From 8c7bb540803e8bff9998bc86806e8a83acc75370 Mon Sep 17 00:00:00 2001
From: Uros Bizjak <ubizjak@gmail.com>
Date: Fri, 24 Jul 2020 15:59:38 +0200
Subject: [PATCH] i386: Emit mfence_sse2 for -Os [PR95750]
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2020-07-24  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:
	PR target/95750
	* config/i386/sync.md (mmem_thread_fence): Emit mfence_sse2 for -Os.
---
 gcc/config/i386/sync.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/config/i386/sync.md b/gcc/config/i386/sync.md
index c88750d..ed17bb0 100644
--- a/gcc/config/i386/sync.md
+++ b/gcc/config/i386/sync.md
@@ -123,7 +123,8 @@
       rtx mem;
 
       if ((TARGET_64BIT || TARGET_SSE2)
-	  && !TARGET_AVOID_MFENCE)
+	  && (optimize_function_for_size_p (cfun)
+	      || !TARGET_AVOID_MFENCE))
 	mfence_insn = gen_mfence_sse2;
       else
 	mfence_insn = gen_mfence_nosse;
-- 
2.7.4