aboutsummaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
authorDavid Hildenbrand <david@redhat.com>2019-02-06 10:10:43 +0100
committerAlex Bennée <alex.bennee@linaro.org>2019-02-26 14:05:19 +0000
commit47393181604d507f4fe2a15a65b1eede0f974d6a (patch)
tree77090084212fce6a4f0b8aca8897000e331317c5 /include
parent3acf04f8998142a16b91b433d6088a0b25fbcd6e (diff)
downloadqemu-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.h14
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 &&