[gcc(refs/users/meissner/heads/work053)] Fix vec-splati-runnable.c test.

[gcc(refs/users/meissner/heads/work053)] Fix vec-splati-runnable.c test.

[Michael Meissner]

https://gcc.gnu.org/g:f0fd2398b057a0c6b5b3d4480f2c7d0ea969c3c5

commit f0fd2398b057a0c6b5b3d4480f2c7d0ea969c3c5
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Mon May 17 21:48:48 2021 -0400

    Fix vec-splati-runnable.c test.
    
    I noticed that the vec-splati-runnable.c did not have an abort after one
    of the tests.  If the test was run with optimization, the optimizer could
    delete some of the tests and throw off the count.
    
    gcc/testsuite/
    2021-05-17  Michael Meissner  <meissner@linux.ibm.com>
    
            * gcc.target/powerpc/vec-splati-runnable.c: Run test with -O2
            optimization.  Do not check what XXSPLTIDP generates if the value
            is undefined.

Diff:
---
 .../gcc.target/powerpc/vec-splati-runnable.c       | 29 +++++++---------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/gcc/testsuite/gcc.target/powerpc/vec-splati-runnable.c b/gcc/testsuite/gcc.target/powerpc/vec-splati-runnable.c
index e84ce77a21d..a135279b1d7 100644
--- a/gcc/testsuite/gcc.target/powerpc/vec-splati-runnable.c
+++ b/gcc/testsuite/gcc.target/powerpc/vec-splati-runnable.c
@@ -1,7 +1,7 @@
 /* { dg-do run { target { power10_hw } } } */
 /* { dg-do link { target { ! power10_hw } } } */
 /* { dg-require-effective-target power10_ok } */
-/* { dg-options "-mdejagnu-cpu=power10 -save-temps" } */
+/* { dg-options "-mdejagnu-cpu=power10 -save-temps -O2" } */
 #include <altivec.h>
 
 #define DEBUG 0
@@ -12,6 +12,8 @@
 
 extern void abort (void);
 
+volatile vector double vresult_d_undefined;
+
 int
 main (int argc, char *argv [])
 {
@@ -85,25 +87,12 @@ main (int argc, char *argv [])
 #endif
   }
 
-  /* This test will generate a "note" to the user that the argument
-     is subnormal.  It is not an error, but results are not defined.  */
-  vresult_d = (vector double) { 2.0, 3.0 };
-  expected_vresult_d = (vector double) { 6.6E-42f, 6.6E-42f };
-
-  vresult_d = vec_splatid (6.6E-42f);
-
-  /* Although the instruction says the results are not defined, it does seem
-     to work, at least on Mambo.  But no guarentees!  */
-  if (!vec_all_eq (vresult_d,  expected_vresult_d)) {
-#if DEBUG
-    printf("ERROR, vec_splati (6.6E-42f)\n");
-    for(i = 0; i < 2; i++)
-      printf(" vresult_d[%i] = %e, expected_vresult_d[%i] = %e\n",
-	     i, vresult_d[i], i, expected_vresult_d[i]);
-#else
-    ;
-#endif
-  }
+  /* This test will generate a "note" to the user that the argument is
+     subnormal.  It is not an error, but results are not defined.  Because this
+     is undefined, we cannot check that any value is correct.  Just store it in
+     a volatile variable so the XXSPLTIDP instruction gets generated and the
+     warning message printed. */
+  vresult_d_undefined = vec_splatid (6.6E-42f);
 
   /* Vector splat immediate */
   vsrc_a_int = (vector int) { 2, 3, 4, 5 };