From b408dbdec3d3220b7e2da2b0fd768048f43a2e39 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 7 Dec 2010 15:37:34 +0000 Subject: softfloat: Add float*_maybe_silence_nan() functions Add functions float*_maybe_silence_nan() which ensure that a value is not a signaling NaN by turning it into a quiet NaN. Signed-off-by: Peter Maydell Reviewed-by: Nathan Froyd --- fpu/softfloat-specialize.h | 38 ++++++++++++++++++++++++++++++++++++++ fpu/softfloat.h | 2 ++ 2 files changed, 40 insertions(+) (limited to 'fpu') diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h index 8e6aceb..0746878 100644 --- a/fpu/softfloat-specialize.h +++ b/fpu/softfloat-specialize.h @@ -102,6 +102,25 @@ int float32_is_signaling_nan( float32 a_ ) } /*---------------------------------------------------------------------------- +| Returns a quiet NaN if the single-precision floating point value `a' is a +| signaling NaN; otherwise returns `a'. +*----------------------------------------------------------------------------*/ + +float32 float32_maybe_silence_nan( float32 a_ ) +{ + if (float32_is_signaling_nan(a_)) { + uint32_t a = float32_val(a_); +#if SNAN_BIT_IS_ONE + a &= ~(1 << 22); +#else + a |= (1 << 22); +#endif + return make_float32(a); + } + return a_; +} + +/*---------------------------------------------------------------------------- | Returns the result of converting the single-precision floating-point NaN | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid | exception is raised. @@ -234,6 +253,25 @@ int float64_is_signaling_nan( float64 a_ ) } /*---------------------------------------------------------------------------- +| Returns a quiet NaN if the double-precision floating point value `a' is a +| signaling NaN; otherwise returns `a'. +*----------------------------------------------------------------------------*/ + +float64 float64_maybe_silence_nan( float64 a_ ) +{ + if (float64_is_signaling_nan(a_)) { + bits64 a = float64_val(a_); +#if SNAN_BIT_IS_ONE + a &= ~LIT64( 0x0008000000000000 ); +#else + a |= LIT64( 0x0008000000000000 ); +#endif + return make_float64(a); + } + return a_; +} + +/*---------------------------------------------------------------------------- | Returns the result of converting the double-precision floating-point NaN | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid | exception is raised. diff --git a/fpu/softfloat.h b/fpu/softfloat.h index 9bece80..2e651e2 100644 --- a/fpu/softfloat.h +++ b/fpu/softfloat.h @@ -287,6 +287,7 @@ int float32_compare( float32, float32 STATUS_PARAM ); int float32_compare_quiet( float32, float32 STATUS_PARAM ); int float32_is_nan( float32 ); int float32_is_signaling_nan( float32 ); +float32 float32_maybe_silence_nan( float32 ); float32 float32_scalbn( float32, int STATUS_PARAM ); INLINE float32 float32_abs(float32 a) @@ -364,6 +365,7 @@ int float64_compare( float64, float64 STATUS_PARAM ); int float64_compare_quiet( float64, float64 STATUS_PARAM ); int float64_is_nan( float64 a ); int float64_is_signaling_nan( float64 ); +float64 float64_maybe_silence_nan( float64 ); float64 float64_scalbn( float64, int STATUS_PARAM ); INLINE float64 float64_abs(float64 a) -- cgit v1.1