From 3c4e2dc134c979976ea2e771a13751bc835b6310 Mon Sep 17 00:00:00 2001
From: Bruce Forstall <brucefo@microsoft.com>
Date: Wed, 17 Oct 2018 16:28:29 -0700
Subject: [PATCH] Print Tier-0 or Tier-1 to JIT dump output
 (dotnet/coreclr#20453)

* Print Tier-0 or Tier-1 to JIT dump output

Make it very obvious we've been asked to generate Tier-0 code.

* Print Tier-0 or Tier-1 in assembly output, as appropriate


Commit migrated from https://github.com/dotnet/coreclr/commit/ff467045bc24fcf890ca6f1b58c647cc44b013bd
---
 src/coreclr/src/jit/codegencommon.cpp |  9 +++++++++
 src/coreclr/src/jit/compiler.cpp      | 12 ++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/coreclr/src/jit/codegencommon.cpp b/src/coreclr/src/jit/codegencommon.cpp
index 2a9b5e3..4d908da 100644
--- a/src/coreclr/src/jit/codegencommon.cpp
+++ b/src/coreclr/src/jit/codegencommon.cpp
@@ -2276,6 +2276,15 @@ void CodeGen::genGenerateCode(void** codePtr, ULONG* nativeSizeOfCode)
 
         printf("\n");
 
+        if (compiler->opts.jitFlags->IsSet(JitFlags::JIT_FLAG_TIER0))
+        {
+            printf("; Tier-0 compilation\n");
+        }
+        if (compiler->opts.jitFlags->IsSet(JitFlags::JIT_FLAG_TIER1))
+        {
+            printf("; Tier-1 compilation\n");
+        }
+
         if ((compiler->opts.compFlags & CLFLG_MAXOPT) == CLFLG_MAXOPT)
         {
             printf("; optimized code\n");
diff --git a/src/coreclr/src/jit/compiler.cpp b/src/coreclr/src/jit/compiler.cpp
index c9b7bb9..e11d11f 100644
--- a/src/coreclr/src/jit/compiler.cpp
+++ b/src/coreclr/src/jit/compiler.cpp
@@ -3661,6 +3661,18 @@ void Compiler::compInitOptions(JitFlags* jitFlags)
 
     if (verbose)
     {
+        // If we are compiling for a specific tier, make that very obvious in the output.
+        // Note that we don't expect multiple TIER flags to be set at one time, but there
+        // is nothing preventing that.
+        if (jitFlags->IsSet(JitFlags::JIT_FLAG_TIER0))
+        {
+            printf("OPTIONS: Tier-0 compilation (set COMPlus_TieredCompilation=0 to disable)\n");
+        }
+        if (jitFlags->IsSet(JitFlags::JIT_FLAG_TIER1))
+        {
+            printf("OPTIONS: Tier-1 compilation\n");
+        }
+
         printf("OPTIONS: compCodeOpt = %s\n",
                (opts.compCodeOpt == BLENDED_CODE)
                    ? "BLENDED_CODE"
-- 
2.7.4