From 3ae1245ec8fd234fc3f2d0ce1723309728897ee3 Mon Sep 17 00:00:00 2001
From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Fri, 30 Aug 2019 16:25:36 +0200
Subject: [PATCH] backport: re PR target/91481 (POWER9 "DARN" RNG intrinsic
 produces repeated output (CVE-2019-15847))

	Backport from trunk
	2019-08-23  Segher Boessenkool  <segher@kernel.crashing.org>

gcc/testsuite/
	PR target/91481
	* gcc.target/powerpc/darn-3.c: New testcase.

From-SVN: r275186
---
 gcc/testsuite/ChangeLog                   |  8 ++++++++
 gcc/testsuite/gcc.target/powerpc/darn-3.c | 16 ++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/powerpc/darn-3.c

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 8dcdce7a406b..e4634e13ed37 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2019-08-30  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	Backport from trunk
+	2019-08-23  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/91481
+	* gcc.target/powerpc/darn-3.c: New testcase.
+
 2019-08-30  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
diff --git a/gcc/testsuite/gcc.target/powerpc/darn-3.c b/gcc/testsuite/gcc.target/powerpc/darn-3.c
new file mode 100644
index 000000000000..477901fde70d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/darn-3.c
@@ -0,0 +1,16 @@
+/* { dg-do compile { target { powerpc*-*-* } } } */
+/* { dg-skip-if "" { powerpc*-*-aix* } } */
+/* { dg-options "-O2 -mdejagnu-cpu=power9" } */
+
+static int darn32(void) { return __builtin_darn_32(); }
+
+int four(void)
+{
+	int sum = 0;
+	int i;
+	for (i = 0; i < 4; i++)
+		sum += darn32();
+	return sum;
+}
+
+/* { dg-final { scan-assembler-times {(?n)\mdarn .*,0\M} 4 } } */
-- 
2.47.2