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rs6000: New darn testcase (PR91481)

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We used to implement darn with unspecs, not unspec_volatiles, which
means two darn instructions could be CSEd together.

This testcase tests it by adding together four random numbers.  If all
is well that means we get four darn instructions, because such a small
loop is unrolled fine at -O2 already.  If things go bad, combine will
combine it all to one darn and a shift left by two.


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

From-SVN: r274889
This commit is contained in:
Segher Boessenkool 2019-08-24 00:19:40 +02:00 committed by Segher Boessenkool
parent 5857042a2b
commit 457dac4020
2 changed files with 21 additions and 0 deletions
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gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2019-08-23 Segher Boessenkool <segher@kernel.crashing.org>
PR target/91481
* gcc.target/powerpc/darn-3.c: New testcase.
2019-08-23 Marek Polacek <polacek@redhat.com>
PR c++/79817 - attribute deprecated on namespace.

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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 } } */