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| author | David Hildenbrand <david@redhat.com> | 2019-02-06 10:10:43 +0100 |
|---|---|---|
| committer | Alex Bennée <alex.bennee@linaro.org> | 2019-02-26 14:05:19 +0000 |
| commit | 47393181604d507f4fe2a15a65b1eede0f974d6a (patch) | |
| tree | 77090084212fce6a4f0b8aca8897000e331317c5 /include | |
| parent | 3acf04f8998142a16b91b433d6088a0b25fbcd6e (diff) | |
| download | qemu-47393181604d507f4fe2a15a65b1eede0f974d6a.zip qemu-47393181604d507f4fe2a15a65b1eede0f974d6a.tar.gz qemu-47393181604d507f4fe2a15a65b1eede0f974d6a.tar.bz2 | |
softfloat: add float128_is_{normal,denormal}
Needed on s390x, to test for the data class of a number. So it will
gain soon a user.
A number is considered normal if the exponent is neither 0 nor all 1's.
That can be checked by adding 1 to the exponent, and comparing against
>= 2 after dropping an eventual overflow into the sign bit.
While at it, convert the other floatXX_is_normal functions to use a
similar, less error prone calculation, as suggested by Richard H.
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/fpu/softfloat.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 38a5e99..3ff5215 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -466,7 +466,7 @@ static inline int float32_is_zero_or_denormal(float32 a) static inline bool float32_is_normal(float32 a) { - return ((float32_val(a) + 0x00800000) & 0x7fffffff) >= 0x01000000; + return (((float32_val(a) >> 23) + 1) & 0xff) >= 2; } static inline bool float32_is_denormal(float32 a) @@ -622,7 +622,7 @@ static inline int float64_is_zero_or_denormal(float64 a) static inline bool float64_is_normal(float64 a) { - return ((float64_val(a) + (1ULL << 52)) & -1ULL >> 1) >= 1ULL << 53; + return (((float64_val(a) >> 52) + 1) & 0x7ff) >= 2; } static inline bool float64_is_denormal(float64 a) @@ -940,6 +940,16 @@ static inline int float128_is_zero_or_denormal(float128 a) return (a.high & 0x7fff000000000000LL) == 0; } +static inline bool float128_is_normal(float128 a) +{ + return (((a.high >> 48) + 1) & 0x7fff) >= 2; +} + +static inline bool float128_is_denormal(float128 a) +{ + return float128_is_zero_or_denormal(a) && !float128_is_zero(a); +} + static inline int float128_is_any_nan(float128 a) { return ((a.high >> 48) & 0x7fff) == 0x7fff && |