From: Richard Sandiford <richard.sandiford@arm.com>
Date: Wed, 1 Feb 2023 09:53:50 +0000 (+0000)
Subject: compare-elim: Fix an RTL checking failure
X-Git-Tag: basepoints/gcc-14~1584
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3cef9dca57ba70576dc387c40e600f00de5d55de;p=thirdparty%2Fgcc.git

compare-elim: Fix an RTL checking failure

find_flags_uses_in_insn used SET_SRC without first checking
for a SET.  This showed up as an RTL checking failure in
g++.dg/torture/pr90994.C on aarch64.

gcc/
	* compare-elim.cc (find_flags_uses_in_insn): Guard use of SET_SRC.
---

diff --git a/gcc/compare-elim.cc b/gcc/compare-elim.cc
index 5cbd2c027b1d..c59dc0cf5a53 100644
--- a/gcc/compare-elim.cc
+++ b/gcc/compare-elim.cc
@@ -254,7 +254,8 @@ find_flags_uses_in_insn (struct comparison *cmp, rtx_insn *insn)
 	x = PATTERN (insn);
 	if (GET_CODE (x) == PARALLEL)
 	  x = XVECEXP (x, 0, 0);
-	x = SET_SRC (x);
+	if (GET_CODE (x) == SET)
+	  x = SET_SRC (x);
 	if (GET_CODE (x) == IF_THEN_ELSE)
 	  x = XEXP (x, 0);
 	if (COMPARISON_P (x)