[gcc r13-6364] testsuite: Add -fno-ivopts to gcc.dg/Wuse-after-free-2.c, PR108828

[gcc r13-6364] testsuite: Add -fno-ivopts to gcc.dg/Wuse-after-free-2.c, PR108828

[Hans-Peter Nilsson]

https://gcc.gnu.org/g:8c58f4b798177d419c5af37b7e23c490849f2d45

commit r13-6364-g8c58f4b798177d419c5af37b7e23c490849f2d45
Author: Hans-Peter Nilsson <hp@axis.com>
Date:   Fri Feb 24 17:22:02 2023 +0100

    testsuite: Add -fno-ivopts to gcc.dg/Wuse-after-free-2.c, PR108828
    
    For cris-elf before this patch, ever since it was added,
    this test gets:
    
    Running /x/gcc/testsuite/gcc.dg/dg.exp ...
    FAIL: gcc.dg/Wuse-after-free-2.c  (test for warnings, line 115)
    FAIL: gcc.dg/Wuse-after-free-2.c  (test for warnings, line 116)
    
    and comparing tree dumps with a native x86_64-pc-linux-gnu
    run shows a suspicious difference in the "180t.ivopts" dump.
    Indeed -fno-ivopts makes the warning appear for cris-elf
    too.  It was suggested to simply add -fno-ivopts to the
    test-flags, like before -fno-tree-loop-distribute-patterns
    was added; thus.
    
            PR tree-optimization/108828
            * gcc.dg/Wuse-after-free-2.c: Add -fno-ivopts.

Diff:
---
 gcc/testsuite/gcc.dg/Wuse-after-free-2.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/Wuse-after-free-2.c b/gcc/testsuite/gcc.dg/Wuse-after-free-2.c
index 68ec75845ce..ebc051690db 100644
--- a/gcc/testsuite/gcc.dg/Wuse-after-free-2.c
+++ b/gcc/testsuite/gcc.dg/Wuse-after-free-2.c
@@ -1,6 +1,6 @@
 /* PR middle-end/104232 - spurious -Wuse-after-free after conditional free
    { dg-do compile }
-   { dg-options "-O2 -Wall -fno-tree-loop-distribute-patterns" }  */
+   { dg-options "-O2 -Wall -fno-tree-loop-distribute-patterns -fno-ivopts" }  */
 
 void free (void*);
 
@@ -108,7 +108,8 @@ int warn_cond_loop (char *p)
   char *q = p;
 
   /*  -fno-tree-loop-distribute-patterns ensures this does not get converted
-      into rawmemchr (making q and p unrelated).  */
+      into rawmemchr (making q and p unrelated).  Also, -fno-ivopts is required
+      for some targets, to not lose track of the pointer.  */
   while (*q)
     ++q;