[Bug tree-optimization/107608] [13 Regression] Failure on fold-overflow-1.c and pr95115.c

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107608

--- Comment #41 from Richard Biener <rguenth at gcc dot gnu.org> ---
We could fix the testcase with

diff --git a/gcc/testsuite/gcc.dg/pr95115.c b/gcc/testsuite/gcc.dg/pr95115.c
index 69c4f83250c..09273e445d2 100644
--- a/gcc/testsuite/gcc.dg/pr95115.c
+++ b/gcc/testsuite/gcc.dg/pr95115.c
@@ -17,6 +17,7 @@ int
 main (void)
 {
   double r = x ();
+  volatile double rr = r;
   if (!__builtin_isnan (r))
        abort ();
   if (!fetestexcept (FE_INVALID))

that preserves optimizing the isnan check but also preserves the computation
and checks the non-propagation of a NaN.