From a87802421a2b472728e958d8d2aa54f19cea67eb Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Tue, 14 Jan 2025 17:36:04 -0600
Subject: [PATCH 1/2] Enable `-split-all-cold` for BOLT

---
 configure    | 2 +-
 configure.ac | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 70581e11b60682..17178c5809a010 100755
--- a/configure
+++ b/configure
@@ -9429,7 +9429,7 @@ printf "%s\n" "$BOLT_INSTRUMENT_FLAGS" >&6; }
 printf %s "checking BOLT_APPLY_FLAGS... " >&6; }
 if test -z "${BOLT_APPLY_FLAGS}"
 then
-  BOLT_APPLY_FLAGS=" ${BOLT_COMMON_FLAGS} -reorder-blocks=ext-tsp -reorder-functions=cdsort -split-functions -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot "
+  BOLT_APPLY_FLAGS=" ${BOLT_COMMON_FLAGS} -reorder-blocks=ext-tsp -reorder-functions=cdsort -split-functions -split-all-cold -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot "
 
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $BOLT_APPLY_FLAGS" >&5
diff --git a/configure.ac b/configure.ac
index d7c3920d049d67..c49b6501bd0192 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2218,6 +2218,7 @@ then
      -reorder-blocks=ext-tsp
      -reorder-functions=cdsort
      -split-functions
+     -split-all-cold
      -icf=1
      -inline-all
      -split-eh

From 0c7711c60c575c0b70e97e50dec9222590db8ca9 Mon Sep 17 00:00:00 2001
From: Zanie Blue <contact@zanie.dev>
Date: Tue, 14 Jan 2025 17:39:25 -0600
Subject: [PATCH 2/2] NEWS

---
 .../next/Build/2025-01-14-17-38-47.gh-issue-128514.K50gQv.rst   | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Build/2025-01-14-17-38-47.gh-issue-128514.K50gQv.rst

diff --git a/Misc/NEWS.d/next/Build/2025-01-14-17-38-47.gh-issue-128514.K50gQv.rst b/Misc/NEWS.d/next/Build/2025-01-14-17-38-47.gh-issue-128514.K50gQv.rst
new file mode 100644
index 00000000000000..0ffb87dd557c77
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2025-01-14-17-38-47.gh-issue-128514.K50gQv.rst
@@ -0,0 +1,2 @@
+Enable ``-split-all-cold`` during BOLT optmizations which outlines as many
+cold basic blocks as possible.