[Bug math/30988] fesetexcept raises floating-point exception traps on ppc, ppc64, ppc64le

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30988

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

--- Comment #2 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Indeed, this seems to be an unexpected side-effect of how we implement the GNU
extension feenableexcept and returning an error seems the best option indeed.

Maybe something like:

diff --git a/sysdeps/powerpc/fpu/fesetexcept.c
b/sysdeps/powerpc/fpu/fesetexcept.c
index 609a148a95..e5396daf44 100644
--- a/sysdeps/powerpc/fpu/fesetexcept.c
+++ b/sysdeps/powerpc/fpu/fesetexcept.c
@@ -29,6 +29,10 @@ fesetexcept (int excepts)
         /* Turn FE_INVALID into FE_INVALID_SOFTWARE.  */
         | (excepts >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
            & FE_INVALID_SOFTWARE));
+
+  if (u.l & FPSCR_ENABLES_MASK)
+    return -1;
+
   if (n.l != u.l)
     {
       fesetenv_register (n.fenv);

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