commit ff12f8b9ae10bf7270ec7ead28a479f6105058eb

Author: Segher Boessenkool <segher@kernel.crashing.org>

Date:   Fri Aug 30 16:17:20 2019 +0200

    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: r275182

--- /dev/null

+++ 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 } } */