .../gcc/pair-fusion.cc:1790:40: error: ‘writeback’ is not a class, namespace, or enumeration
         if (m_pass->should_handle_writeback (writeback::ALL)
    
    Renaming the enum type works around the name conflict with the local
    variable and also prevents future similar conflicts.
    
    gcc/ChangeLog:
    
            * pair-fusion.h (enum class writeback): Rename to...
            (enum class writeback_type): ...this.
            (struct pair_fusion): Adjust type name after renaming.
            * pair-fusion.cc (pair_fusion_bb_info::track_access): Likewise.
            (pair_fusion_bb_info::fuse_pair): Likewise.
            (pair_fusion::process_block): Likewise.

Diff:
---
 gcc/pair-fusion.cc | 6 +++---
 gcc/pair-fusion.h  | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/gcc/pair-fusion.cc b/gcc/pair-fusion.cc
index 9f897ac04e2..26b2284ed37 100644
--- a/gcc/pair-fusion.cc
+++ b/gcc/pair-fusion.cc
@@ -426,7 +426,7 @@ pair_fusion_bb_info::track_access (insn_info *insn, bool load_p, rtx mem)
     return;
 
   // Ignore writeback accesses if the hook says to do so.
-  if (!m_pass->should_handle_writeback (writeback::EXISTING)
+  if (!m_pass->should_handle_writeback (writeback_type::EXISTING)
       && GET_RTX_CLASS (GET_CODE (XEXP (mem, 0))) == RTX_AUTOINC)
     return;
 
@@ -1787,7 +1787,7 @@ pair_fusion_bb_info::fuse_pair (bool load_p,
   // update of the base register and try and fold it in to make this into a
   // writeback pair.
   insn_info *trailing_add = nullptr;
-  if (m_pass->should_handle_writeback (writeback::ALL)
+  if (m_pass->should_handle_writeback (writeback_type::ALL)
       && !writeback_effect
       && (!load_p || (!refers_to_regno_p (base_regno, base_regno + 1,
 					 XEXP (pats[0], 0), nullptr)
@@ -2996,7 +2996,7 @@ void pair_fusion::process_block (bb_info *bb)
       rtx pat = PATTERN (rti);
       bool load_p;
       if (reload_completed
-	  && should_handle_writeback (writeback::ALL)
+	  && should_handle_writeback (writeback_type::ALL)
 	  && pair_mem_insn_p (rti, load_p))
 	try_promote_writeback (insn, load_p);
 
diff --git a/gcc/pair-fusion.h b/gcc/pair-fusion.h
index 2a38dc8f743..45e4edceecb 100644
--- a/gcc/pair-fusion.h
+++ b/gcc/pair-fusion.h
@@ -75,7 +75,7 @@ struct alias_walker;
 
 // When querying should_handle_writeback, this enum is used to
 // qualify which opportunities we are asking about.
-enum class writeback {
+enum class writeback_type {
   // Only those writeback opportunities that arise from existing
   // auto-increment accesses.
   EXISTING,
@@ -123,7 +123,7 @@ struct pair_fusion {
   // Return true if we should try to handle writeback opportunities.
   // WHICH determines the kinds of writeback opportunities the caller
   // is asking about.
-  virtual bool should_handle_writeback (enum writeback which) = 0;
+  virtual bool should_handle_writeback (writeback_type which) = 0;
 
   // Given BASE_MEM, the mem from the lower candidate access for a pair,
   // and LOAD_P (true if the access is a load), check if we should proceed