fpu/softfloat: raise float_invalid for NaN/Inf in round_to_int_and_pack

The re-factor broke the raising of INVALID when NaN/Inf is passed to
the float_to_int conversion functions. round_to_uint_and_pack got this
right for NaN but also missed out the Inf handling.

Fixes https://bugs.launchpad.net/qemu/+bug/1759264Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NBastian Koppelmann <kbastian@mail.uni-paderborn.de>
Tested-by: NBastian Koppelmann <kbastian@mail.uni-paderborn.de>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 20180413140334.26622-3-alex.bennee@linaro.org
Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

fpu/softfloat.c

@@ -1344,8 +1344,10 @@ static int64_t round_to_int_and_pack(FloatParts in, int rmode,
     case float_class_qnan:
     case float_class_dnan:
     case float_class_msnan:
+        s->float_exception_flags = orig_flags | float_flag_invalid;
         return max;
     case float_class_inf:
+        s->float_exception_flags = orig_flags | float_flag_invalid;
         return p.sign ? min : max;
     case float_class_zero:
         return 0;
@@ -1437,6 +1439,7 @@ static uint64_t round_to_uint_and_pack(FloatParts in, int rmode, uint64_t max,
         s->float_exception_flags = orig_flags | float_flag_invalid;
         return max;
     case float_class_inf:
+        s->float_exception_flags = orig_flags | float_flag_invalid;
         return p.sign ? 0 : max;
     case float_class_zero:
         return 0;