From 018f6d9f797a49fb5e78f3616fe4f4e9fae35f70 Mon Sep 17 00:00:00 2001
From: Andrew Morrow <acm@mongodb.com>
Date: Sun, 21 Feb 2021 12:37:53 -0500
Subject: [PATCH] SERVER-55131 Add an experiment for enabling -ftree-vectorize
 when optimization is enabled

---
 SConstruct | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/SConstruct b/SConstruct
index 6898453080f..2aea0c8e965 100644
--- a/SConstruct
+++ b/SConstruct
@@ -274,6 +274,7 @@ add_option('opt',
 
 experimental_optimizations = [
     'sandybridge',
+    'treevec',
 ]
 experimental_optimization_choices = ['*']
 experimental_optimization_choices.extend("+" + opt for opt in experimental_optimizations)
@@ -2486,6 +2487,9 @@ if env.TargetOSIs('posix'):
     else:
         env.Append( CCFLAGS=["-O0"] )
 
+    if optBuild and "treevec" in selected_experimental_optimizations:
+        env.Append(CCFLAGS=["-ftree-vectorize"])
+
     # Promote linker warnings into errors. We can't yet do this on OS X because its linker considers
     # noall_load obsolete and warns about it.
     if not has_option("disable-warnings-as-errors"):