From: Uros Bizjak <ubizjak@gmail.com>
Date: Tue, 18 Aug 2020 15:34:37 +0000 (+0200)
Subject: i386: Fix restore_stack_nonlocal expander [PR96536].
X-Git-Tag: releases/gcc-10.3.0~1026
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6342cee8801f191466b71116d004e8ccb812caaa;p=thirdparty%2Fgcc.git

i386: Fix restore_stack_nonlocal expander [PR96536].

-fcf-protection code in restore_stack_nonlocal uses a branch based on
a clobber result.  The patch adds missing compare.

2020-08-18  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	PR target/96536
	* config/i386/i386.md (restore_stack_nonlocal):
	Add missing compare RTX.
---

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 292de142e903..44dbb79d008f 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -18696,8 +18696,11 @@
       emit_insn (tmp);
 
       /* Compare and jump over adjustment code.  */
-      noadj_label = gen_label_rtx ();
+      tmp = gen_rtx_COMPARE (CCZmode, reg_ssp, const0_rtx);
       flags = gen_rtx_REG (CCZmode, FLAGS_REG);
+      emit_insn (gen_rtx_SET (flags, tmp));
+
+      noadj_label = gen_label_rtx ();
       tmp = gen_rtx_EQ (VOIDmode, flags, const0_rtx);
       tmp = gen_rtx_IF_THEN_ELSE (VOIDmode, tmp,
 				  gen_rtx_LABEL_REF (VOIDmode, noadj_label),