[gcc(refs/users/meissner/heads/work055)] Fix vec-splati-runnable.c test.

[Michael Meissner <meissner@gcc.gnu.org>]

https://gcc.gnu.org/g:8b620f38d7c9d00226990aa12ec6dcf83cdd82c6

commit 8b620f38d7c9d00226990aa12ec6dcf83cdd82c6
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Wed Jun 9 00:04:13 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.  However, due to the
    fact that the value being loaded in that test is undefined, I did not
    check what value was loaded, but I just stored it into a volatile global
    variable.
    
    gcc/testsuite/
    2021-06-09  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 };