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author | Peter Maydell <peter.maydell@linaro.org> | 2010-12-07 15:37:34 +0000 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2010-12-07 15:37:34 +0000 |
commit | b408dbdec3d3220b7e2da2b0fd768048f43a2e39 (patch) | |
tree | 790b550113eeaa93bcc7cc28d4ce133ce8f5db08 /fpu/softfloat-specialize.h | |
parent | 09d9487fbb5c17226762e73c2b7d84170f5bd092 (diff) | |
download | qemu-b408dbdec3d3220b7e2da2b0fd768048f43a2e39.tar.gz qemu-b408dbdec3d3220b7e2da2b0fd768048f43a2e39.tar.bz2 qemu-b408dbdec3d3220b7e2da2b0fd768048f43a2e39.zip |
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 <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Diffstat (limited to 'fpu/softfloat-specialize.h')
-rw-r--r-- | fpu/softfloat-specialize.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h index 8e6aceb552..07468786f9 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. |