[Bug target/111814] on sh4, __builtin_nan* returns signalling NaNs instead of quiet NaNs and vice versa

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111814

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Something like:
```
diff --git a/gcc/config/sh/sh.cc b/gcc/config/sh/sh.cc
index 294faf7c0c3..18fa2129388 100644
--- a/gcc/config/sh/sh.cc
+++ b/gcc/config/sh/sh.cc
@@ -980,6 +980,10 @@ sh_option_override (void)
   if (! OPTION_SET_P (TARGET_IEEE))
     TARGET_IEEE = ! flag_finite_math_only;

+  REAL_MODE_FORMAT (SFmode) = &mips_single_format;
+  REAL_MODE_FORMAT (DFmode) = &mips_double_format;
+
+
   if (sh_fixed_range_str)
     sh_fix_range (sh_fixed_range_str);

```

The mips (real) format here is the basically swapped meaning of the signalling
bit.