From 298b468e4389587ab2e8599dd33eff3fbc698011 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Thu, 10 May 2018 12:45:29 -0700 Subject: fpu/softfloat: Introduce parts_is_snan_frac MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Tested-by: Alex Bennée Reviewed-by: Alex Bennée Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- fpu/softfloat-specialize.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'fpu/softfloat-specialize.h') diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h index 4fc9ea4ac0..515cb12cfa 100644 --- a/fpu/softfloat-specialize.h +++ b/fpu/softfloat-specialize.h @@ -86,6 +86,21 @@ this code that are retained. #define NO_SIGNALING_NANS 1 #endif +/*---------------------------------------------------------------------------- +| For the deconstructed floating-point with fraction FRAC, return true +| if the fraction represents a signalling NaN; otherwise false. +*----------------------------------------------------------------------------*/ + +static bool parts_is_snan_frac(uint64_t frac, float_status *status) +{ +#ifdef NO_SIGNALING_NANS + return false; +#else + flag msb = extract64(frac, DECOMPOSED_BINARY_POINT - 1, 1); + return msb == status->snan_bit_is_one; +#endif +} + /*---------------------------------------------------------------------------- | The pattern for a default generated half-precision NaN. *----------------------------------------------------------------------------*/ -- cgit v1.2.3