[llvm] [TableGen] Remove unnecessary sorts from writeToStream in InfoByHwMode subclasses. NFC (PR #218977)

[Craig Topper via llvm-commits]

https://github.com/topperc updated https://github.com/llvm/llvm-project/pull/218977

>From ed717cfe62d93e9a8644919147f3b7b22bc042dc Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Wed, 26 Aug 2026 08:43:26 -0700
Subject: [PATCH 1/2] [TableGen] Remove unnecessary sorts from writeToStream in
 InfoByHwMode subclasses. NFC

The underlying map is already sorted by mode, so we can iterate over it.
---
 .../TableGen/Common/CodeGenDAGPatterns.cpp    | 15 ++++---------
 llvm/utils/TableGen/Common/InfoByHwMode.cpp   | 21 +++++--------------
 2 files changed, 9 insertions(+), 27 deletions(-)

diff --git a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
index c695213b5e9e4..9c2513088f7c7 100644
--- a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
@@ -188,21 +188,14 @@ bool TypeSetByHwMode::assign_if(const TypeSetByHwMode &VTS, Predicate P) {
 }
 
 void TypeSetByHwMode::writeToStream(raw_ostream &OS) const {
-  SmallVector<unsigned, 4> Modes;
-  Modes.reserve(Map.size());
-
-  for (const auto &I : *this)
-    Modes.push_back(I.first);
-  if (Modes.empty()) {
+  if (Map.empty()) {
     OS << "{}";
     return;
   }
-  array_pod_sort(Modes.begin(), Modes.end());
-
   OS << '{';
-  for (unsigned M : Modes) {
-    OS << ' ' << getModeName(M) << ':';
-    get(M).writeToStream(OS);
+  for (const auto &P : Map) {
+    OS << ' ' << getModeName(P.first) << ':';
+    P.second.writeToStream(OS);
   }
   OS << " }";
 }
diff --git a/llvm/utils/TableGen/Common/InfoByHwMode.cpp b/llvm/utils/TableGen/Common/InfoByHwMode.cpp
index a666148481d36..70d4b49362120 100644
--- a/llvm/utils/TableGen/Common/InfoByHwMode.cpp
+++ b/llvm/utils/TableGen/Common/InfoByHwMode.cpp
@@ -79,16 +79,11 @@ void ValueTypeByHwMode::writeToStream(raw_ostream &OS) const {
     return;
   }
 
-  std::vector<const PairType *> Pairs;
-  for (const auto &P : Map)
-    Pairs.push_back(&P);
-  llvm::sort(Pairs, deref<std::less<PairType>>());
-
   OS << '{';
   ListSeparator LS(",");
-  for (const PairType *P : Pairs)
-    OS << LS << '(' << getModeName(P->first) << ':'
-       << getMVTName(P->second).str() << ')';
+  for (const auto &P : Map)
+    OS << LS << '(' << getModeName(P.first) << ':' << getMVTName(P.second).str()
+       << ')';
   OS << '}';
 }
 
@@ -167,16 +162,10 @@ bool RegSizeInfoByHwMode::hasStricterSpillThan(
 }
 
 void RegSizeInfoByHwMode::writeToStream(raw_ostream &OS) const {
-  using PairType = decltype(Map)::value_type;
-  std::vector<const PairType *> Pairs;
-  for (const auto &P : Map)
-    Pairs.push_back(&P);
-  llvm::sort(Pairs, deref<std::less<PairType>>());
-
   OS << '{';
   ListSeparator LS(",");
-  for (const PairType *P : Pairs)
-    OS << LS << '(' << getModeName(P->first) << ':' << P->second << ')';
+  for (const auto &P : Map)
+    OS << LS << '(' << getModeName(P.first) << ':' << P.second << ')';
   OS << '}';
 }
 

>From e037b2412acd0aa4bdb35d90d92fee843ceeb983 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Wed, 26 Aug 2026 09:49:30 -0700
Subject: [PATCH 2/2] Apply suggestions from code review

Co-authored-by: Kazu Hirata <kazu at google.com>
---
 llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp | 6 +++---
 llvm/utils/TableGen/Common/InfoByHwMode.cpp       | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
index 9c2513088f7c7..cca943e9c4cad 100644
--- a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
@@ -193,9 +193,9 @@ void TypeSetByHwMode::writeToStream(raw_ostream &OS) const {
     return;
   }
   OS << '{';
-  for (const auto &P : Map) {
-    OS << ' ' << getModeName(P.first) << ':';
-    P.second.writeToStream(OS);
+  for (const auto &[Mode, Types] : Map) {
+    OS << ' ' << getModeName(Mode) << ':';
+    Types.writeToStream(OS);
   }
   OS << " }";
 }
diff --git a/llvm/utils/TableGen/Common/InfoByHwMode.cpp b/llvm/utils/TableGen/Common/InfoByHwMode.cpp
index 70d4b49362120..72caecac7c00f 100644
--- a/llvm/utils/TableGen/Common/InfoByHwMode.cpp
+++ b/llvm/utils/TableGen/Common/InfoByHwMode.cpp
@@ -81,8 +81,8 @@ void ValueTypeByHwMode::writeToStream(raw_ostream &OS) const {
 
   OS << '{';
   ListSeparator LS(",");
-  for (const auto &P : Map)
-    OS << LS << '(' << getModeName(P.first) << ':' << getMVTName(P.second).str()
+  for (const auto &[Mode, VT] : Map)
+    OS << LS << '(' << getModeName(Mode) << ':' << getMVTName(VT).str()
        << ')';
   OS << '}';
 }
@@ -164,8 +164,8 @@ bool RegSizeInfoByHwMode::hasStricterSpillThan(
 void RegSizeInfoByHwMode::writeToStream(raw_ostream &OS) const {
   OS << '{';
   ListSeparator LS(",");
-  for (const auto &P : Map)
-    OS << LS << '(' << getModeName(P.first) << ':' << P.second << ')';
+  for (const auto &[Mode, Info] : Map)
+    OS << LS << '(' << getModeName(Mode) << ':' << Info << ')';
   OS << '}';
 }