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backport: re PR target/91481 (POWER9 "DARN" RNG intrinsic produces repeated output (CVE-2019-15847))

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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
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Segher Boessenkool 2019-08-30 16:25:36 +02:00 committed by Segher Boessenkool
parent 7b382b64cb
commit 3ae1245ec8
2 changed files with 24 additions and 0 deletions
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8
gcc/testsuite/ChangeLog
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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

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gcc/testsuite/gcc.target/powerpc/darn-3.c Normal file
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/* { 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 } } */