From 32d941139e8144662e0dc182d64e3f3f9df89ad4 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 23 May 2019 13:18:41 +0200
Subject: [PATCH] re PR target/90568 (stack protector should use cmp or sub,
 not xor, to allow macro-fusion on x86)

	PR target/90568
	* config/i386/i386.md (stack_protect_test_<mode>): Use sub instead
	of xor.

From-SVN: r271552
---
 gcc/ChangeLog           | 6 ++++++
 gcc/config/i386/i386.md | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2ccb803d5c6..e49c75847f1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-05-23  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/90568
+	* config/i386/i386.md (stack_protect_test_<mode>): Use sub instead
+	of xor.
+
 2019-05-23  Martin Liska  <mliska@suse.cz>
 
 	PR sanitizer/90570
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index da5163de80e..3fd11e2e4a2 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -19521,7 +19521,7 @@
 		    UNSPEC_SP_TEST))
    (clobber (match_scratch:PTR 3 "=&r"))]
   ""
-  "mov{<imodesuffix>}\t{%1, %3|%3, %1}\;xor{<imodesuffix>}\t{%2, %3|%3, %2}"
+  "mov{<imodesuffix>}\t{%1, %3|%3, %1}\;sub{<imodesuffix>}\t{%2, %3|%3, %2}"
   [(set_attr "type" "multi")])
 
 (define_insn "sse4_2_crc32<mode>"