https://github.com/philnik777 updated 
https://github.com/llvm/llvm-project/pull/218112

>From aff516a3e11121dc071476264a33982a5009d453 Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <[email protected]>
Date: Sat, 22 Aug 2026 10:12:52 +0200
Subject: [PATCH 1/2] [Clang] Add TimeTraceScopes to DeduceTemplateArguments

---
 clang/lib/Sema/SemaTemplateDeduction.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp 
b/clang/lib/Sema/SemaTemplateDeduction.cpp
index 3c45806c47a6e..e13de97c802b2 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -55,6 +55,7 @@
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/SaveAndRestore.h"
+#include "llvm/Support/TimeProfiler.h"
 #include <algorithm>
 #include <cassert>
 #include <optional>
@@ -4489,6 +4490,10 @@ TemplateDeductionResult Sema::DeduceTemplateArguments(
   if (FunctionTemplate->isInvalidDecl())
     return TemplateDeductionResult::Invalid;
 
+  llvm::TimeTraceScope TimeScope("DeduceTemplateArguments", [&] {
+    return FunctionTemplate->getLocation().printToString(SourceMgr);
+  });
+
   FunctionDecl *Function = FunctionTemplate->getTemplatedDecl();
   unsigned NumParams = Function->getNumParams();
   bool HasExplicitObject = false;
@@ -4772,6 +4777,10 @@ TemplateDeductionResult Sema::DeduceTemplateArguments(
   if (FunctionTemplate->isInvalidDecl())
     return TemplateDeductionResult::Invalid;
 
+  llvm::TimeTraceScope TimeScope("DeduceTemplateArguments", [&] {
+    return FunctionTemplate->getLocation().printToString(SourceMgr);
+  });
+
   FunctionDecl *Function = FunctionTemplate->getTemplatedDecl();
   TemplateParameterList *TemplateParams
     = FunctionTemplate->getTemplateParameters();

>From d5eb098c0348fd7525d9c89865b75a01888c713f Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <[email protected]>
Date: Mon, 24 Aug 2026 09:08:42 +0200
Subject: [PATCH 2/2] Fix test

---
 clang/unittests/Support/TimeProfilerTest.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/clang/unittests/Support/TimeProfilerTest.cpp 
b/clang/unittests/Support/TimeProfilerTest.cpp
index ae6b16a7377d6..a2d68e4b983f4 100644
--- a/clang/unittests/Support/TimeProfilerTest.cpp
+++ b/clang/unittests/Support/TimeProfilerTest.cpp
@@ -406,12 +406,16 @@ ExecuteCompiler
 | | ParseFunctionDefinition (fooA)
 | | ParseDeclarationOrFunctionDefinition (test.cc:3:5)
 | | | ParseFunctionDefinition (user)
+| | | | DeduceTemplateArguments (./a.h:7:10)
 | | | | DeferInstantiation (fooA<int>)
 | PerformPendingInstantiations
 | | InstantiateFunction (fooA<int>, a.h:7)
+| | | DeduceTemplateArguments (./b.h:8:17)
 | | | InstantiateFunction (fooB<int>, b.h:8)
+| | | | DeduceTemplateArguments (./b.h:3:7)
 | | | | DeferInstantiation (fooC<int>)
 | | | | BuildCFG
+| | | DeduceTemplateArguments (./a.h:4:5 <Spelling=<scratch space>:4:1>)
 | | | DeferInstantiation (fooMTA<int>)
 | | | InstantiateFunction (fooC<int>, b.h:3)
 | | | | BuildCFG

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