From 730f2f69ef64858bbb94a29a19d11f0f7f847754 Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Wed, 21 Oct 2026 18:19:29 +0000
Subject: [PATCH] Show LLVM profile statistics after PGO training

---
 Makefile.pre.in | 2 ++
 configure       | 4 ++++
 configure.ac    | 6 ++++++
 3 files changed, 12 insertions(+)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index c49a16f1edc3be..e49c705c9d93db 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -50,6 +50,7 @@ GITBRANCH=	@GITBRANCH@
 PGO_PROF_GEN_FLAG=@PGO_PROF_GEN_FLAG@
 PGO_PROF_USE_FLAG=@PGO_PROF_USE_FLAG@
 LLVM_PROF_MERGER=@LLVM_PROF_MERGER@
+LLVM_PROF_SHOW=@LLVM_PROF_SHOW@
 LLVM_PROF_FILE=@LLVM_PROF_FILE@
 LLVM_PROF_ERR=@LLVM_PROF_ERR@
 DTRACE=         @DTRACE@
@@ -849,6 +850,7 @@ profile-run-stamp:
 	@ # FIXME: can't run for a cross build
 	$(LLVM_PROF_FILE) $(RUNSHARED) ./$(BUILDPYTHON) $(PROFILE_TASK)
 	$(LLVM_PROF_MERGER)
+	$(LLVM_PROF_SHOW)
 	# Remove profile generation binary since we are done with it.
 	$(MAKE) clean-retain-profile
 	# This is an expensive target to build and it does not have proper
diff --git a/configure b/configure
index 38fd8575530e8a..ca780200fdfe9d 100755
--- a/configure
+++ b/configure
@@ -937,6 +937,7 @@ LLVM_PROF_FOUND
 LLVM_PROFDATA
 LLVM_PROF_ERR
 LLVM_PROF_FILE
+LLVM_PROF_SHOW
 LLVM_PROF_MERGER
 PGO_PROF_USE_FLAG
 PGO_PROF_GEN_FLAG
@@ -9163,6 +9164,7 @@ fi
 
 
 
+
 if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}llvm-profdata", so it can be a program name with args.
 set dummy ${ac_tool_prefix}llvm-profdata; ac_word=$2
@@ -9294,6 +9296,7 @@ printf "%s\n" "$as_me: llvm-profdata found via xcrun: ${LLVM_PROFDATA}" >&6;}
   fi
 fi
 LLVM_PROF_ERR=no
+LLVM_PROF_SHOW=true
 
 case "$ac_cv_cc_name" in
   clang|icx)
@@ -9302,6 +9305,7 @@ case "$ac_cv_cc_name" in
     PGO_PROF_USE_FLAG="-fprofile-instr-use=\"\$(shell pwd)/code.profclangd\""
     LLVM_PROF_MERGER=" ${LLVM_PROFDATA} merge -output=\"\$(shell pwd)/code.profclangd\" \"\$(shell pwd)\"/*.profclangr "
     LLVM_PROF_FILE="LLVM_PROFILE_FILE=\"\$(shell pwd)/code-%p.profclangr\""
+    LLVM_PROF_SHOW=" ${LLVM_PROFDATA} show --detailed-summary --topn=500 \"\$(shell pwd)/code.profclangd\" "
     if test $LLVM_PROF_FOUND = not-found
     then
       LLVM_PROF_ERR=yes
diff --git a/configure.ac b/configure.ac
index 777ced94454594..3e317ac1583088 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2099,6 +2099,7 @@ fi
 AC_SUBST([PGO_PROF_GEN_FLAG])
 AC_SUBST([PGO_PROF_USE_FLAG])
 AC_SUBST([LLVM_PROF_MERGER])
+AC_SUBST([LLVM_PROF_SHOW])
 AC_SUBST([LLVM_PROF_FILE])
 AC_SUBST([LLVM_PROF_ERR])
 AC_SUBST([LLVM_PROFDATA])
@@ -2123,6 +2124,7 @@ then
   fi
 fi
 LLVM_PROF_ERR=no
+LLVM_PROF_SHOW=true
 
 case "$ac_cv_cc_name" in
   clang|icx)
@@ -2135,6 +2137,10 @@ case "$ac_cv_cc_name" in
             \"\$(shell pwd)\"/*.profclangr
     ")
     LLVM_PROF_FILE="LLVM_PROFILE_FILE=\"\$(shell pwd)/code-%p.profclangr\""
+    LLVM_PROF_SHOW=m4_normalize("
+        ${LLVM_PROFDATA} show --detailed-summary --topn=500
+            \"\$(shell pwd)/code.profclangd\"
+    ")
     if test $LLVM_PROF_FOUND = not-found
     then
       LLVM_PROF_ERR=yes