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Saturating multiplication for int64 was added.

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Vsevolod Livinskij
2014-02-23 19:48:03 +04:00
parent 1f2541fbec
commit af836cda27
5 changed files with 148 additions and 0 deletions
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36
stdlib.ispc
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@@ -4885,6 +4885,28 @@ static inline varying int32 saturating_mul(varying int32 a, varying int32 b) {
return result;
}
static inline uniform int64 saturating_mul(uniform int64 a, uniform int64 b) {
uniform int64 a_abs = (a > 0) ? a : -a;
uniform int64 b_abs = (b > 0) ? b : -b;
if (a_abs > (INT64_MAX / b_abs))
if (((a > 0) && (b > 0)) || ((a < 0) && (b < 0)))
return INT64_MAX;
else
return INT64_MIN;
return a * b;
}
static inline varying int64 saturating_mul(varying int64 a, varying int64 b) {
varying int64 a_abs = (a > 0) ? a : -a;
varying int64 b_abs = (b > 0) ? b : -b;
if (a_abs > (INT64_MAX / b_abs))
if (((a > 0) && (b > 0)) || ((a < 0) && (b < 0)))
return INT64_MAX;
else
return INT64_MIN;
return a * b;
}
static inline uniform unsigned int8 saturating_mul(uniform unsigned int8 a,
uniform unsigned int8 b) {
uniform unsigned int16 result = (uniform unsigned int16) a *
@@ -4938,6 +4960,20 @@ static inline varying unsigned int32 saturating_mul(varying unsigned int32 a,
varying unsigned int32 lo = result;
return lo | - (varying int32) !! hi;
}
static inline uniform unsigned int64 saturating_mul(uniform unsigned int64 a,
uniform unsigned int64 b) {
if (a > (UINT64_MAX / b))
return UINT64_MAX;
return a * b;
}
static inline varying unsigned int64 saturating_mul(varying unsigned int64 a,
varying unsigned int64 b) {
if (a > (UINT64_MAX / b))
return UINT64_MAX;
return a * b;
}
///////////////////////////////////////////////////////////////////////////
// rdrand